1. A 58.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 138 m/s from the top of a cliff 162 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? (Give your answer to at least three significant figures.) J (b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 360 m. How much work has been done on the projectile by air friction? J (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? m/s
1. A 58.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 138 m/s from the top of a cliff 162 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? (Give your answer to at least three significant figures.) J (b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 360 m. How much work has been done on the projectile by air friction? J (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? m/s
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter7: Work, Energy, And Energy Resources
Section: Chapter Questions
Problem 8PE: Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0°...
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1. A 58.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 138 m/s from the top of a cliff 162 m above level ground, where the ground is taken to be y = 0.
(a) What is the initial total mechanical energy of the projectile? (Give your answer to at least three significant figures.) J
(b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 360 m.
How much work has been done on the projectile by air friction? J
(c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? m/s
(b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 360 m.
How much work has been done on the projectile by air friction? J
(c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? m/s
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