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Question

bbcswebdav/pid-4759934-dt-content-rid-14750115 1/courses/PHYS A123 601 201703/PHYS A123 601 201703 a Ama McGraw-Hill Connect " Choose one and only one answer" 1. A wheel that is 0.3m in radius is rolling (without slipping) along the ground at a constant velocity of 10 m/s. How fast is the bottom of the wheel moving? a) 0 m/s b) 7 m/s c) 10 m/s d) 13 m/s e) 20 m/s 2. You are riding a bike up a hill. To generate the most positive torque, you should push down on the pedal when it is at which location? (You are pedaling counter-clockwise). a) Top b) Back c) Front d) Bottom e) All work equaly well 3. A NASA astronaut lands on a mysterious planet that is the mass of the Earth but the radius of the Moon (which is only 25% that of Earth). On this planet the force of gravity is: a) The same as on the Moon b) Between that on the Earth and on the Moon c) The same as on the Earth d) A little bit higher than on the Earth e) Much higher than on the Earth

Explanation / Answer

ans 1

option ( a) is correct

rolling without slipping means pure rolling.in pure rolling velocity of point of contact is equal to velocity of surface where rolling take place...since rolling occurs on GROUND.ground is staniory.therefore velocity of point of contact is also zero..

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