When a star collapses to form a black hole, its mass
A) increases.
B) decreases.
C) remains the same.
Answer: C
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Two ice skaters push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s. What speed does the 60-kg skater acquire?
A) 0.500 m/s B) 0.281 m/s C) 0.375 m/s D) 0.750 m/s E) 0 m/s
A marble moving 1.48 m/s rolls off the top edge of a 125-cm high table in a room where there is no appreciable air resistance and the free-fall acceleration is 9.80 m/s2. Neglect effects of air
(a) How far from the base of the table will it strike the floor? (b) How long will it be in the air?
The free-body diagram below represents a 1500-kg car sitting on a 3000-kg bridge supported at its far ends. The car's position is three quarters of the length L from the left end of the bridge. Identify the one error in the torque equation below:
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If the speed of an electron increases, its de Broglie wavelength
a. increases c. stays the same b. decreases d. may increase or decrease