When the moon is waning, what do we see?

A. none of the moon is visible
B. more and more of the moon
C. a full moon
D. less and less of the moon

Answer:

If the work done by us is greater than the excavator in the given time then we can produce more power than excavator.

Explanation:

Power is defined as work done per unit time. Let’s take an example:

Case I:

If we do 300J work in 2 seconds and excavator 500J work in the same time then:

Power produced by us = 300/2 = 150 watt

Power produced by excavator = 500/2 = 250 watt

In this case power produced by excavator is more than us.

Case II:

If we do 500J work in 2 seconds and excavator 300J work in the same time then:

Power produced by us = 500/2 = 250 watt

Power produced by excavator = 300/2 = 150 watt

In this case power produced by us is more than excavator.

Hence, If the work done by us is greater than the excavator in the given time then we can produce more power than excavator. But it is very difficult to believe in reality.

B

Because when a woolen cap rubs Jamie’s hair, electrons are transferred from Jamie’s hair to the woolen cap. As a result, his hair turns positively charged, and the cap turns positively charged. This happens because hair gives up electrons more readily than wool. Note that positive charges do not get transferred; only electrons can get transferred.

The electrons are transferred from Jamie’s hair to the woolen cap by triboelectric effect

Triboelectric effect, often referred to as triboelectric charging, is a form of contact electrification in which some materials acquire an electrical charge after being cut off from another substance with which they had come into touch.

It is also known as conduction where a negatively charged shares electrons with a neutral body when they are both in contact with each other.

Given data ,

Let the first substance be represented as Jamie's hair

Let the second substance be represented as a woolen cap

Now , the charge on the woolen cap is neutral

From triboelectric effect ,

When the cap is rubbed with the hair , the woolen cap produces static electricity and the excess charges will build upon the surface of the cap

As bound materials rub against one another, negative charges or electrons will be transferred.

Hence , the electrons are transffered from the hair to cap by triboelectric effect

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Answer:

Doppler effect refers to apparent change in frequency/wavelength of the source due to the relative motion between the source and the observer. The frequency increases apparently if the source and observer approach each other and it decreases apparently if the source and the observer move away from each other.

When, apparent frequency increases, it is known as blue-shift and if it decreases, it is known as red-shift.

To accelerate a 12 kg bowling ball at 3 m/s², a force of 36 N is needed. The mass of a truck producing a force of 12,000 N while accelerating at 4 m/s² is 3,000 kg.

The question is asking us to calculate the force required to accelerate a 12 kg bowling ball and to find the mass of a truck given the force it produces and its acceleration. These problems involve using Newton's second law of motion, which states that the force on an object (F) is equal to the mass of the object (M) multiplied by its acceleration (A).

For the bowling ball:

Force (F) = Mass (M) times Acceleration (A)

F = 12 kg times 3 m/s²

F = 36 N (newtons)

For the truck:

Force (F) = Mass (M) times Acceleration (A)

12,000 N = M  imes 4 m/s²

M = 12,000 N / 4 m/s²

M = 3,000 kg

Final answer:

Water turns to steam by absorbing energy that increases the kinetic and potential energy of water molecules, allowing them to escape into the air as gas. So the correct option is C.

Explanation:

When water turns to steam, it absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas. During the process of boiling, heat energy increases the water molecules' kinetic energy, leading to the breaking of hydrogen bonds that held water molecules close together. When these bonds break, water molecules can move freely and escape into the air as steam or water vapor. This endothermic transition requires a significant amount of energy due to water's high heat of vaporization.

The correct statement describing this change of state is thus:
C.The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.

The displacement of the ball is 45 meters elapsed time is 3 seconds, and the direction is toward the goal. Therefore, the average velocity is 15m/s. Therefore, option (B) is correct.

The velocity of a moving object can be described as a vector measurement of the direction and the rate of motion of an object. The velocity can be defined as the change in the position of the object w.r.t. time.

Velocity can be described as a vector parameter as it exhibits both magnitude and direction. A mathematical expression to determine velocity is shown below:

v = d / t

where d is the distance moved by an object, and t is the time.

Given, the length of the soccer field = 90 meter

The distance traveled by the ball from halfway down the soccer field,

d = 90/2 = 45 m

The time taken by the ball, t = 3s

The average velocity of the ball, v = 45/3 = 15 m/s

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Net force that is required to bring the car to a halt =6400 N

Explanation:

Using kinematic equation to calculate the acceleration a

Vf²= Vi²+ 2 a d

Vf= final velocity=0

Vi= initial velocity= 20 m/s

a= acceleration

d= distance=50 m

0²= (20)²+ 2 a (50)

a=-4 m/s²

Now force= F = ma

m= mass= 1600 kg

F= 1600 (-4)

F=-6400 N

negative sign indicates that the force is opposing the motion of the car.

Answer:

A) sound to be transferre

Explanation:
As the vacuum jar is emptied of air, the volume of the ringing bell will gradually diminish until it becomes inaudible. This occurrence can be attributed to the fact that sound necessitates the presence of air in order to propagate. Sound, being a form of mechanical wave, relies on a medium, like air, to transmit its vibrations.

Final answer:

As air is pumped from the vacuum jar, the sound level of the ringing bell will decrease until it can no longer be heard. This happens because air must be present in the jar for sound to be transferred, hence the correct answer is (a) sound to be transferred.

Explanation:

Sound is a form of energy that travels through the vibration of particles in a medium, such as air, water, or solids. When the air is removed from the jar, the number of particles that can vibrate and carry sound waves diminishes, eventually reaching a point where there are not enough air molecules to facilitate the transmission of sound. Sound cannot travel through a vacuum as there is no medium to transmit the vibrations. In comparison to the speed of sound in various gases, the speed of sound in a vacuum is zero, because sound simply does not travel when there is an absence of a conveyable medium. Similarly, the demonstration of sound reinforcement when a tuning fork is placed against a table helps illustrate that the transfer of energy requires a medium. The same principle applies to resonance in containers of air; as the air inside resonates with the sound frequency, we are able to hear the sound due to the air amplifying the vibrations.

Answer:

80 electrons

Explanation:

80 electrons

So, there must be 201 - 80 = 121 neutrons. Since atoms are electrically neutral, there must be as many electrons as there are protons. A mercury atom needs 80 electrons to balance the 80 protons

The true answer is C.

The boat is attracted to the magnet by the force of magnetism.

Let me explain. If Ashley made the paper boat and place it on the water, gravity will try to pull the boat down, however no magnets are used in this situation.

Now if magnets are used in this situation and the paper clip is attach to the boat, rather than gravity pulling it down, the magnet will be pulling paper clip, causing the boat to move, so instead of gravity, it's magnetism.

Note: Magnets=Magnetism

Answer:

The answer is C

In the illustration, the light ray is indeed reflected. Here's why:

Reflection is the phenomenon where light bounces off a surface and changes its direction. In the image, the light ray bends sharply back upon hitting the object, indicating this type of interaction.

Absorption occurs when light is captured by a material and converted into another form of energy, like heat. The illustration doesn't show any such energy dissipation.

Refraction refers to the bending of light as it passes from one medium to another, like air to water. The object appears solid with no clear interface for refraction to occur.

Stopped wouldn't be an accurate description as the light changes direction upon hitting the object. It continues propagating, just in a different path.

Therefore, reflected is the most fitting description for the behavior of the light ray in the illustration.

Answer:

cod

Explanation:

hope this helps!

Diffraction is sounds with a larger wavelength to bend around obstacles more easily. Therefore, option A is correct.

Diffraction is the interference or bending of waves via an aperture into the area that is geometrically in the shadow of the obstruction or aperture. Effectively, the wave's secondary source is the diffracting element or aperture.

The bending of waves with a larger wavelength around objects or through apertures with a shorter wavelength results in wave diffraction. If this condition is satisfied, diffraction can occur for both light and sound waves.

Wavelengths of visible light span from 380 to 700 nanometers. Light must pass through an opening that is smaller than 1,000 nanometers for diffraction to take place.

Thus, option A is correct.

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Diffraction refers to the bending of waves around obstacles or through small openings. In the case of sound waves, sounds with a larger wavelength bend around obstacles more easily. This is because sound waves have long wavelengths compared to the size of the obstacles.

Diffraction refers to the bending of waves around obstacles or through small openings. In the case of sound waves, the correct answer is option a. Sounds with a larger wavelength bend around obstacles more easily. This is because sound waves have long wavelengths compared to the size of the obstacles. On the other hand, light waves have very short wavelengths and behave more like rays, so they do not diffract around large obstacles.

The total amount of energy absorbed by a substance as it changes from a solid to a gas at different temperatures can be calculated using the formula Q = m × ΔH. First, calculate the energy required to raise the temperature of the substance. Then, calculate the energy required for the phase changes. Finally, add all the energy values together to find the total amount of energy absorbed.

The total amount of energy absorbed by a substance as it completely changes from a solid to a gas can be calculated using the formula:

Q = m × ΔH

Where:
- Q is the total energy absorbed
- m is the mass of the substance
- ΔH is the enthalpy change of the substance

First, calculate the energy required to raise the temperature of the substance from 40°C to its melting point. Then, calculate the energy required to change the substance from a solid to a liquid. Next, calculate the energy required to raise the temperature of the substance from its melting point to its boiling point. Finally, calculate the energy required to change the substance from a liquid to a gas. Add all these energy values together to find the total amount of energy absorbed.

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Between the earth and the moon we have that the highest temperature is the moon, because it blocks the sun from the earth causing it to heat up more.

The average temperature of the planet is measured through the variation of the temperature of the sea waters. Scientists and researchers emit low-frequency sound waves through the deepest waters of the Pacific Ocean. There are strategic listening points at various locations on the other side of the Pacific that pick up these sounds.

The Moon has no atmosphere, so temperatures range from -184 degrees Celsius at night to 214 degrees Celsius during the day, with the exception of the poles where the temperature is constantly -96 degrees Celsius.

Earth has a lower average temperature than the moon. The moon has far more average temperature than the earth because the earths atmosphere blocks the suns radiation from directly hiting it.

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Answer:

Part 1 Answer: The moon.

Part 2 Answer: The moon doesn't have an atmosphere, meaning it cant let off any of the sun's heat, making the surface temperature very hot compared to Earth's.

Explanation:

I did my research, and this is correct. I hope I helped somebody :)

Answer: The answer is C. Food.

Answer:

The correct answer is the option B) It is a lunar eclipse, in which the Earth casts a shadow on the Moon.

Explanation:

A lunar eclipse is an astronomical phenomenon that occurs when the Earth passes directly between the Moon and the Sun, causing the Earth's shadow produced by sunlight to be cast over the Moon completely covering it. For this to happen, the three celestial bodies must be formed in a straight line.

Every year there are between 2 and 7 lunar eclipses. According to the position of the Moon with respect to the Earth's shadow, 3 types of lunar eclipses occur.

The difference between a lunar eclipse and a solar eclipse is that, in the first case, the Earth stands between the Moon and the Sun casting a shadow on the Moon, while in a solar eclipse, the Moon stands between the Sun and Earth, casting its shadow to a small part of the latter.

Finally, the correct answer is the option B) It is a lunar eclipse, in which the Earth casts a shadow on the Moon.

Answer:

Explained

Explanation:

A student who runs every day is becoming bored with her physical fitness routine and considers quitting. Now in order maintain her fitness routine she needs to break the monotony by changing her exercise regime. She do other activities like play sports two days a week, she do aerobics, she even try some cardio vascular exercises which as good as running. She also try changing her route of running as the new view might inspire her.