Answer:
2.2 x 10-19
Explanation:
Kinetic Energy = 1/2 m v ^2
a train travels 74 kilometers in 1 hours, and then 83 kilometers in 5 hours. what is its average speed
Total distance traveled = 74 + 83 = 157 km.
Total time traveled = 1 + 5 = 6 hours.
Average speed = total distance / total time
Average speed = 157 km / 6 hours = 26.1666 km per hour.
Round the answer as needed.
what must differ between the atom of two different elements?
1. protons in the atom 2. electrons in the atom 3. neutrons in the atom 4. protons and neutrons in the nucleus
Answer:
1. protons in the atom
Explanation:
Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.
The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.
Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.
Therefore, the only correct choice is
1. protons in the atom
Answer:
1. protons in the atom
Explanation:
Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.
The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.
Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.
Therefore, the only correct choice is
1. protons in the atom
A cup of tea at 60°C is sitting on a table in a room whose temperature is 24°C. Choose the best statement concerning heat flow. Heat will flow from the tea into the air in the room. Heat will flow from the air in the room into the tea. There will be no exchange of heat. Heat will flow both ways in equal amounts.
Answer:
Heat will flow from the tea into the air of the room
Explanation:
Heat Transfer
Answer:
Heat will flow from the tea into the air in the room
Explanation:
The sistem is going to find an equilibrium temperature for both elements.
As we have a small hot mass and a large cold mass, that temperature will be colder than the tea (and hotter than the air, but as the size of a cup is too small for a room, it will be almost equal to 24 Celsius)
Then the heat will 'leave' the tea.
Explain, briefly, what the electrical field inside a microwave oven does to heat food.
Answer:
Inside the strong metal box, there is a microwave generator called a magnetron. When you start cooking, the magnetron takes electricity from the power outlet and converts it into high-powered, 12cm (4.7 inch) radio waves. Thus the microwaves pass their energy onto the molecules in the food, rapidly heating it up.May 3, 2018
A microwave oven heats food by producing microwaves that exert force on polar molecules such as water, causing them to rotate rapidly. This rapid rotation increases their thermal motion, producing heat. The heat then spreads to other components of the food, successfully heating the food overall.
Explanation:The electrical field inside a microwave oven plays a fundamental role in heating food. This process works by producing microwaves which are electromagnetic radiation in the radio portion of the spectrum. Microwaves in a microwave oven usually operate at a frequency of 2.45 GHz.
Water molecules and some other constituents in food are known as polar molecules because they have a slight negative charge at one end and a slight positive charge at the other. These microwaves primarily interact with water molecules in the food. The oscillating electrical field of the microwaves exerts a force or torque that aligns these molecules first in one direction and then in the other, making them rotate rapidly.
This rapid rotation pumps energy into the thermal motion of the water molecules, which results in increased temperature or heat. This process is known as dielectric heating. The heat then spreads to other components of the food, heating the food overall. Therefore, the food becomes hot quickly.
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The newest generation of smart phone uses three different batteries connected in a series simultaneously to extend battery life and generate the energy necessary to power the device. If each battery is rated at 2.4 V , what is the overall voltage provided to the phone?
Answer:
7.2 V
Explanation:
The three batteries are connected in series to the terminals of the phone: it means that they are connected along the same branch, so the current flowing through them is the same.
This also means that the potential difference across the phone will be equal to the sum of the voltages provided by each battery.
Here, the voltage provided by each battery is
V = 2.4 V
So, the overall voltage will be
V = 2.4 V + 2.4 V + 2.4 V = 7.2 V
A car changes speed from 25 m/s to 10 m/s in 240 seconds. Describe its acceleration.
Explanation:
Acceleration is change in velocity over change in time:
a = Δv / Δt
a = (10 m/s - 25 m/s) / (240 s - 0 s)
a = -0.0625 m/s²
So the car decelerates at 0.0625 m/s².
What electrons are involved in bonding between atoms? (What are they called)
Answer:
The answer is Valence
Explanation:
I hope me putting the answer instead of a paragraph helps yall<3
Valence electrons, which are located in the outermost shell of an atom, participate in the formation of chemical bonds with other atoms.
Explanation:The electrons that are involved in bonding between atoms are known as 'valence electrons'. These electrons are situated in the outermost shell or energy level of an atom. Their role is extremely essential as they partake in the formation of chemical bonds with other atoms. For instance, in the bonding of two hydrogen atoms to form a hydrogen molecule (H2), each atom provides one electron to form a single covalent bond.
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Looking at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way.
A) Bring a positive and negative object near the top.
B) Bring a negative object near the top.
C) Bring a positive object near the top.
D) Touch the electroscope with any charged object.
Answer:
D) Touch the electroscope with any charged object.
Explanation:
D) Touch the electroscope with any charged object.
The electroscope functions on the presence of charge therefore to repel the two leaves away any charged object will be helpful.
Answer: Option D
Explanation:
The electroscope is a device which functions to detect the charge on the given object. When the two leaves in the electroscope are normally placed, shows no charge is present.
To repel away the leaves, presence of charge is important and therefore when a charged body touches the electroscope, by the induction of opposite charge develops in the electroscope by which the leaves gets similar charges and hence repels away.
a constant force of 10n is applied for 3 seconds to an 8kg object. calculate the change in speed
Answer:
3.75
Explanation:
F= m×a
F=m×(Vf-Vi)/t
10=8×(change in speed)/3
(10×3)÷8=3.75
Which of the following would 15 centimeters be equal to
Answer:
150 millimeters
Explanation:
According to linear conversion of units;
1 cm is equivalent to 10 mm
Therefore, 15 cm will be equivalent to 150 mm
On the other hand;
1 Meter is equivalent 100 cm
Therefore; 15 cm will also be equivalent to 0.15 M
Hence;
15 cm = 150 mm = 0.15 m, and so forth
Which best describes the projectile motion of the marble as it leaves the table at the two different speeds?
Answer:
Marble with higher speed.
Explanation:
When a marble is thrown with low speed, then it covers less horizontal distance but the marble with higher speed covers more horizontal distance though they both travells through same height from table( i.e. vertical distance).
Since both horizontal and vertical distances are responsible for projectile motion, marble with higher speed describes the motion of projectile more effectively.
What is the effective resistance between the points A and D? A) 1.3 Ω B) 2.2 Ω C) 10 Ω D) 12 Ω
Answer:
B) 2.2 Ω
Explanation:
First of all, we should notice that the resistor placed between A and B is short-circuited. In fact, the current from point A will follow the wire above between A and C (which has zero resistance), so we can basically ignore the presence of the resistor between A and B, since it has no effect on the circuit.
Then, we can notice that the two resistors between CB and CD are in parallel to each other; therefore, their equivalent resistance is given by:
[tex]\frac{1}{R}=\frac{1}{R_{BC}}+\frac{1}{R_{CD}}=\frac{1}{4.0 \Omega}+\frac{1}{5.0 \Omega}=\frac{9}{20 \Omega}\\R= \frac{20 \Omega}{9}=2.2 \Omega[/tex]
The ratio of electrostatic force between two electrons to gravitation
force between them is of the order
A) 10
C) 10^3
B)1
D) 10^42
Answer:
D) 10^42
Explanation:
The electrostatic force between two electrons is given by
[tex]F_E = \frac{k q^2}{r^2}[/tex]
where
k is the Coulomb's constant
q is the electron charge
r is the separation between the electrons
The gravitational force between two electrons is
[tex]F_G = \frac{G m^2}{r^2}[/tex]
where
G is the gravitational constant
m is the electron mass
r is the separation between the electrons
So the ratio between the two forces is
[tex]\frac{F_E}{F_G}=\frac{k q^2}{G m^2}=\frac{(9\cdot 10^9 Nm^2 C^{-2} )(1.6 \cdot 10^{-19}C)^2}{(6.67\cdot 10^{-11}m^3 kg^{-1}s^{-2})(9.11\cdot 10^{-31} kg)^2}=4.2\cdot 10^{42}[/tex]
An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator?
Answer:
Velocity is vector quantity.So it needs direction in addition to speed.
Explanation:
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion.
Answer:
It needs to know the direction that the elevator traveled.
Explanation:
Superman is flying 54.5 m/s when he sees
a train about to fall into a river 850 m
away. He reaches the train in 4.22 s.
What is his final velocity?
348.34 m/s. When Superman reaches the train, his final velocity will be 348.34 m/s.
To solve this problem, we are going to use the kinematics equations for constant aceleration. The key for this problem are the equations [tex]d=v_{0} t+\frac{at^{2} }{2}[/tex] and [tex]v_{f} =v_{0} +at[/tex] where [tex]d[/tex] is distance, [tex]v_{0}[/tex] is the initial velocity, [tex]v_{f}[/tex] is the final velocity, [tex]t[/tex] is time, and [tex]a[/tex] is aceleration.
Superman's initial velocity is [tex]v_{0}=54.5\frac{m}{s}[/tex], and he will have to cover a distance d = 850m in a time t = 4.22s. Since we know [tex]d[/tex], [tex]v_{0}[/tex] and [tex]t[/tex], we have to find the aceleration [tex]a[/tex] in order to find [tex]v_{f}[/tex].
From the equation [tex]d=v_{0} t+\frac{at^{2} }{2}[/tex] we have to clear [tex]a[/tex], getting the equation as follows: [tex]a=\frac{2(d-v_{0}t) }{t^{2} }[/tex].
Substituting the values:
[tex]a=\frac{2(850m-54.5\frac{m}{s}.4.22s) }{(4.22s)^{2}}=69.63\frac{m}{s^{2}}[/tex]
To find [tex]v_{f}[/tex] we use the equation [tex]v_{f} =v_{0} +at[/tex].
Substituting the values:
[tex]v_{f} =54.5\frac{m}{s} +(69.63\frac{m}{s^{2}}.4.22s)=348.34\frac{m}{s}[/tex]
The final velocity is found to be approximately 349.07 m/s.
To determine Superman's final velocity when he reaches the train, we need to use the kinematic equations for uniformly accelerated motion. Given:
Initial velocity (u) = 54.5 m/sTime (t) = 4.22 sDistance traveled (s) = 850 mFirst, we can use the kinematic equation:
s = ut + (1/2)at²where s is the distance, u is the initial velocity, t is time, and a is the acceleration. Plugging in the known values:
850 = 54.5 × 4.22 + 0.5 × a × (4.22)²Simplifying this:
850 = 229.29 + 0.5 × a × 17.8084850 - 229.29 = 8.9042a620.71 = 8.9042aa = 620.71 / 8.9042a ≈ 69.69 m/s²Now, we use another kinematic equation to find the final velocity (v):
v = u + atv = 54.5 + (69.69 × 4.22)v = 54.5 + 294.57v ≈ 349.07 m/sTherefore, Superman's final velocity when he reaches the train is approximately 349.07 m/s.
Which imaging techniques capture real-time images? sonography and fluoroscopy radiography and fluoroscopy sonography and CT MRI and CT
Answer:
A. sonography and fluoroscopy (I just took the edg quiz)
The imaging techniques capture real-time images will be sonography and fluoroscopy.
What is sonography and Fluoroscopy?Sonography is a diagnostic medical procedure that uses high-frequency sound waves (ultrasound) to produce dynamic visual images of organs, tissues or blood flow inside the body. This type of procedure is often referred to as a sonogram or ultrasound exam.
fluoroscopy simply serves as an image-guidance tool, and as such, alternative imaging modalities that do not rely on ionizing radiation can and should be considered. For example, as a real-time, high-resolution imaging modality, ultrasound shares many characteristics with fluoroscopy.
However, due to its lack of reliance on ionizing radiation, ultrasound is often the imaging tool of choice for a number of image-guided interventions for which fluoroscopy may also be considered, particularly in the pediatric population.
Hence the imaging techniques capture real-time images will be sonography and fluoroscopy.
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A worker stands on a support and with the help of a block will lift the load evenly, the weight of which is 480 H (fig. 216). calculate the pressure produced by the support worker, if his weight is 720 N, and the foot area is 320 cm² (Friction and block weight can be neglected.)
Explanation:
Draw free body diagrams for the worker and the load.
The worker has three forces on him: normal force pushing up, weight pulling down, and tension pulling down.
The load has three forces on it: weight pulling down and two tension forces pulling up.
Sum of the forces on the load:
∑F = ma
2T - 480 N = 0
T = 240 N
Sum of the forces on the worker:
∑F = ma
N - 720 N - 240 N = 0
N = 960 N
So the pressure produced by the worker is:
P = F / A
P = 960 N / 320 cm²
P = 3 N/cm²
P = 30,000 Pa
What is Electrostatics
Answer: Electrostatics is a branch of physics that studies electric charges at rest.
Answer:
the study of stationary electric charges or fields as opposed to electric currents.
Explanation:
why do metals conduct electricity
Answer: Metals conduct electricity well due to the fact that the outermost electrons in their atoms are held by weak atomic forces, allowing these electrons to flow easily from one atom to another.
Explanation:
Identify the form of energy that matches each example.
Energy from electromagnetic waves:
a. thermal energy
b. chemical energy
c. radiant energy
Energy caused by changes in the structure of a nucleus:
a. kinetic energy
b. nuclear energy
c. potential energy
Energy resulting from movement and vibration of molecules:
a. radiant energy
b. thermal energy
c. kinetic energy
Energy an object has because of its position:
a. potential energy
b. mechanical energy
c. kinetic energy
Answer: First, question 1 is radiant energy.
Question 2 is nuclear energy
Question 3 is thermal energy
Question 4 is potential energy
Explanation Radiation ( or radiant energy) is high-energy electromagnetic waves. Nuclear energy such as nuclear fusion or fission can change the structure of a nucleus therefore lowering the atomic mass. When molecules vibrate, they produce a lot of energy through friction. That energy is converted into heat. An object that is not in motion but it's position can be altered to be in motion contains potential energy. Once the object gets moving, potential energy is converted into kinetic energy.
Radiant energy matches energy from electromagnetic waves, nuclear energy matches energy caused by changes in the structure of a nucleus, thermal energy matches energy resulting from movement and vibration of molecules, and potential energy matches energy an object has because of its position.
Explanation:The forms of energy include thermal energy, radiant energy, electrical energy, nuclear energy, and chemical energy.
Energy from electromagnetic waves is referred to as radiant energy. For example, light, microwaves, and radio waves carry radiant energy.
Energy caused by changes in the structure of a nucleus is known as nuclear energy.
Energy resulting from movement and vibration of molecules is called thermal energy. When objects absorb radiant energy like sunlight or microwaves, it is converted into thermal energy.
The energy an object has because of its position is called potential energy. This includes energy stored in the chemical bonds of compounds, which is called chemical energy.
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name the device used for measuring mass
Hello There!
A triple beam balance is used to tell how many grams, ounces and pounds an object is.
Which statements describe properties of stars? Check all that apply.
Stars produce energy through nuclear fusion.
Stars produce energy through gravity.
Stars are massive objects composed of gas.
Stars are solid objects that we could stand on.
Stars are composed primarily of hydrogen and helium.
Stars are composed primarily of liquids such as water.
Answer:
Stars produce energy through nuclear fusion.Stars are massive objects composed of gas.Stars are composed primarily of hydrogen and helium.Explanation:
Stars are massive objects that have a large gravitational field, which drives the star to contract on itself, which is why fusion occurs: in the center of the star the nuclei of atoms are already so close due to gravity and high temperatures that bind. This is what is called nuclear fusion and is the energy source of a star.
On the other hand yes, the main elements of a star are hydrogen and helium (two hydrogen nuclei fuse to make helium), this makes the star mainly a huge ball of gas so there is no solid surface where you can stand on.
And about water on a star, that is not possible. Temperatures on stars are very vey high that watter could not exist in a liquid form on them.
Stars produce energy through nuclear fusion.
Stars are massive objects composed of gas.
Stars are made primarily of hydrogen as well as helium.
Stars can be regarded as massive objects which contains large gravitational field, that drives the star so as to contract on itself, as a result of this fusion occursAt center of the star there is a nuclei of atoms which are already so close due as a result of gravity as well as high temperatures that bind.the main elements that star is made of are hydrogen and helium, i.e there is fission of two hydrogen nuclei along with helium, As result of this the star is mainly a huge ball containing gasesThere is no water on a star, since there is high temperature on the star and cannot allow water to stay.Stars can be regarded as body which is composed of hydrogen as well as helium, these are been packed so densely in a star
In the star's center there is great pressure that initiate nuclear fusion reactions. Nuclear fusion reaction is the one whereby the nuclei of two atoms comes together to create a new atom.
Therefore, statements that describe properties of stars here Stars produce energy through nuclear fusion is that Stars are been regarded as massive objects which is encompassed gas.
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What must you know to solve Kepler's third law, the law of periods?
A. Period of the minor axis
B. Period of the orbit
C. Period of the revolution around the sun
D. Period of the major axis
Explanation:
According to the Third Kepler’s Law of Planetary motion “The square of the orbital period of a planet is proportional to the cube of the semi-major axis (size) of its orbit”.
Talking in general, this law states a relation between the orbital period [tex]T[/tex] of a body (moon, planet, satellite) orbiting a greater body in space with the size [tex]a[/tex] of its orbit.
This Law is originally expressed as follows:
[tex]T^{2}=\frac{4\pi^{2}}{GM}a^{3}[/tex]
Where;
[tex]G[/tex] is the Gravitational Constant
[tex]M=1.9(10)^{27}kg[/tex] is the mass of the massive (greater) body
[tex]a[/tex] is the semimajor axis of the orbit of the smaller body
Answer:
D. period of the orbit
Jeff’s father is installing a do-it-yourself security system at his house. He needs to get a device from his workshop that converts electric energy to sound energy. Which device is Jeff’s father looking for?
A.
switch
B.
motor
C.
buzzer
D.
bulb
E.
battery
Answer:
The correct answer option is C. buzzer.
Explanation:
We know that Jeff's father needs to get a device from his workshop that converts electrical energy to sound energy.
So from the given options, buzzer is the best option Jeff's father can install in his house's security system.
An electric buzzer converts an electrical oscillating voltage into a sound output. In other words, the electrical pulses are converted into sound vibrations.
Answer:
The correct answer option is C. buzzer.
Explanation:
. A helicopter is 8.50 m above the ground and climbing at 2.5 m/s. It drops a package from rest (relative to the helicopter). At the moment that the package is released, what is its velocity relative to the ground?
Answer:
2.5 m/s
Explanation:
The velocity of the package relative to the ground = the velocity of the package relative to the helicopter + the velocity of the helicopter relative to the ground
v = 0 m/s + 2.5 m/s
v = 2.5 m/s
At the moment it is released, the package is rising at 2.5 m/s.
Final answer:
At the moment of release, the package dropped from the helicopter has an upward initial velocity relative to the ground of 2.5 m/s, equal to the helicopter's climbing velocity.
Explanation:
When a package is dropped from a helicopter that is climbing, the initial velocity of the package relative to the ground is the same as the velocity of the helicopter at that moment. Since the helicopter is climbing at a velocity of 2.5 m/s, the package will also have an initial velocity of 2.5 m/s upward relative to the ground. It is important to note that this is the initial velocity at the moment of release; the package will then be subject to gravitational acceleration which will affect its velocity as it falls.
3. The diagram to the right shows a Bunsen burner heating a beaker of
water on a beaker stand. The arrows represent the transfer of heat
energy in the water. Which process is primarily responsible for the
transfer of heat indicated by the arrows in the beaker of water?
a. conduction
b. convection
c. radiation
d. condensation
Answer:
I think that the answer is B convection. Heat is transferred by the movement of the water from hotter regions to colder regions.
Answer:
b
Explanation:
Does he accelerate as he is being pushed?
Answer:
yes, I would believe so.
Explanation:
Acelerating means moving, picking up speed...etc and well he is being pushed so he's moving.
Hope my answer has helped you!
50+ POINTS and BRAINLIEST
Why does changing the medium affect light? How? And what medium make the wavelength slower and what makes it faster? Please dumb it down or summarize it, I really need help and I'm having trouble understanding this subject.
Explanation:
So this will not exactly be an answer but an explanation.
So you're studying waves I assume? If so great.
For starters we need to figure out where light is fastest; considering what you should know being that if the medium crosses an atom it slows down. This happens when they atom is absorbed. It isn't just one that slows it down it has to be multiple as it takes time to push the emission back out in the same direction.
Higher density = Slower WL
Lower density = Faster WL
Now where light and waves would travel fastest is in a pure vacuum where there is nothing to interrupt the path.
in summary any density slows it down, in a vacuum it can hit it's highest speeds.
If you still need help comment below
if sin 0 equals 5/6 what are the values of cos 0 and tan 0
In a right triangle, the "Sin" of an angle is the ratio of (the leg opposite the angle) to (the hypotenuse of the triangle).
If (sin of the angle) is 5/6, then the angle is in a right triangle where the leg opposite the angle is 5 and the hypotenuse is 6.
The other leg ... the one adjacent to that angle ... is √(6² - 5²).
That's √11 .
-- The (cosine of the angle) is
(leg adjacent to the angle) divided by (hypotenuse of the triangle).
That's √11/6 .
-- The (tangent of the angle) is
(leg opposite the angle) divided by (leg adjacent to the angle) .
That's 5/√11 .
Final answer:
To find cos θ and tan θ, use the Pythagorean identity. For cos θ, calculate √(11/36) and take the positive or negative root based on the quadrant. Compute tan θ by dividing sin θ by cos θ to get 5√11/11.
Explanation:
Given that sin θ equals 5/6, to find the values of cos θ and tan θ, one must remember the Pythagorean identity, which states that sin²(θ) + cos²(θ) = 1. Since we are given sin θ, we can rearrange the identity to solve for cos θ:
cos^2(θ) = 1 - sin²(θ)
cos^2(θ) = 1 - (5/6)²
cos^2(θ) = 1 - 25/36
cos^2(θ) = 11/36
cos θ = ±√(11/36)
cos θ = ±√11/6
To determine the sign of cos θ, we need to know the quadrant in which the angle θ lies. Since sin θ is positive in the question, and assuming the angle is in the first or second quadrant where sin is positive, we choose the positive root if θ is in the first quadrant and the negative root if θ is in the second quadrant. Lastly, tan θ = sin θ / cos θ.
tan θ can then be calculated using the ratio:
tan θ = (5/6) / (√11/6)
tan θ = 5/√11
We can rationalize the denominator to avoid a radical in the denominator:
tan θ = (5/√11) * (√11/√11)
tan θ = 5√11/11
Which are examples of transverse waves? Check all that apply.
The examples of transverse waves are earthquake S waves and Radio waves with visible light and X- rays as the other examples.
Explanation:
The transverse waves are the waves which run perpendicular to direction of the wave. They oscillate at right angle to main wave. They form the crest and troughs which are alternate to each other. All the electromagnetic waves are simply transverse waves as the electric field generated waves are always perpendicular to the magnetic field generated waves.