2D Projectile Motion (exam 2)

# 2D Projectile Motion (exam 2) - 2D Projectile Motion...

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2D Projectile Motion Concept Questions CT2D-1. A projectile is fired at an angle θ with initial velocity v 0 from a table a height h above the floor. The projectile strikes the floor with a final speed v given by the formula . What is the correct formula for v x ? A) v 0 cos θ B) v 0 sin θ C) Neither of these Answer: v ox = v 0 cos θ . a x = 0 so v x is constant. Since v x is constant, its value at the end of the flight is exactly the same as its value at the beginning of the flight, which is v 0 cos θ . CT2D-2 . A bullet is fired horizontally from a rifle on the Moon (where there is no air). The initial speed of the bullet when it leaves the gun barrel is v o . Assume that the ground is perfectly level (and endless). Which one, if any, of the following three statements is false ) A ) During its entire flight, the minimum speed of the bullet is v o. B ) The acceleration of the bullet is constant during its flight.

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C ) The time it takes for the bullet to hit the ground increases as v o is increased. OR D ) All of the above statements are true! Answer: the time it takes for the bullet to hit the ground is independent of v
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## This note was uploaded on 05/25/2008 for the course PHYS 2010 taught by Professor Dubson during the Fall '06 term at Colorado.

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2D Projectile Motion (exam 2) - 2D Projectile Motion...

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