7. a ring, disk, and solid ball have equal masses androll downa hill at the sam

Question

7. a ring, disk, and solid ball have equal masses androll downa hill at the sam etime which reaches it first? a. ring, b. disk c., ball d. tie 8. a ring and disk with equal masses roll down a hill atthesame time which reaches it first? a. ring b. disk   c. tie 9. suppose you put a larger diamter tires on your cr.. yourspeedometer will read a. high b. low c. actual speed 7. a ring, disk, and solid ball have equal masses androll downa hill at the sam etime which reaches it first? a. ring, b. disk c., ball d. tie 8. a ring and disk with equal masses roll down a hill atthesame time which reaches it first? a. ring b. disk   c. tie 9. suppose you put a larger diamter tires on your cr.. yourspeedometer will read a. high b. low c. actual speed

Explanation / Answer

The problem must assume that the diameters of the objects areequal (and density uniform) or the question is meaningless. Moment of inertia      ring        =   M R2                                 disk        = 1/2 MR2                                 ball         = 2/5M R2 Since the same force acting at the center of gravity is thesame for all objects, the ball will reach the bottom first, then the disk, and finally the ring If you put larger tires on a car then the speedometer willmeasure fewer revolutions per distance traveled and thus indicate a smaller speed Since the same force acting at the center of gravity is thesame for all objects, the ball will reach the bottom first, then the disk, and finally the ring If you put larger tires on a car then the speedometer willmeasure fewer revolutions per distance traveled and thus indicate a smaller speed

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