We wrap a light, nonstretching cable around a 7.00 kg solid cylinder with diameter of 40.0 cm. The cylinder rotates with negligible friction about a stationary horizontal axis. We tie the free end of the cable to a 15.0 kg block and release the block from rest. As the block falls, the cable unwinds without stretching or slipping. Part A How far will the mass have to descend to give the cylinder 540 J of kinetic energy? Express your answer in meters. h = Im Submit Request Answer Provide Feedback

A wrecking ball swings at the end of a 14.4-m cable on a vertical circular arc. The crane operator manages to give the ball a speed of 13.5 m/s as the ball passes through the lowest point of its swing and then gives the ball no further assistance. Friction and air resistance are negligible. What speed vf does the ball have when the cable makes an angle of 14.5 ° with respect to the vertical? Vf Number i Units

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A net (unbalanced) external force of 100.0 N acts on an object of mass 20.0 kg whose initial speed is 10.0 m/s. The force acts in the opposite direction from the object's motion, and it acts for 1.00 s. What is the object's final speed, in m/s?

A 53.0 kg ice skater is gliding along the ice, heading due north at 4.40 m/s. The ice has a small coefficient of static friction, to prevent the skater from slipping sideways, but μ = 0. Suddenly, a wind from the northeast exerts a force of 4.40 N on the skater. Part A Use work and energy to find the skater's speed after gliding 100 m in this wind. Express your answer with the appropriate units. V = 4.58 0 Part B ☐☐ Amin μA = Submit Previous Answers Request Answer m * Incorrect; Try Again; 4 attempts remaining S ΑΣΦ wwww F What is the minimum value of μ, that allows her to continue moving straight north? 0.00847 ? 2 ?

answer D and E only

4. Two identical masses are suspended by strings wrapped around identical frictionless pulleys, except that a heavy metal ring has been added to one of the pulleys. The masses are released from rest and allowed to fall to the ground. How does the final kinetic energy of the falling mass compare between the two systems? Clearly explain your line of reasoning using physics concepts and equations. m m

A merry-go-round on a playground consists of a horizontal solid disk with a weight of 795 N and a radius of 1.53 m. A child applies a force 50.5 N tangentially to the edge of the disk to start it from rest. What is the kinetic energy of the merry-go-round disk (in J) after 3.05 s? J Submit Answer

A bowling ball of mass 7.24 kgkg and radius 10.5 cmcm rolls without slipping down a lane at 3.30 m/sm/s .     Part A Calculate its total kinetic energy. Express your answer using three significant figures and include the appropriate units.

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