A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.0 cm from the center, at the time 2.0 seconds from the start?
A. 2.0 rad
B. 4.0 rad
C. 6.0 rad
D. 8.0 rad
E. 10.0 rad
A. 2.0 rad
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If two electrons are entangled, then
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A machinist with normal vision has a near point at 25 cm. The machinist wears eyeglasses in order to do close work. The power of the lenses is +4.25 diopters. With these eyeglasses, the near point of the machinist, in cm, is closest to:
A) 12 B) 10 C) 7 D) 15 E) 17
A stone is moving on a rough level surface. It has 24 J of kinetic energy, and the friction force exerted on it by the surface is a constant 0.50 N. What is the maximum distance it can slide?
A) 2.0 m B) 12 m C) 24 m D) 48 m
The Kepler mission uses which technique to detect planet candidates?
A) Radial velocity measurements B) Direct imaging C) Measurements of transverse motion D) Planetary transits