A 1.8 kg solid disk pulley of radius 0.11 m rotates about an axis through its center
(a) What is its moment of inertia?
(b) Starting from rest, a torque of 0.22 m-N will produce what angular acceleration?
(a) 1.1 × 10-2 kg ? m2
(b) 20. rad/s2
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A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant velocity?
A) The period does not change. B) The period increases. C) The period decreases. D) The period becomes zero. E) The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
A 10 kg object dropped from a certain window strikes the ground in 4.0 s. Neglecting air resistance, a 5 kg object dropped from the same window strikes the ground in
A. 8.0 s. B. 1.0 s. C. 2.0 s. D. 4.0 s.
Which type of star spends the longest time as a protostar?
A) G star B) M star C) O star D) B star
A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward at constant velocity. The speed of the ball as seen by a stationary observer in the street:
a. is less than that observed inside the bus. b. is the same as that observed inside the bus. c. is greater than that observed inside the bus. d. may be either greater or smaller than that observed inside the bus. e. may be either greater, smaller, or equal to that observed inside the bus.