A playground merry-go-round of radius 0.7 m has a moment of inertia 199 kg.m and is rotating at 5rev/min about a frictio

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A Playground Merry Go Round Of Radius 0 7 M Has A Moment Of Inertia 199 Kg M And Is Rotating At 5rev Min About A Frictio 1 (51.42 KiB) Viewed 41 times

A playground merry-go-round of radius 0.7 m has a moment of inertia 199 kg.m and is rotating at 5rev/min about a frictionless vertical axle. Facing the axle, a 34 kg child hops onto the merry-go-around, and manages to sit down on the edge. What is the new angular speed of the merry-go-round? b. 4.61 rev/min C. 3.35 rev/min d. 6.75 rev/min a. 8.94 rev/min 18. A toy cart moves with a kinetic energy of 90 J. If its speed triples, what is its kinetic energy? b. 10) C. 810) 19. If you move an object horizontally with a horizontal force of 25 N and a vertical force of 10 N for a distance of 2 m, the work done is. a. 30 d. 270) a. 70 b. 50 C. 203 d. 60) 20. A 5000 kg truck running at a speed of 40 m/s rear-ended a 1000 kg car moving at 30 m/s. The speed of the coupled vehicles is a. 38.3 m/s b. 35.0 m/s c. 25.0 m/s d. 33.8 m/s 21. x = (5.2 cm) sin (8.Ortt). What is the period of this motion? a. 0.50 s b. 4.00 c. 2.00 s d. 0.25 s 22. An object has a weight of 450 N in water and a volume of 4.0 x 102m', what is the weight of the object in air (p = 1000 kg/m)? a. 58 N b. 842 N c. 254 N d. 40 N