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## Increased Incline

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A box is stationary on an inclined plane. As the angle of the inclined plane – determined by measuring from the horizontal – increases, the normal force:

## Pull On The Rope

What force will the boy need to pull on the rope to lift the weight?

## Newton’s Laws

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Which of Newton’s Laws of Motion is best described as “For every action there is an equal and opposite reaction.”?

## Planet and Moon

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A planet with a moon of 1/4 its mass are 10,000 km apart. At what distance from the planet will the gravitational pull of the planet and moon be equal?

## Force and Velocity

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A 2.0 kg body is acted on by a 10-N force. If the body is initially at rest, what will be its velocity after 5 seconds?

## Penny Toss

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A penny is thrown horizontally with an initial speed of 20 m/s. How far will it drop in 5 seconds? (Ignore air resistance).

## Frictionless Roof

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Which of the following statements accurately describes the magnitude of the normal force (N) on a sled sliding down a frictionless roof that is inclined at x degrees with the horizontal?

## Falling for You

The ribcage can withstand 500 kg of weight, in less than 1 second. Assuming no air resistance, what is the minimum height a person would need to free-fall in order to break their ribs, if they weighed 50 kg?

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Radioactive isotopes can sometimes emit or radiation, which can be very dangerous to people. However, they can be very useful for medical purposes, so long as the proper quantity is used. If the safety standard for a radioactive injection of phosphorus requires that less than 0.01g remains in the body after 90 days after the injection, what is the maximum initial dose? The half-life of phosphorous is 14.29 days.

## Airplanes

A baby can easily surpass 100 decibels. Which of the following part of a sound wave is increased to create such a loud cry?