Answer:
Because they don’t happen every month, a lunar eclipse is a special event. Unlike solar eclipses, lots of people get to see each lunar eclipse. If you live on the nighttime half of Earth when the eclipse happens, you’ll be able to see it. Remembering the Difference. It’s easy to get these two types of eclipses mixed up.
Explanation:
Final answer:
Multiple factors, including visibility, atmospheric conditions, and Earth's shadow, can cause each lunar eclipse to look different.
Explanation:
A lunar eclipse can look different each time due to several factors:
Visibility: Depending on the position of the Moon, its distance from the Earth, and the Earth's location in its orbit, the lunar eclipse may appear more or less visible. This can result in variations in brightness and coloring.Atmospheric Conditions: Weather conditions, such as clouds or pollution, can affect the appearance of a lunar eclipse. These factors can cause the Moon to appear dimmer or alter the color during an eclipse.Earth's Shadow: The angle at which the Moon enters the Earth's shadow can also influence the appearance. Different angles can result in varying degrees of darkness and shading on the lunar surface.These factors combined contribute to the unique appearance of each lunar eclipse, making each one a distinct astronomical event.
A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?
He is incorrect, because water can dissolve ionic solids.
The test proves nothing, because water dissolves all solids.
He is correct, because polar liquids cannot dissolve ionic solids.
The test proves nothing, because it only shows that the solid is a compound.
The correct evaluation of the student's reasoning is: He is incorrect, because water can dissolve ionic solids.
To evaluate the solubility of a solid in water as a means of determining its ionic nature, one must consider the interactions between the solid and the water molecules. Water is a polar solvent, meaning it has a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. This polarity allows water to solvate ions by surrounding cations with its oxygen side and anions with its hydrogen side. As a result, water can often dissolve ionic compounds by breaking the ionic bonds and stabilizing the individual ions in solution.
However, the solubility of ionic compounds in water is not solely dependent on their ionic nature. It also depends on the lattice energy of the solid and the hydration energy of the ions. Some ionic compounds have very high lattice energies, meaning the ions are held together very strongly in the solid state, which can prevent them from dissolving in water if the hydration energies are not sufficient to overcome the lattice energy.
Therefore, the student's conclusion that the solid is not ionic simply because it does not dissolve in water is incorrect. The inability of the solid to dissolve could be due to a high lattice energy rather than the absence of an ionic bond. To truly determine the nature of the solid, additional tests such as checking for conductivity when the solid is dissolved in other solvents or performing a flame test would be necessary.
The other options can be evaluated as follows:
- The test proves nothing, because water dissolves all solids: This statement is incorrect because not all solids dissolve in water. There are many examples of covalent solids that do not dissolve in water.
- He is correct, because polar liquids cannot dissolve ionic solids: This statement is incorrect because polar liquids like water can dissolve ionic solids, provided that the hydration energies are sufficient to overcome the lattice energy.
- The test proves nothing, because it only shows that the solid is a compound: This statement is partially correct in that the test alone does not prove the solid is ionic or covalent. However, it is misleading to say that the test only shows that the solid is a compound, as the test does not provide information about the compound's bonding nature.
In conclusion, the student's reasoning is flawed because the insolubility of a solid in water does not conclusively prove that the solid is not ionic. Further tests are required to determine the nature of the solid's chemical bonding.
The frequency of a tornado siren is 1,000 Hz. If a cyclist is moving toward the siren at 10 m/s in 15 °C air, which has a speed of sound of 340 m/s, what is the frequency that the cyclist observes?
Answer:
The frequency the cyclist observes is 1029.412 Hz
Explanation:
Here we have that the frequency is given by the relation;
[tex]f_{obs} = f_{source}\left (\frac{v \pm v_{obs}}{v \pm v_{source}} \right )[/tex]
Where:
[tex]f_{obs}[/tex] = Frequency sensed by the observer
[tex]f_{source}[/tex] = Frequency emitted by the source = 1,000 Hz
v = Velocity of sound in air
[tex]v_{obs}[/tex] = Speed of observer = + 10 m/s
[tex]v_{source}[/tex] = Speed of source = 0 m/s
Plugging in the values, we have;
[tex]f_{obs} =1000 \times \left (\frac{340 + 10}{340 + 0} \right ) = 1000 \times \left (\frac{350}{340 } \right ) = 1029.412 \ Hz[/tex]
Therefore, the frequency the cyclist observes = 1029.412 Hz.
The phenomenon described in the question is known as the Doppler Effect, used to explain why a moving observer perceives a change in frequency. Given the conditions in the problem, the cyclist would perceive the siren's frequency to be approximately 1029.4 Hz instead of 1000 Hz.
Explanation:The phenomenon described in the question relates to the Doppler Effect, which involves a change in frequency of a wave (in this case, sound) due to the relative motion between the source of the wave and the observer.
When the observer is moving towards the source of a sound, the frequency they perceive is higher than the actual frequency of the sound. This perceived frequency (f') can be calculated using the formula:
f' = f * (v + vo) / v
Where: f is the actual frequency, v is the speed of sound, and vo is the speed of the observer (cyclist).
Substituting the given values:
f' = 1000 Hz * (340 m/s + 10 m/s) / 340 m/s = 1029.4 Hz
Therefore, the cyclist will observe a frequency of approximately 1029.4 Hz.
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A heat pump is to be used for heating a house in winter. The house is to be maintained at 70°F at all times. When the temperature outdoors drops to 40°F, the heat losses from the house are estimated to be 75,000 Btu/h. Determine the minimum power [Btu/h] required to run this heat pump if heat is extracted from the outdoor air at 40°F.
Answer:
[tex]\dot{W_{H} } = 4244.48 Btu/h[/tex]
Explanation:
Temperature of the house, [tex]T_{H} = 70^{0} F[/tex]
Convert to rankine, [tex]T_{H} = 70^{0}+ 460 = 530 R[/tex]
Heat is extracted at 40°F i.e [tex]T_{L} = 40^{0}F = 40 + 460 = 500 R[/tex]
Calculate the coefficient of performance of the heat pump, COP
[tex]COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67[/tex]
The minimum power required to run the heat pump is given by the formula:
[tex]\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\[/tex]...............(*)
Where the heat losses from the house, [tex]\dot{Q_{H} } = 75,000 Btu/h[/tex]
Substituting these values into * above
[tex]\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h[/tex]
What does it mean when energy is conserved? How are energy and work related? What are the two basic types of energy and how are they related?
kenetic and potential
A ray in glass arrives at the glass-water interface at an angle of 48° with the normal. The refracted ray, in water, makes a 72° angle with the normal. The index of refraction of water is 1.33. Then the ray in glass is redirected so its new angle of incidence is 37°. What is the new angle of refraction in the water? Show all work. (2 points)
An electromagnetic wave of frequency 2.30 × 10^14 Hz propagates in carbon tetrachloride with a speed of 2.05 x 10^8 m/s. What is the wavelength of the wave in carbon tetrachloride? Show all work and include units of measure. (2 points)
Based on the data in the graph provided, which value is closest to the index of refraction of quartz for extreme violet light of wavelength 400 nm? (1 point)
1.44
1.53
1.56
1.67
The index of refraction of medium 1 is 2.3 and the index of refraction for medium 2 is 1.6. What is the critical angle for light traveling within medium 1 toward medium 2? (1 point)
40°
14°
44°
70°
A ray of laser light strikes a glass surface at an angle θa = 22.5° to the normal. What is the angle θb of the refracted ray? Let the index of refraction for glass nb = 1.77. (1 point)
12.7°
12.5°
31.8°
10.1°
As explained by the theory of quantum electrodynamics, light is best described as _____. (1 point)
Both a wave and particles.
A wave, not particles.
Particles, not a wave.
Match the following types of electromagnetic waves with where they exist on the electromagnetic spectrum. (2 points)
1
2
3
4
a. Radio Waves
b. Infrared
c. Gamma Rays
d. X-Rays
Describe the difference(s) between electromagnetic waves and mechanical waves. Provide an example of each in your descriptions. (2 points)
A step-down transformer providing electricity for a residential neighborhood has exactly 2750 turns in its primary. When the potential difference across the primary is 5670 V, the potential difference at the secondary is 240 V. How many turns are in the secondary? Show all work. (2 points)
A circuit has 3 resistors, all connected in parallel. Let R1 = 4.0 Ω, R2 = 3.0 Ω, and R3 = 6.0 Ω. What is the equivalent resistance of the circuit? Show all work and include units of measure.
Answer:
hope this helps
...........
A note on a piano vibrates 262 time per second. What is the period of the wave
Answer: it is period 93
Explanation:
The period of a wave, measured in seconds, is the reciprocal of its frequency. Given that a piano note vibrates at a frequency of 262 times per second, the period of the wave is approximately 1/262 or 0.00381 seconds.
Explanation:In physics, the frequency is the number of waves that pass a fixed point in a given time period. We typically measure it in hertz (Hz), which is synonymous with cycles per second. On the other hand, the period is the duration it takes for one cycle to pass, which is the reciprocal of the frequency.
Here the note on the piano is stated to vibrate (frequency) 262 times per second. Thus, to calculate the period, we take the reciprocal of the frequency i.e. 1 divided by the frequency. Hence, it's 1/262 which equals approximately 0.00381 seconds. So, the period is about 0.00381 seconds.
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Along a horizontal line, from left, a point, a large giraffe labeled Object, a small giraffe labeled Image, a double concave lens centered on the line, another point on the line. A dotted orange line passes up and right through the first point, goes to the head of the large giraffe, turns solid, and passes through the lens to the label 2. A shorter orange line passes straight from the top of the large giraffe to the center of the lens. A Dotted green line runs straight from the left through the neck of the larger giraffe through the lens to a label 3 on the right side. A shorter green line runs from the top of the larger giraffe to the center of the top half of the lens and then as a dotted line to the second point. A solid blue line runs from the top of the large giraffe through the center of the lens to a label 1 right of and below the lens. In the diagram, the shape of the lens is and the image is .
Answer:
In the diagram, the shape of the lens is concave and the image is virtual
Explanation:
yes
Answer:
concave and virtual
Explanation:
Explanation:
At one instant an electron is moving in the positive x direction along the x axis in a region where there is a uniform magnetic field in the positive z direction. When viewed from a point on the positive z axis, it subsequent motion is:
When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.
The motion of charged particles like electrons in a magnetic field is governed by the Lorentz force equation:
F = q * (v x B)
where:
F is the magnetic force acting on the electron,
q is the charge of the electron,
v is the velocity of the electron,
B is the magnetic field vector.
Since the velocity of the electron (v) is in the positive x-direction, and the magnetic field (B) is in the positive z-direction, the cross product (v x B) will result in a force perpendicular to both the x and z axes. This force causes the electron to move in a circular path around the z-axis.
This motion is commonly referred to as circular motion in a magnetic field, and it is similar to the way charged particles move in a cyclotron or a particle accelerator. The electron will continue to move in this circular path as long as it remains in the region with the uniform magnetic field and no other forces act on it.
Hence, When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.
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Six friends are at a pizzeria. They want to order enough pizza so that each person can eat at least 2/5 . start fraction, 2, divided by, 5, end fraction of a pizza. What is the minimum number of pizzas they should order?
Friend #1 gets at least 2/5 of a pizza.
Friend #2 gets at least 2/5 .
Friend #3 gets at least 2/5 .
Friend #4 gets at least 2/5 .
Friend #5 gets at least 2/5 .
Friend #6 gets at least 2/5 .
Sum . . . . . . . . . at least 12/5 of a pizza.
Simplify . . . . . . at least 2.4 pizzas.
-- If pizzas can be bought by the half, they should order at least 2-1/2 pizzas.
-- If only whole pizzas have to be ordered, then they should order at least 3 pizzas.
Answer:
3 pizza if your in khan! :D
Explanation:
Why is the weight of an object more on Earth than the Moon
Answer:
Due to gravity on the earth but on moon there is 1/6th of the gravity than on earth. Since the acceleration of gravity Is lesser in moon and weight is constant, the weight of an object is lesser on the surface of the moon.
Explanation:
Answer: C.
The gravitational pull of Earth is greater than that of the Moon.
Explanation: plato
A wheel is used to turn a valve stem on a water valve. The wheel radius is 4 inches and the axle radius is .25 inches.
a)What is the mechanical advantage of the wheel and axle?
b)How much resistance force can be overcome when an effort of 6 lbs is applied to the wheel of the water valve in this problem?
Answer:
a) Mechanical advantage of the wheel and axle is 16b) The resistance force that can be overcomed with the effort is 96lbsExplanation:
Mechanical Advantage of a wheel and axle is defined as the ratio of the load on the axle to the effort applied on the wheel. It can also be described as the ratio of the radius of the wheel (larger radius) to the radius of the axle (smaller radius).
Mechanical advantage = Load/ Effort = R/r
Given the wheel radius as 4 inches and the axle radius as 0.25 inches.
MA = R/r = 4/0.25
MA = 16
Mechanical advantage of the wheel and axle is 16
b) Using the formula Mechanical Advantage = Load/ Effort
Given MA = 16, Effort = 16lbs, Load =?
On substitution, 16 = Load/6
Load = 16*6
Load = 96lbs
The resistance force that can be overcomed with the effort is 96lbs
Which phase of the moon will occur after "waning gibbous"?
A. full moon
B. last quarter
C. waning crescent
D. new moon
E. waxing crescent
F. first quarter
G. waxing gibbous
Answer: B. The last quarter. Half of the moon's surface will be visibly illuminated.
Answer:
B. Last Quarter
You used the right-hand rule to determine the z component of the angular momentum, but as a check, calculate in terms of position and momentum: what is xpy? what is ypx? therefore, what is the z component of the angular momentum of the child about location a?
In the case of x py, L is in the positive z-direction.
In the case of y px L the negative z-direction.
What is Angular momentum?
When The angular amount is defined by the relation
Then L = r x p
Then the bold are vectors, where r is the position vector and p is the linear amount vector.
When The module of this vector can be concentrated by the relation
After that L = r p sin θ
Although the direction of the vector L can be found by the right-hand rule where the thumb pinpoints in the direction of the displacement vector, When the fingers extended in the direction of the moment p which is the exact direction of speed, and also the palm ends in the direction of the angular momentum L
In the case x py
the thumb is in the x-direction, Then the fingers are extended in the direction, and also the palm is in the positive z-direction
In such the case y px
Therefore, the thumb is in the y-direction, the fingers are in the x-direction, the palm is in the negative z-direction
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The z-component of angular momentum can be found using the cross product of the position and momentum vectors. The formula Lz = xpy - ypx expresses this component, where x and y are position coordinates along the x and y axes, respectively, and px and py are the momentum components along those axes.
Explanation:The angular momentum L of a particle with respect to a point can be calculated as the cross product of the particle's position vector r and its linear momentum p. If we take x to be the position along the x-axis and py to be the component of the momentum along the y-axis, then xpy would represent the contribution of these components to the angular momentum around the z-axis. Similarly, if y is the position along the y-axis and px is the component of momentum along the x-axis, then ypx is also a contribution to the angular momentum around the z-axis.
However, according to the right-hand rule for cross products, the z-component of the angular momentum calculated from these components would be Lz = xpy - ypx, since the cross product is defined as r x p = (ypx - xpy)k, where k is the unit vector in the z-direction.
What is the difference between internal hardware and software?
Internal hardware is the physical parts of a computer that you see on the outside; software is the physical parts of a computer that you see on the inside.
Internal hardware is the physical parts of a computer that you see inside the computer; software is the physical parts of a computer that you see on the outside.
Internal hardware is the programs and applications that make the computer work; software is the physical parts that help the computer work.
Internal hardware is physical parts that help the computer work; software is the programs and applications that make the computer work.
Answer:
Internal hardware is physical parts that help the computer work; software is the programs and applications that make the computer work.
Explanation:
Credit to the guy above me
The difference between internal hardware and software lies in their physical nature and functions within a computer system. Internal hardware refers to the tangible components of a computer, while software consists of the programs and applications that enable the computer to perform tasks.
The difference between internal hardware and software lies in their physical nature and functions within a computer system. Internal hardware refers to the tangible components of a computer, such as the motherboard, processor, memory, and storage devices, that are housed inside the computer's casing. These components work together to enable the computer to perform tasks.
On the other hand, software refers to the intangible programs and applications that are installed on the computer and instruct the hardware on how to perform specific tasks.
For example, the operating system (e.g., Windows, macOS, Linux) is a type of software that manages and controls the computer's hardware, allowing users to interact with the computer and run other software applications.
Applications like word processors, web browsers, and media players are also examples of software that users can install and use on their computers.
In summary, internal hardware comprises the physical components of a computer, while software consists of the programs and applications that enable the computer to perform tasks.
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Which therapy is associated with light, but not sound?
A: breaking down kidney stones
B: acoustically targeting the delivery of a drug
C: cauterizing an incision or wound
D: ablating tumors
Cauterizing an incision or wound is associated with light, but not sound.
What is Cauterization?This is a medical procedure which involves burning a part of a body to remove or close off a part of it.
It is usually done with the use of hot iron, electricity etc which makes it associated with light and not sound.
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True or Flase The fastest moving traffic on the expressway will be traveling in the right lane
I think this answer is False because i believe the right lane is the slowest lane you could be in.
The statement that the fastest moving traffic on the expressway is in the right lane is false. Slower traffic typically occupies the right lane, while faster traffic uses the left lanes. The right lane is generally for slower vehicles or those preparing to exit.
The statement "The fastest moving traffic on the expressway will be traveling in the right lane" is False. Typically, on an expressway or freeway, the right lane is designated for slower-moving traffic or for vehicles that are about to exit. The left lane is generally used for passing and faster-moving traffic.
For example, if you are driving at 60 mph in the right lane and another car is driving at 65 mph, that car will most likely be in the left lane to pass you. Therefore, the fastest-moving traffic will be found in the left lanes rather than the right lanes.
Which factors affect the resistance of a material? Check all that apply.
length
currer
thickness
temperature
voltage
Answer: Length, thickness, and temperature
Explanation:
I did it
Resistance of a material is affected by its length, thickness, temperature, and type of material; voltage does not determine resistance.
Explanation:The factors that affect the resistance of a material include the length of the resistor, thickness of the resistor, the temperature of the conductor, and the type of material. Length affects resistance because the longer a conductor, the more collisions charges will make with its atoms, increasing resistance. The thickness of a resistor affects resistance inversely; a thicker conductor has a greater cross-sectional area, allowing more current to flow and decreasing resistance.
The temperature affects resistance because as a conductor gets hotter, the atoms vibrate faster, increasing kinetic energy and making it more difficult for the electric current to flow. Different materials also have different inherent resistances due to their atomic structures. Voltage does not affect resistance; rather, resistance determines how much voltage is required to drive a certain current through a conductor.
Danielle has a mass of 80 kg and is sitting in a wagon at the top of a 20-m high hill. She slides down. a) How much kinetic energy will she have at the bottom of the hill?
Answer:
E = 15680 J
Explanation:
We have,
Mass of Danielle is 80 kg
He is at the top of hill at a height of 20 m
As she slides down at the bottom of the hill, its potential energy gets converted to its kinetic energy. So, the kinetic energy at the bottom of the hill is :
[tex]E=mgh\\\\E=80\times 9.8\times 20\\\\E=15680\ J[/tex]
So, she will have 15680 J of kinetic energy at the bottom of the hill.
how does the current in a resistor change if the voltage across the resistor is decreased by 4
According to Ohm's law, if the voltage across a resistor is decreased, the current flowing through it will decrease proportionally. This is because the current is directly proportional to the voltage while the resistance remains constant.
Explanation:The change in current flowing through a resistor, when the voltage across the resistor is decreased, can be explained using Ohm's law. According to Ohm's law, the voltage (V) across a resistor is equal to the product of the current (I) that passes through it and its resistance (R). The relationship is given by the formula V = IR.
If the voltage across the resistor is decreased, it would result in a decrease in the current through the resistor. For instance, if the voltage is decreased by 4 units, the current will drop by a factor that is equal to '4 divided by the resistance (R).' This is because current is directly proportional to voltage, maintaining a constant resistance.
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Please help this determines my grade! A 25 V battery is connected into a circuit with two resistors in series. One resistor has resistance 5.0 Ω and the other has resistance 7.5 Ω. What is the voltage drop across the 7.5 Ω resistor?
15 V
25 V
10 V
0 V
The answer is V=25(7.5/(7.5+5)).
This is the voltage divider equation.
I hope this helps!
Answer:
I am so sorry
Explanation:
if your still here. Have you taken the algebra 2 B unit 8 semester B exam??
The word inverse means ____ and is an alternative word for __________ relationship.
A. same, direct
B. opposite, direct
C. opposite, indirect
D. same, indirect
Answer:
B - Opposite, and direct
The word inverse means c) opposite and is an alternative word for indirect relationship.
In mathematics, this often refers to a situation where one value increases while the other decreases, creating a contrasting effect between the two variables.
Types of Relationships: When discussing relationships between variables:
A direct relationship means that as one variable increases, the other variable also increases.
An inverse relationship, on the other hand, indicates that as one variable increases, the other decreases.
In this context, the question asks for an alternative word for inverse relationships. The correct option would be that it is an alternative word for an indirect relationship since as one variable goes up, the other goes down, highlighting the opposite effect.
a screen door spring has a spring constant of 188 N/m, and when stretched, exerts a 59.5 N force on the door. how far is the spring stretched?(unit=m) PLEASE HELPPPPP MEEE
Answer:0.316 m
Explanation:
The spring is stretched by 0.316 m, when force is exerted.
What is Hooke's law?If a spring is stretched from its equilibrium position, then a force with magnitude proportional to the increase in length from the equilibrium length is pulling each end.
F = kx
where k is the proportionality constant called the spring constant or force constant.
Given, a screen door spring has a spring constant of 188 N/m, and when stretched, a 59.5 N force is applied on the door.
Substitute the values, we get
59.5 = 188 x
x = 0.316 m
Thus, the spring is stretched by 0.316 m, when force is exerted.
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PLEASE HELP ME check the photo.
Answer:
1/ How do scientists determine the elements present in different stars?
KEY WORD for the main idea: Analysis of the starlight.
Answer: Scientists can identify what elements present in different stars by analysing the starlight.
Note: The "starlight" = spectral lines. Astronomers can can identify what kinds of stuff are in stars from the lines they find in star's spectrum. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.
..
2/ What happens to a star when the fuel for its nuclear fusion reactions is exhausted?
KEY WORD for the main idea: generate light from energy
Answer: A star generates energy through nuclear fusion; this energy is released a light and heat.
Note: The energy source for all stars is nuclear fusion. Stars spend most of their lives repetitively compressing two hydrogen atoms into a single helium atom - plus a lot of energy, which is released as light and heat. A normal star that has exhausted the nuclear fuel in its interior, its outer layers have expanded, and it has become a red giant.
....
3/ Why aren't stars and galaxies spread out evenly across the universe?
KEY WORD for the main idea: Gravitational attraction
Answer: Stars and Galaxies aren't evenly distributed uniformly throughout the universe, because of the existance of gravity.
Note: Gravity, as one of the fundamental forces of the universe, is the powerful force that glues our universe together. This is the one that causes every object in the universe to attract every other object. One of the most noticeable effects of gravity in the solar system is the orbit of the planets.
Explanation:
Hope this answer can help you. Have a nice day !
ASAP -Will give brainliest - Look at the graph below. Which of these lines represents the fastest moving object?
Answer:
Purple
Explanation:
They've all gone for the same amount of time, but purple is pointed the highest
pls vote me brainliest
a car driver takes a total of two hours to make a journey of 75 km. She has a coffee
of half an hour and spends a quarter of an hour stationary in a traffic jam. At what
erage speed must she travel during the rest of the time if she wants to complete the
journey in the two hours?
Final answer:
The driver must maintain an average speed of 60 km/h during the driving portion of the trip to cover 75 km in the remaining 1.25 hours after a coffee break and traffic jam.
Explanation:
The average speed necessary to complete a journey given certain time constraints. To determine the needed average speed, we can subtract the time spent not driving (coffee break and traffic jam) from the total time available for the trip. This gives us the actual driving time. Using the formula speed = distance \ time, we can calculate the average speed required to cover the 75 km journey in the remaining driving time.
In this case, the driver spends half an hour on coffee (0.5 hours) and a quarter of an hour (0.25 hours) in a traffic jam, which subtracted from 2 hours gives 1.25 hours (2 - 0.5 - 0.25 = 1.25 hours) of driving time. The average speed required is then speed = 75 km \ 1.25 hours = 60 km/h.
If a thunder clap comes 1.5 s after the lightning strike, how far away is the
strike?
Answer:
514.5 meters
1687.9921 feet
Explanation:
speed of sound = 343 m/s
1.5 (seconds) x 343 (m/s) = 514.5 meters
The distance of the lightning strike is approximately 514.5 meters or 0.5145 kilometers away, calculated by multiplying the time delay of the thunder clap (1.5 seconds) with the average speed of sound (343 m/s).
Explanation:If a thunder clap comes 1.5 seconds after a lightning strike, you can estimate the distance of the strike from your location. Since the speed of sound varies with temperature, we'll use the average speed of sound at room temperature, which is approximately 343 meters per second. To calculate the distance, you multiply the time it takes to hear the thunder (1.5 seconds) by the speed of sound (343 m/s), which equals to about 514.5 meters or roughly 0.5145 kilometers away.
A submarine is carefully navigating its way to the seafloor. It sends out “pings”—a radar wave—as it descends to keep track of its location in relation to the ground. The wavelength of the radar as it leaves the ship is 3 cm. Which of the following could be the wavelength as the wave returns? show work
A. 2 cm
B. 3 cm
C. 4 cm
D. impossible to estimate
Answer:
D. impossible to estimate
Explanation:
According to the doppler effect, the frequency of the wave will increase.
let u be the speed of the submarine,
let the speed of sound in water be c,
let initial frequency of the sent out wave be f,
let frequency of received wave be f'
The distance occupied by the new wave will be (c - u), therefore, the new wavelenght will be (c - u)/f
Frequency = speed of sound ÷ wavelenght
therefore the new Freq f' will be
f' = cf/(c - u) which will be shorter than the initial wavelenght.
But we do not know the speed of the submarine, so we can't estimate.
The permanent bar magnet is moved to the left, toward a loop of wire (as shown). The north pole of the magnet is closer to the loop, as shown. What direction will the (induced) magnetic field be in the center of the loop of wire?
The direction of the induced magnetic field will be the same as the direction of the external magnetic field.
The Direction of magnetic field:As per Felhming's right-hand rule: The direction of the magnetic field is perpendicular to the wire and is in the direction of the fingers of your right hand.
The direction of induced current in the coil is clockwise. Since the magnet is being moved away, the magnetic flux linked with the coil must be decreasing. Hence the induced magnetic field must be in the same direction as the external magnetic field.
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Can someone please help me with this pre ap physics question?
Answer:
they will be moving east and west, or perpendicular to particles of the wave.
Explanation:
Answer:
The answer is B: Perpendicular to the particles of the wave
Explanation:
A 6,000-watt electric water heater is plugged into a 240-volt outlet and used for 0.75 hours. How much current runs through the water heater?
0.04 amps
19 amps
25 amps
33 amps
The current running through the water heater is found by dividing the power by the voltage. In this case, it works out to be 25 amps.
Explanation:To find the current, we use the formula for power in electrical circuits: Power = Voltage x Current. In this situation, the power is 6,000 watts, and the voltage is 240 volts. So to find the current, we only need to rearrange the formula to Current = Power / Voltage = 6000 / 240,
When calculating this, we find that the current is indeed 25 amperes. Therefore, when the electric water heater is used for 0.75 hours, it uses a current of 25 amps.
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