Two Styrofoam balls, of radii R and 2R, are released simultaneously from a tall tower. Which will reach the ground first?
A) The result will depend on the atmospheric pressure.
B) the larger one
C) Both will reach the ground simultaneously.
D) the smaller one
B
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The interior of a large mass of food in a microwave oven must be heated mainly by
a. radiation. b. conduction. c. convection. d. radioactivity.
A wheel having a moment of inertia of 5.00 kg ? m2 starts from rest and accelerates under a constant torque of 3.00 N ? m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
A) 57.6 J B) 64.0 J C) 78.8 J D) 122 J
Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground?
a. 28 m/s b. 14 m/s c. 20 m/s d. 40 m/s e. 780 m/s
A uniform disk has a mass of 3.7 kg and a radius of 0.40 m. The disk is mounted on frictionless bearings and is used as a turntable. The turntable is initially rotating at 30 rpm
A thin-walled hollow cylinder has the same mass and radius as the disk. It is released from rest, just above the turntable, and on the same vertical axis. The hollow cylinder slips on the turntable for 0.20 s until it acquires the same final angular velocity as the turntable. What is the final angular momentum of the system? A) 0.93 kg • m2/s B) 1.1 kg • m2/s C) 1.3 kg • m2/s D) 1.6 kg • m2/s E) 1.9 kg • m2/s