A man on the moon with a mass of 90 kilograms weighs 146 newtons. The radius of the moon is 1.74 × 106meters. Find the mass of the moon.

Answers

Answer 1

Answer:

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Define the efficiency of an energy converter.

Answers

Efficiency = (output energy) divided by (input energy) .

It's always less than 1 .

Also, it's commonly expressed as a percent. To get the percent,
just multiply the number by 100.

Which single force acts on an object in freefall?A. Gravity
B. Fluid forces
C. Air resistance
D. Friction

Answers

It has to be a)gravity

gravity is the correct answer

A tennis ball is released from a height of 4.0 m above the floor. After its third bounce off the floor, it reaches a height of 183 cm. What percentage of its mechanical energy does it lose with each bounce?23%

27%

20%

15%

Answers

Answer:

The percentage of its mechanical energy does the ball lose with each bounce is 23 %

Explanation:

Given data,

The tennis ball is released from the height, h = 4 m

After the third bounce it reaches height, h' = 183 cm

= 1.83 m

The total mechanical energy of the ball is equal to its maximum P.E

E = mgh

= 4 mg

At height h', the P.E becomes

E' = mgh'

= 1.83 mg

The percentage of change in energy the ball retains to its original energy,

$\Delta E\%=(1.83mg)/(4mg)*100\%$

ΔE % = 45 %

The ball retains only the 45% of its original energy after 3 bounces.

Therefore, the energy retains in each bounce is

∛ (0.45) = 0.77

The ball retains only the 77% of its original energy.

The energy lost to the floor is,

E = 100 - 77

= 23 %

Hence, the percentage of its mechanical energy does the ball lose with each bounce is 23 %

Answer: 23

Explanation: gradpoint

Megan wants to see if mice that are fed food A or B grow at a faster rate. She measures the mass of the mice on day 1, then divides them into two groups based on the type of food they will be given. She feeds each group the same amount of food at the same time each day. Does Megan have a control group in this experiment?

Answers

Answer:

Explanation:

It is an example of experimental group. Experimental group is defined as the group in an experiment under which each variable is tested, however, one variable is tested at a time.

On the other hand, control group is defined as the group which does not receive treatment by the researchers.

The only difference between the both group is that, under experimental group independent variable is changed but under control group it is held constant.

No, there is no control group because each group is treated under test conditions.

Variations to the forehand stroke are not allowed. a. true b. false

Answers

This is b. false

There are numerous ways of adjusting the forehand stroke and variations are allowed.

Answer:

false

Explanation:

The forehand stroke is a basic shot in tennis, variations are allowed in order to boost performance (power, topspin and accuracy) of the player. Some guidelines to choose the correct forehand stroke are to visualize the correct stroke, position correctly, correct footwork and selecting shot location.

Why evaporation are called surface phenomenon?

Answers

It is called surface phenomenon because when the molecules at the surface obtain kinetic energy because of heat and light absorption and overcome binding forces and then evaporate out so it is called surface phenomenon....

The water formed on the surface of the water evaporation loss (evaporation), consisting of plant transpiration water loss (transpiration) is called. Soil near the plant and the resulting water loss is called by evapotranspiration.

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Two asteroids bump in space. The larger one has a mass of 3000 kg and the smaller one has a mass of 100 kg. If the force of the collision is 10,000 newtons on each asteroid, what are their accelerations?a. The larger one is unaffected by the collision, while the smaller one accelerates at 100 m/s2. b. The larger one accelerates at 3.33 m/s2, while the smaller one accelerates at 100 m/s2. c. The larger one accelerates at 100 m/s2, while the smaller one accelerates at 3.33 m/s2. d. The ...