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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If the speed of an electron increases, its de Broglie wavelength
a. increases c. stays the same b. decreases d. may increase or decrease
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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