Ice will float in water unless it is pushed or pulled under by an external force. Assume that someone pushes on a 3 cm3 cubic block of ice such that it is 0.5 m under water. Instead, to hold the ice at a point at which it is only just submerged requires a pushing force that is
1.less.
2.the same.
3.more.
4.impossible to determine.
2
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Space and time
A) have always existed. B) were created at some time before the big bang. C) were created by the big bang. D) were created at some time after the big bang.
Two billiard balls have velocities of 2.0 m/s and -1.0 m/s when they meet in an elastic head-on collision. What is the final velocity of the second ball after collision?
a. +2.0 m/s c. -0.5 m/s b. -1.0 m/s d. +1.0 m/s
As an interstellar cloud of hydrogen gas shrinks in size, its rate of rotation
A) increases, because its total energy is conserved. B) decreases, because the force of gravity strengthens as the cloud shrinks. C) increases, because its angular momentum is conserved. D) decreases, because its angular momentum is conserved. E) increases, because the force of gravity strengthens as the cloud shrinks.
Eternal Inflation refers to
A) the possibility that our universe is only a patch of a greater universe and that the process of universe spawning will continue forever. B) the observation that cosmic inflation could eventually curve back in on itself, causing its opposite: the compression of space. C) cosmic inflation inflating itself such that its own inflation is self-generating. D) the presence of a distinct beginning of time.