A 20.0 kg hollow cylinder (I = 
) has a diameter of 50.0 cm. The cylinder is rolling down a hill with a velocity of 5.00 m/s. The rotational kinetic energy of the rolling cylinder is
A. 225 J.
B. 200 J.
C. 175 J.
D. 150 J.
E. 250 J.
E. 250 J.
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Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Mort's velocity relative to Velma is
A) 4 m/s southward. B) 8 m/s northward. C) 4 m/s northward. D) zero. E) 8 m/s southward.
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^-23 m. c. 1.84 × 10^-14 m. d. 1.80 × 10^-13 m. e. 2 m.
A circuit breaker is connected in ______________ in a circuit
Fill in the blank(s) with correct word
The motion of a piston in an auto engine is simple harmonic. If the piston travels back and forth over a distance of 10 cm, and the piston has a mass of 1.5 kg, what is the maximum speed of the piston and the maximum force acting on the piston when the engine is running at 4 200 rpm?