Two particles (m1 = 0.20 kg, m2 = 0.30 kg) are positioned at the ends of a 2.0-m long rod of negligible mass. What is the rotational inertia of this rigid body about an axis perpendicular to the rod and through the center of mass?
a. 0.48 kg/m2
b. 0.50 kg/m2
c. 1.2 kg/m2
d. 0.80 kg/m2
e. 0.70 kg/m2
a
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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
In a spectroscopic binary, the star whose lines shift the most weighs the most
Indicate whether the statement is true or false
A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
a. -500 km/s2 b. -550 km/s2 c. -360 km/s2 d. -520 km/s2 e. -275 km/s2
Energy and Momentum: A 0.140-kg baseball is dropped from rest from a height of 2.20 m above the ground and experiences negligible air resistance as it falls. It rebounds to a height of 1.60 m. What change in the ball's momentum occurs as it rebounds from the ground?
A. 0.117 kg ? m/s upwards B. 0.117 kg ? m/s downwards C. 1.70 kg ? m/s upwards D. 0.350 kg ? m/s upwards E. 0.350 kg ? m/s downwards