A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubled, the time required to stop would
A) double as well.
B) decrease by a factor of two.
C) stay the same.
D) quadruple.
E) decrease by a factor of four.
A
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A. Yes B. No
A neutron carries a negative charge
Indicate whether the statement is true or false
When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation. b. can be decreased by shifting mass out away from the axis of rotation. c. can be increased by shifting mass in toward the axis of rotation. d. can be decreased by shifting mass in toward the axis of rotation. e. cannot be changed except by friction at the point of contact.
When we use an analogy that represents the expanding universe with the surface of an expanding balloon, what does the inside of the balloon represent?
A) The inside of the balloon does not represent any part of our universe. B) the center of the universe C) the entire universe D) regions of the universe beyond the Milky Way Galaxy