physicsexam2

physicsexam2 - 1 How large a force is required to...

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Unformatted text preview: 1. How large a force is required to accelerate a 1600 kg car from rest to a speed of 25 m/s in a distance of 200 m? Answer: 2500 N 2. A horizontal force of 40 N pushes an object of mass 5.0 kg up an inclined plane through a distance of 1.6 m measured along the plane. The plane is inclined at an angle of 30˚ to the horizontal. Neglect friction and use g = 10 m/s 2 . Answer: 15J 3. A force of 15 N applied to a spring stretches it by 4 cm. What is the potential energy of the spring in the stretched position? Answer: 0.3 J 4. A 20-kg object is resting at the top of a table 1.6 m above ground level. What is the change in the gravitational potential energy of this object? Use g = 10 m/s 2 . Answer: 1420 J 5. A 500-kg cannon fires a 4.0-kg projectile with a velocity of 500 m/s relative to the A 500-kg cannon fires a 4....
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This note was uploaded on 03/24/2009 for the course PHYS 104 taught by Professor Pengyi during the Fall '08 term at UNC.

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physicsexam2 - 1 How large a force is required to...

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