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Physics

Peter Hebert

Many people are familiar with the fact that a rifle recoils when fired. This recoil is the result of

action-reaction force pairs. A gunpowder explosion creates hot gases which expand outward

allowing the rifle to push forward on the bullet. Consistent with Newton's third law of motion,

the bullet pushes backwards upon the rifle. The acceleration of the recoiling rifle is ...

A. greater than the acceleration of the bullet.

B. smaller than the acceleration of the bullet.

Or

C. the same size as the acceleration of the bullet.

Explain your answer.

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Physics

Victoria Barnes

How would you measure the volume of a sponge

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Physics

Laney Wilson

List atleast to conditions that could cause the pressure inside a sealed container of gas to increase

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Physics

Clara

Find the speed of sound in air at 0 ∘C (1100 ft/s) in m/s

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Physics

Abraham

Explain how a mug of tea is heated in a microwave oven. Explain why the tea gets hotter than the mug

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Physics

Keagan Beck

Fa car's power output is increased, its efficiency:

is increased

is decreased

may be either increased or decreased

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Physics

Liam

A particle is moving along a projectile path where the initial height is 96 feet with an initial speed of 16 feet per second. What is the maximum height of the particle?

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Physics

Madilyn Blevins

Explain the scientific theory of plate tectonics by describing how the movement of earths crystal plates cause both slow and rapid changes in earths surface, including volcanic eruptions, earthquakes, and mountain building

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Physics

Imogen

Two trains leave the station at the same time, one heading east and the other west. the eastbound train travels at 80 miles per hour. the westbound train travels at 90 miles per hour. how long will it take for the two trains to be 306 miles apart?

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Physics

Esther Barnes

Calculate the force of friction for a 5kg aluminum block being pulled with constant velocity (uniform motion) across a horizontal steel plank ...?

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Physics

Rush

Which part of a molecule provides energy for life processes

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Physics

Hadley

A hair dryer draws a current of 10 A plugged into a 120 V outlet. What is the resistance of the hair dryer?

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Physics

Kylee Green

Which of the following statements describe the transfer of energy?

-Collisions of atoms causing nuclear reactions

-A car speeding up from 5 mi/hr to 40 mi/hr

-A weightlifter lifting 100 lb. bell bar from his chest to a certain height

-A transformer stepping down the voltage of electricity in power lines

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Physics

Charlize Davies

In the rectangle to the left, if

the perimeter was 90

inches, what would the

value of x be?

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Physics

Bentley

A book is sitting on a shelf that is 3.0 meters off the ground. Kinetic energy is found using the formula 1/2 times mass times speed. Potential energy is found by taking mass times g times height, with g as the constant, 9.8 m/s squared. What is needed to determine the mechanical energy used to move this book?

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