If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
a. decreases
c. remains constant
b. increases
d. cannot tell from the information given
D
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An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level will
A) rise. B) fall. C) remain unchanged.
An object is dropped from a helicopter. When it reaches terminal velocity
A) the acceleration finally reaches g. B) gravity no longer acts upon it. C) all of the upward forces add up to zero. D) the total force is zero. E) the acceleration of gravity, g, becomes 0.
Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. B) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. C) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit. D) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?
a. 5.8 m/s b. 2.8 m/s c. 5.4 m/s d. 5.6 m/s e. 11 m/s