A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.38 102 m/s from the top of a cliff 160 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? 487960 J (b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 358 m. How much work has been done on the projectile by air friction? -123163.92 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 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.38 102 m/s from the top of a cliff 160 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? 487960 J (b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 358 m. How much work has been done on the projectile by air friction? -123163.92 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
Chapter7: Conservation Of Energy
Section: Chapter Questions
Problem 21P: A 5.00-kg block is set into motion up an inclined plane with an initial speed of i = 8.00 m/s (Fig....
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A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.38 102 m/s from the top of a cliff 160 m above level ground, where the ground is taken to be y = 0.
(a) What is the initial total mechanical energy of the projectile?
487960 J
(b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 358 m. How much work has been done on the projectile by air friction?
-123163.92 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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