An object of moment of inertia I about some axis experiences a torque τ about that same axis. What is the relationship between these quantities and the angular acceleration α?
(a) τ = Iα
(b) α = τ/I
10. Wheels in the shape of a thin-walled hoop and in the shape of a uniform solid cylinder are released from rest at the top of an inclined plane at the same time. Which wheel arrives at the bottom first?
(a) the thin-walled hoop
(b) the uniform solid cylinder
11. Is a pound of butter on the Earth the same amount as a pound of butter on the Moon?
(a) Yes
(b) No
12. A rocket is fired from the Earth's surface in a direction perpendicular to it and with the escape speed for the Earth. Neglecting other celestial bodies, when the rocket is very far away from the Earth (i.e., close to infinity), its speed is
(a) zero
(b) greater than zero
13. A glider is attached to a horizontal spring and oscillates on a horizontal, frictionless air track with amplitude A. At what point is the glider's acceleration the greatest in magnitude?
(a) When the spring displacement x is zero.
(b) When the spring displacement magnitude |x| is equal to A
(c) none of the above
14. What is the angular frequency ω of an ideal pendulum with string length 2.45 m?
(a) 4.0 rad/s (b) 2.0 rad/s (c) 1.0 rad/s (d) none of the above
15. What is the period of the pendulum in the previous problem?
(a) 4.0 s (b) 6.33 s (c) 3.14 s (d) none of the above
16. A certain wave is described by y(x,t) = (5.00 mm)cos(2πx - t), where x is in meters and t is in seconds. What is the amplitude?
(a) 2.50 mm (b) 5.00 mm (c) 10.0 mm (d) nota
17. In the previous problem, what is the wavelength?
(a) 1.00 m (b) 2.00 m (c) 4.0 m (d) nota
18. In the previous problem, what is the frequency?
(a) 1.00 Hz (b) 0.50 Hz (c) 2.00 Hz (d) nota
19. In the previous problem, in what direction does the wave move?
(a) Positive x-direction (b) Negative x-direction