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HW 4-solutions

HW 4-solutions - virani(sv2339 HW 4 moura(58650 This...

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virani (sv2339) – HW 4 – moura – (58650) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points One Newton is the force 1. that gives a 1 g body an acceleration of 1 cm/s 2 . 2. that gives a 1 kg body an acceleration of 9.8 m/s 2 . 3. of gravity on a 1 g body. 4. that gives a 1 kg body an acceleration of 1 m/s 2 . correct 5. of gravity on a 1 kg body. Explanation: One Newton is a kg · m / sec 2 , so such a force acting on a 1 kg body gives a 1 m/sec 2 acceleration 002 10.0 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 opponent’s court. Consider the following forces: 1. A downward force of gravity, 2. A force by the hit, and 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, 2, and 3. 2. 2 and 3. 3. 1 only. 4. 1 and 3. correct 5. 1 and 2. Explanation: The forces acting on the tennis ball after it has left contact with the racquet are gravity and air resistance. A force by the hit is no longer acting on the ball. 003 (part 1 of 2) 10.0 points A fast-moving VW Beetle traveling at 60 mph hit a mosquito hovering at rest above the road. Which bug experienced the largest force? 1. They experienced the same magnitude of force. correct 2. the insect 3. Unable to determine 4. the VW Explanation: By Newton’s third law, the forces had the same magnitude, but were in opposite direc- tions.

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HW 4-solutions - virani(sv2339 HW 4 moura(58650 This...

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