Answer:
D: 1.56
Explanation:
On a frictionless plane, W||=Wsin(θ). To push the brick up the plane, the car has to push with a force just greater than W||. To lift the brick directly, a force just greater than W must be used. The mechanical advantage is the ratio of the force needed to lift the brick directly to the force needed to lift the brick with the plane:
MA=Force needed to lift object without inclined plane/Force needed to lift object with inclined plane
MA=W/W||
MA=W/Wsin(θ)
MA=1/sin(40∘)
MA=1.56
look at it just look at it
Answer:
90 degrees
Explanation:
Answer: oh my goodness that is the epitome of laziness
Explanation:
Calculate the equivalent resistance of the circuit below.
Answer:
30Ω
Explanation:
To calculate the equivalent resistance in the circuit, do the following:
Step 1:
10Ω and 20Ω are in series connection. Therefore their equivalent is: 10 + 20 = 30Ω
Step 2:
The equivalent resistance (30Ω) obtained from the above is in parallel connection with 30Ω resistance shown in the diagram above.
Therefore their equivalent is given by:
1/30 + 1/30 = 2/30 = 1/15.
Now invert to obtain the equivalent
Therefore, the equivalent is 15Ω
Step 3:
Determination of the overall equivalent of the resistance of the circuit.
The new equivalent resistance 15Ω obtained above is in series connection with 15Ω resistance in the diagram above.
Therefore their equivalent is given by:
15Ω + 15Ω = 30Ω
Therefore, the equivalent resistance in the circuit is 30Ω
Describe what happens to the energy of a wave if the frequency decreases and the frequency increased
"As frequency increases, wavelength decreases. Frequency and wavelength are inversely proportional. This basically means that when the wavelength is increased, the frequency decreases and vice versa. Wavelength is described as the distance between a trough to a trough or a crest to a crest."
I'd recommend paraphrasing it tho.
Where is the epicenter of the earthquake located?
Answer:
The surface where they slip is called the fault or fault plane. The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. Sometimes an earthquake has foreshocks.
It takes 20s for 3x10^6 electrons to flow through a wire ,what is the current?
Answer:
Explanation:
The variables we know and are given are:
time, t = 20s
Charge, Q = 3x1-^-6 electrons, which is just 3x10^-6C (C stands for Coulombs, which is the unit for Charge)
We need to find the current, I, and since we know Q and t we can substitute these values into the given equation:
I=Q/t (which if you look at what the RHS is saying, its Charge over time, or more literally means the amount of charge passing a point over a period of time)
If we substitute these values, we will get I as:
I = Q / t
I = 3x10^-6 / 20
I = 1.5x10^-7 A
Hope this helps!
When Missourians carve their initials into the bark of a tree, the damage leaves the tree open to ____________________.
Answer:
Disease and insects
Explanation:
Carving into tree bark opens the tree to risks such as insect infestation, diseases like Dutch elm disease and chestnut blight, and environmental stress factors.
When Missourians carve their initials into the bark of a tree, the damage leaves the tree open to insects, disease, and other environmental stresses. The tree's bark is a protective barrier, and when it's damaged, harmful organisms and factors can penetrate and cause various kinds of damage. For instance, small mammals like rodents may chew the bark further, insects such as borers can burrow into the tree's cambium, and fungal diseases can infect the tree leading to potential decay or even the tree's death.
In more severe cases, this kind of damage might enable more aggressive pathogens such as the ones responsible for Dutch elm disease or chestnut blight to enter the tree. These diseases have had a significant impact on tree populations in the U.S., causing economic and aesthetic losses. Additionally, damage to the bark can increase the likelihood of environmental stress impacts, such as damage from freezing temperatures or physical injury from larger mammals.
for a large atom, which of the following would give the most stable nuclear configuration?
A.)An equal number of neutrons and protons
B.)More neutrons than protons
C.)More protons than neutrons
D.)An equal number of protons and electrons
My answer is D but I will still try to word it out again
Answer:D
Explanation:
Hope it helps
12 kg of gold at 90°C cools to 20°C. How much heat is
given off?
Please help :)
Final answer:
The gold releases 109,200 joules of heat as it cools from 90°C to 20°C. The specific heat capacity of gold (0.129 J/g°C) and the mass of the gold (12 kg) were used to calculate the heat transfer.
Explanation:
To calculate how much heat is given off when 12 kg of gold cools from 90°C to 20°C, we use the formula for heat transfer Q = mcΔT, where m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
First, we need the specific heat capacity of gold, which is 0.129 J/g°C. Since the mass of gold is given in kilograms, we need to convert it to grams (1 kg = 1000 g). The mass of the gold is 12000 g (12 kg * 1000 g/kg).
The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 20°C - 90°C = -70°C.
Now we can calculate the heat transfer:
Q = m * c * ΔT
Q = 12000 g * 0.129 J/g°C * (-70°C)
Q = -109200 J
Negative sign indicates that the heat is released. Thus, the gold releases 109,200 joules as it cools.
A wave travels at a constant speed. How does the wavelength change if the
frequency is increased by a factor of 2? Assume the speed of the wave
remains unchanged.
O
A. The wavelength decreases by a factor of 2.
O
B. The wavelength increases by a factor of 2.
O
c. The wavelength does not change.
O
D. The wavelength increases by a factor of 4.
SUBMIT
Answer:
A is the correct answer
Explanation:
just did the test
The correct answer is option A. The wavelength decreases by a factor of 2.
What is a wavelength example?Wavelength is the distance between the crests of waves or a person's general attitude. An example of wavelength is the distance between the crest of two waves. An example of wavelength is when you and another person share the same general attitude and can thus communicate well. The distance between crests of a wave.
How does wavelength affect light?Both Wave 1 and Wave 2 have the same wavelength but different amplitudes. The wavelength of light is an important property for it is this that determines the nature of the light. Red light has a different wavelength from that of blue light and green light has a different wavelength from both of them.
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The brakes on a bicycle apply 95 N of force to the wheels. When the
brakes are applied, the bicycle comes to a stop in 16 m. How much work
are the brakes doing on the wheels?
The work done by the bicycle brakes is calculated by multiplying the braking force of 95 N by the stopping distance of 16 m, resulting in 1520 joules of work done.
To calculate the work done by the brakes on the bicycle, we need to use the work-energy principle. Work is defined as the force multiplied by the distance over which the force is applied, provided the force is applied in the direction of the movement. The formula for work is:
Work (W) = Force (F) times Distance (d)
In this case, the brakes apply a force of 95 N to the wheels, and the bicycle comes to a stop in 16 m. Therefore, the work done by the brakes is:
W = 95 N times 16 m = 1520 J (joules)
Since the direction of the braking force is opposite to the direction of motion, and the bicycle comes to a stop, the entire work done by the brakes is used to dissipate the bicycle's kinetic energy as heat and other forms of energy due to friction.
Physics is explicitly involved in studying which of these activities?
A.
the mixing of metals to form an alloy
B.
the metabolic functions of a living organism
C.
the motion of a spacecraft under gravitational influence
D.
the depletion of the atmospheric ozone layer due to pollutants
E.
the killing of cancerous cells by radiation therapy
How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)
A. 0.008 s
B. 8 s
C. 120 s
D. 1,785,000 s
Answer:
I think it's A. 0.008 s
Explanation:
divide 15,000 w/0.008 s
=1,875,000
What is the wavelength of a beam of light traveling through a vacuum with a frequency of
1.5 * 1012Hz? The speed of light in a vacuum is 3.00 x 108m/s.
5.0 x 10*m
2.0 x 104m
5.0 x 10 m
2.0 x 103m
5.0 x 10^m
The wavelength of the given light is required.
The wavelength of the light is [tex]2\times 10^{-4}\ \text{m}[/tex]
v = Velocity of light = [tex]3\times 10^8\ \text{m/s}[/tex]
f = Frequency = [tex]1.5\times 10^{12}\ \text{Hz}[/tex]
Wavelength is given by
[tex]\lambda=\dfrac{v}{f}[/tex]
[tex]\Rightarrow \lambda=\dfrac{3\times 10^8}{1.5\times 10^{12}}[/tex]
[tex]\Rightarrow \lambda=2\times 10^{-4}\ \text{m}[/tex]
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The wavelength of the light is 2.00 × [tex]10^{-4 }[/tex]meters.The correct option is Option B ( 2.00 × [tex]10^{-4 }[/tex] meters ).
To find the wavelength of a beam of light traveling through a vacuum with a frequency of 1.5 × [tex]10^{12}[/tex] Hz, we use the equation that relates the speed of light (c), frequency (f), and wavelength (λ):
c = f×λGiven that the speed of light in a vacuum (c) is 3.00 × [tex]10^8[/tex] m/s, we rearrange the equation to solve for wavelength (λ):
λ = c / fSubstitute the values into the equation:λ = (3.00 × [tex]10^8[/tex] m/s) / (1.5 × [tex]10^{12}[/tex] Hz)Perform the division:λ = 2.00 × [tex]10^{-4}[/tex] mTherefore, the wavelength of the light is 2.00 × [tex]10^{-4}[/tex] meters.
How do fission nuclear reactions differ from fusion nuclear reactions? Fission reactions involve the conversion of matter into energy, but fusion reactions do not. Fusion reactions involve the conversion of matter into energy, but fission reactions do not. Fission reactions are used to generate electricity for consumers, but fusion reactions are not. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.
How do fission nuclear reactions differ from fusion nuclear reactions?
A. Fission reactions involve the conversion of matter into energy, but fusion reactions do not.
B. Fusion reactions involve the conversion of matter into energy, but fission reactions do not.
C. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.
D. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.
Answer:
C
Explanation:
Both fission and fusion are nuclear reactions that produce energy, but their applications differs.
Fission is the splitting of a large (heavy, unstable) nucleus into smaller ones, and fusion is the process where nuclei of small atoms are combine together to form the nuclei of larger atoms releasing vast amounts of energy.
The correct answer is c. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.
The physics of fusion is the process that makes the sun shine, and that makes the hydrogen bomb explode.
Which of the following is a unique feature of the Earth's environment that aerospace engineers needed to imitate on a spacecraft in order to make manned spaceflight possible?
A. The Earth has a strong magnetic field.
B. The Earth has an atmosphere rich in carbon dioxide and hydrogen.
C. The Earth has a strong gravitational field.
D. The Earth has an atmosphere rich in nitrogen and oxygen.
Answer: The answer is B
Explanation:
The Earth has an atmosphere rich in nitrogen (78%) and oxygen (20%). Aerospace engineers have designed systems that supply astronauts with air that is very similar in composition to Earth's atmosphere. This means that the air fed into spacecraft is mostly nitrogen and oxygen.
The correct statement is " The Earth has an atmosphere rich in nitrogen and oxygen." The correct option is D.
What does Earth's atmosphere contain?The Earth's atmosphere is rich in nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases. This atmosphere provides a number of benefits that are critical for human spaceflight, including:
Protection from solar radiation: The Earth's atmosphere shields us from harmful solar radiation, which can cause DNA damage and increase the risk of cancer. Without this protection, astronauts would be at a much higher risk of radiation sickness and other health problems.
Regulation of temperature: The Earth's atmosphere helps to regulate the planet's temperature by trapping heat from the sun and preventing it from escaping into space. In the absence of an atmosphere, spacecraft would rapidly heat up or cool down, making it difficult to maintain a comfortable temperature for human occupants.
Breathing air: The Earth's atmosphere provides a ready source of breathable air, which is essential for human life. By imitating the composition of the Earth's atmosphere inside a spacecraft, astronauts can breathe comfortably without the need for bulky oxygen tanks or other life support systems.
In contrast, the other options are not unique features of the Earth's environment that are critical for human spaceflight:
A. The Earth has a strong magnetic field: While the Earth's magnetic field provides some protection from solar radiation, it is not essential for human spaceflight. In fact, spacecraft often use the lack of a magnetic field in space to perform scientific experiments that would be difficult or impossible to conduct on Earth.
B. The Earth has an atmosphere rich in carbon dioxide and hydrogen: While carbon dioxide and hydrogen are important components of the Earth's atmosphere, they are not critical for human spaceflight. In fact, carbon dioxide is often considered a pollutant that must be removed from the air inside a spacecraft, while hydrogen is a highly flammable gas that poses a safety risk.
C. The Earth has a strong gravitational field: While gravity is certainly important for human spaceflight, it is not unique to the Earth's environment. In fact, spacecraft can simulate the effects of gravity using centrifugal force, and some proposals for long-duration space missions involve using artificial gravity to counteract the negative effects of zero gravity on the human body.
Therefore, The correct option is D. The Earth has an atmosphere rich in nitrogen and oxygen.
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The part of the electromagnetic spectrum that the human eye can detect is divided into ultraviolet light, visible light and infrared light.
True
False
Answer:
false
Explanation:
we can only see wavelengths on the visible light spectrum. everything else is invisible to us
The part of the electromagnetic spectrum that the human eye can detect is divided into ultraviolet light, visible light and infrared light. This is false statement.
What is electromagnetic radiation?Electromagnetic waves, which are synchronized oscillations of the electric and magnetic fields, are the traditional form of electromagnetic radiation. The electromagnetic spectrum is created at various wavelengths depending on the oscillation frequency. Electromagnetic waves move at the speed of light, typically abbreviated as c, in a vacuum.
The oscillations of the two fields create a transverse wave in homogeneous, isotropic media when they are perpendicular to each other, perpendicular to the direction of energy and wave propagation, and perpendicular to each other.
Hence, the part of the electromagnetic spectrum that the human eye can detect is visible light.
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7. In the free-body diagram shown to the right,
which of the following is the gravitational force
acting on the car?
a. 5800 N
c. 14 700 N
b. 775 N
d. 13 690 N
5800 N
275 N
-
14 700 N
Answer:
the answer is 14700 NExplanation:
because gravitational forcean attractive force exists between all objects with mass
In the free-body diagram shown to the right, the gravitational force acting on the car is 14 700 N. Hence option c is correct.
What is gravitational force?Gravitational force is defined as the magnetic pull that the earth has on all other objects in the universe. Your body is kept on the ground by this force. Gravity, however, draws all mass-bearing objects in the same direction.
List every force influencing the thing. The object's free body diagram should be drawn. Identify the positive and negative directions. Add the forces in the positive direction and subtract the forces in the negative direction. The combined effect of all pushing and pulling forces that are actually acting on an object is known as the net force.
Thus, in the free-body diagram shown to the right, the gravitational force acting on the car is 14 700 N. Hence option c is correct.
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Give an example of a question that can be answered by science and a question that could be better answered by philosophy.
Answer:
"Where are we?" versus "Why are we here?" is a common example. We may never be able to explain why we exist or for what purpose we exist, but we can point to a map or coordinates and produce scientific evidence of where we are.
Explanation:
What temperature a water boil is a question of science, and what purpose life serves is a question of philosophy.
What degree does water begin to boil?
The answer is that at sea level, water boils at 100 degrees Celsius (212 degrees Fahrenheit).
Because it includes a quantifiable and reproducible phenomenon, this query falls under the purview of science. It can be resolved through experimental observations and the use of scientific ideas, particularly the comprehension of the physical characteristics of water and how they alter with temperature and pressure.
What purpose does life serve?
The answer varies depending on personal ideas, values, and philosophical viewpoints.
Given that it involves arbitrary interpretations of the meaning of life and abstract notions, this question is best suited for philosophy. It goes into more profound existential and philosophical questions that science, as an approach based on empirical observation and investigation, may not be able to answer. This is an issue that requires personal reflection and introspection rather than being something that can be objectively measured or demonstrated using scientific methods because the answer may vary for many individuals and philosophical systems.
Hence, What degrees a water boil is a question of science, and what purpose life serves is a question of philosophy.
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Electrons flowing into a resistor make that end
A. positive with respect to the other end
B. negative with respect to the other end
C. higher in resistance
D. extremely warm
Answer:
negative with respect to the other end
Explanation:
Electrons are subatomic particle which carries negative charge. They are attributed to carry the electrical charges in solids.
Since electron carries negative charge , if it flows to one end of resistor then that end will have negative charge on it. Also other end has no charge so, if we compare both the ends . End with electrical charge is negative with respect to other end .
object moving at a constant velocity will always have a
Answer:
object moving at a constant velocity will always have a
Zero acceleration
Answer:
Zero Acceleration
Explanation:
Correct on Edge
5. Electromagnetic radiation travels at a speed of 3.0 x 10^8 m/s.
a) What is the wavelength of a radio wave that has a frequency of 3.5 x 10^5 Hz? b) What is the frequency of an X-ray that has a wavelength of 2.5 x 10^-10 m?
Answer:
a=805714*10^2
b=1.2*10^18
Explanation:
a) v=lf
Where l is wavelength sorry can't draw it
3*100000000=l*350000
L=8. 5714*10^2
b) v=lf
300000000=0.00000000025f
f=1.2*10^18
The table below describes 100 offspring of the same two parents. What are the most likely genotypes of the parents?
Data table
A. Ff Ee and ff ee
B. ff Ee and ff ee
C. Ff Ee and Ff Ee
D. FF EE and ff ee
Answer:
A. Ff Ee and ff ee
Explanation:
The table shows approximately equal numbers of black-fur and white-fur offspring, as well as approximately equal numbers of black-eyed and red-eyed offspring. If one parent is Ff Ee and the other is ff ee, the second parent will only contribute recessive genes (f and e) to the offspring. The first parent will contribute F alleles to about half of its offspring, and f alleles to the rest, resulting in similar numbers of black fur (Ff) and white fur (ff) offspring. The same logic applies to eye color. Of the remaining answers, B is not possible because all of the offspring of these parents will have white fur. D is not possible because all of the offspring will inherit an F and an E from the first parent, so all will have black fur and black eyes. Choice C is a possible answer, but that parent combination should result in about 3/4 black-fur offspring, and 3/4 black-eye offspring.
Which of the following does not apply to a convex lens?
used in magnifying lenses
used in microscopes
used in reacting telescopes
used for correcting near-sightedness
Convex lenses are used for correcting farsightedness, in magnifying lenses, and microscopes but not for correcting near-sightedness; concave lenses are used for that purpose.
Among the options given on uses of a convex lens, the statement that does not apply is that they are 'used for correcting near-sightedness'. A convex lens is a converging lens and is typically used to correct farsightedness (hyperopia), as it causes light rays to converge, thereby shifting the focal point to the retina for those who have difficulty focusing on nearby objects. It is also true that convex lenses are used in magnifying lenses and microscopes to produce magnified, virtual, and erect images of objects placed within their focal length. However, for the correction of near-sightedness (myopia), a concave lens is used, which is a diverging lens that helps to extend the focal length, ensuring that images are focused onto the retina rather than in front of it. Telescopes, specifically refracting telescopes, also utilize convex lenses, but reflective telescopes often use concave mirrors due to benefits such as lack of chromatic aberration and the ability to gather more light.
What is a radio interferometer? a device for correcting chromatic aberration in radio telescopes a device for absorbing and transmitting radio waves a network of several radio telescopes wired together a radio communication network joining several reflecting telescopes
Answer: a network of several radio telescopes wired together
Explanation:
A radio interferometer combines signals of several radio telescopes which are used in astronomical observations simultaneously to simulate a discretely-sampled single telescope of very large aperture
Interferometer, an instrument that uses the interference patterns formed by waves to measure certain characteristics of the waves themselves or of materials that reflect, refract, or transmit the waves. Interferometers can also be used to make precise measurements of distance.
If the strength of the magnetic field at A ls 200 units and the strength of the magnetic field at B is 50 units, what is the
distance to B?
SLO
sham
2009 Odyw
e , no
20 units
100 units
400 units
10 units
Answer:
100 units
I hope this helps you
The density for potassium is 0.856 g/cm3. What would be the mass of a 40 cm3 piece of potassium?
A. 68.48g
B. 46.73g
C. 34.24g
D. 34g
Answer:
38.52g
Explanation:
Answer:
34.24g
Explanation:
for study island said I got it correct.
A ray of light strikes a mirror with an angle of incident of 48º. Calculate: i) the angle of reflection and ii). the angle of deviation. please i really need help in answering this question if anyone answers i will mark you profile as brainliest
Answer:
I) angle of reflection = 48 degrees
II) angle of deviation = 0
Explanation:
Given that the:
angle of incident = 48º.
According to law of reflection which state that the angle of incident is equal to the angle of reflection.
I.) Therefore,
angle of reflection = 48º.
II.) There can only be deviation if the mirror has a diffused surface. But for a smooth plane mirror, there can never be any deviation.
Therefore ,
The angle of deviation = 0
The diagram shows the set-up for an electric doorbell. At bottom, a doorbell. Starting from midright, a wire attached to a contact screw runs to a power source and then to a bell and then to coil around both arms of a U shaped iron core. The coils plus core is labeled electromagnet with the lower arm of the core labeled N and the upper arm labeled S. The wire emerges from the coils to attach to a steel bar at its top end. The bottom end of the steel bar has a short piece of wire leading to a striker. Which best explains why the bell would not ring in this set-up? The circuit is open. The electromagnet has an iron core. The circuit is closed. The electromagnet is made of steel.
The statement which best explains why the bell would not ring in this set-up is "The circuit is open." The correct option is A.
What is circuit open?An open circuit is a circuit where the continuity has been broken, meaning there is a break in the path that the electrons travel on. This can be caused by a switch being turned off, a wire becoming disconnected, or a component in the circuit failing. Without a complete path for the electrons to flow, the circuit is considered "open" and no current can flow. As a result, any devices or components in the circuit will not function.
Here in the Question,
An electric circuit needs to be closed in order for the current to flow and for the doorbell to ring. In this setup, the wire attached to the contact screw needs to be connected to the wire attached to the steel bar in order to close the circuit. If the circuit is open, there will be no current flowing and the bell will not ring.
Option B is not correct because the electromagnet having an iron core is necessary for the doorbell to work. The electromagnet is created by the U-shaped iron core with coils of wire around it. When current flows through the wire, it creates a magnetic field that attracts the steel bar, causing the striker to hit the bell.
Option C is not correct because a closed circuit is necessary for the doorbell to work, not an open circuit.
Option D is not correct because the electromagnet needs to be made of iron or another ferromagnetic material, not steel, in order to create a strong magnetic field.
Therefore, The correct answer is Option A.
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Answer: The answer would indeed be A.
Explanation: I Hope this Helps!
What happens to the magnetic force as the distance between two magnetic poles decreases
It remains constant
It decreases
It increases
It decreases then increases.
Answer: It will increase
The magnetic force increases as the distance between two magnetic poles decreases due to the greater strength of the magnetic field when closer together.
As the distance between two magnetic poles decreases, the magnetic force increases. This is because the strength of the magnetic field from a magnet decreases with distance. When two magnetic objects are brought closer together, the field strength at each object due to the other's pole becomes greater, which results in a stronger magnetic force between them. The relationship between magnetic force and distance is similar to that of electric forces and can be thought of in the same way as Coulomb's Law for electric charges, where the force decreases with the square of the distance between the charges.
In practical terms, when you bring a magnet closer to a piece of iron, the magnetic potential energy of the system decreases because the magnet is moving to a lower potential energy state as it is attracted to the iron. Conversely, if you push two repelling magnets together, their magnetic potential energy increases because work is done against the repulsive force.
When a wire loop is connected to a battery, what is produced in the loop?
Answer:
magnetic field
Explanation:
Answer:
magnetic field
Explanation: