A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.42 102 m/s from the top of a cliff 146 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? J (b) Suppose the projectile is traveling 100.6 m/s at its maximum height of y = 356 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
A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.42 102 m/s from the top of a cliff 146 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? J (b) Suppose the projectile is traveling 100.6 m/s at its maximum height of y = 356 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
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter6: Energy Of A System
Section: Chapter Questions
Problem 3OQ
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A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.42 102 m/s from the top of a cliff 146 m above level ground, where the ground is taken to be y = 0.
(a) What is the initial total mechanical energy of the projectile?
J
(b) Suppose the projectile is traveling 100.6 m/s at its maximum height of y = 356 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
J
(b) Suppose the projectile is traveling 100.6 m/s at its maximum height of y = 356 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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