1. A 75 kg skier starts with an initial speed of 2 m/s down a 40 m high ramp. They launch off a ramp that is 8 m above the ground. (a) Determine the skier’s velocity when launching off the ramp. (b) How much energy is lost to friction if the skier’s launch velocity is 18 m/s? 2. A tow truck uses a chain to pull a 1250 kg car out of a ditch using a cable-winch system. The car is lifted 2 m off the ground. (a) If the efficiency of the system is 72%, what force did the cable-winch system exert to lift the car? (b) If it took 90 seconds to lift the car off the ground, what was the power exerted by the cable-winch system?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
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1. A 75 kg skier starts with an initial speed of 2 m/s down a 40 m high ramp. They launch off a ramp that is
8 m above the ground.

(a) Determine the skier’s velocity when launching off the ramp.
(b) How much energy is lost to friction if the skier’s launch velocity is 18 m/s?

 

2. A tow truck uses a chain to pull a 1250 kg car out of a ditch using a cable-winch system. The car is lifted
2 m off the ground.

(a) If the efficiency of the system is 72%, what force did the cable-winch system exert to lift the car?

(b) If it took 90 seconds to lift the car off the ground, what was the
power exerted by the cable-winch system?

40 m
5.00 m
8 m
Transcribed Image Text:40 m 5.00 m 8 m
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