# quiz4Ab - Physics 1A- 9 AM class Quiz # 4 Nov. 30, 2007...

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Physics 1A- 9 AM class Quiz # 4 Nov. 30, 2007 Prof. Jose Onuchic MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball? A) 3.5 N B) 30 N C) 3.0 N D) 133 N E) 60 N 2) Geosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth's center. Their angular velocity at this height is the same as the rotation of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1 500-kg satellite at this height? Hint: recall that force is related to centripetal acceleration A) 457 N B) 85 N C) 510 N D) 333 N E) 404 N 3) A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s 2 . What is the centripetal acceleration of a point on the outer edge of the tire after 5.0 s?

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## This note was uploaded on 10/13/2010 for the course PHYS physics 1a taught by Professor Jose during the Fall '10 term at San Diego.

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quiz4Ab - Physics 1A- 9 AM class Quiz # 4 Nov. 30, 2007...

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