A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg?m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each having a mass of 60 kg are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s
B) 0.40 rad/s
C) 0.60 rad/s
D) 0.80 rad/s
E) 0.67 rad/s
B
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A car enters a level, unbanked semi-circular hairpin turn of 100-m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is ? = 0.800. If the car maintains a constant speed of 28 m/s, it will
A. attempt to dig into the road surface. B. tend to veer toward the center of the semicircle. C. arrive safely at the end of the semicircle. D. tend to veer toward the outside of the circle. E. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
An object's angular momentum changes by 10 kg-m2/s in 2.0 s. What magnitude average torque acted on this object?
A) 2.5 N-m B) 40 N-m C) 10 N-m D) 5 N-m E) 20 N-m
Place the following items in order of actual physical size, from smallest to largest
A) planets and stars are about the same size, solar system, galaxy B) star, planet, solar system, galaxy C) star, planet, galaxy, solar system D) planet, star, galaxy, solar system E) planet, star, solar system, galaxy
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Linear momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved. d. none of the above