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Homework 04

# Homework 04 - homework 04 GADHIA TEJAS Due 4:00 am Question...

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homework 04 – GADHIA, TEJAS – Due: Feb 14 2007, 4:00 am 1 Question 1 part 1 of 1 10 points Despite a very strong wind, a tennis player manages to hit a tennis ball with her racquet so that the ball passes over the net and lands in her opponents court. Consider the following forces: 1 - A downward force of gravity. 2 - A force by the ”hit”. 3 - A force exerted by the air. Which of the above forces is (are) acting on the tennis ball after it has left contact with the racquet and before it touches the ground? 1. 1 and 2 2. 2 and 3 3. 1 and 3 4. 1 only 5. 1, 2 and 3 Question 2 part 1 of 1 10 points An elevator is being lifted up an el- evator shaft at a constant speed by a steel cable as shown in the figure be- low. All frictional effects are negligible. steel cable Elevator going up at constant speed In this situation, forces on the elevator are such that 1. the upward force by the cable is greater than the sum of the downward force of gravity and a downward force due to the air. 2. the upward force by the cable is equal to the downward force of gravity. 3. the upward force by the cable is greater than the downward force of gravity. 4. None of these. (The elevator goes up because the cable is being shortened, not be- cause an upward force is exerted on the eleva- tor by the cable.) 5. the upward force by the cable is smaller than the downward force of gravity. Question 3 part 1 of 1 10 points A 1 ton truck provides an acceleration of 4 . 6 ft / s 2 to a 8 ton trailer.

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