(these may have more than one answer) 1. The acceleration of an object in a unif
ID: 2108158 • Letter: #
Question
(these may have more than one answer)
1. The acceleration of an object in a uniform circular motion is bigger in magnitude if the object....
A) moves at the same speed around a smaller circle
B) moves faster around the same circle
C) has a bigger mass but moves at the same speed around the same circle
D) moves at twice the speed around a circle that is twice as big in radius
2. On friction between two given surfaces:
A) the kinetic frictional force is always in the direction opposite to the direction of motion
B) if you slightly push one surface relative to another without actually moving it, the resultant static friction force is always equal to the coefficient of static friction times the normal force.
C) the coefficient of kinetic friction depends on the smoothness of the surfaces
D) the magnitude of the frictional force cannot be bigger than the magnitude of the normal force
3. When a car stops quickly, the front dips down. What force produces the torque responsible for this slight rotation?
A) gravitational force
B) frictional force
C) weight
D) normal force
4. If a body's temp. doubles, its rate of radiation emission will be ____ times as high. If a body's surface triples in area but remains in the same surroundings, its rate of radiation absorption will be ____ times as high.
Explanation / Answer
1. B,D
2. A, B, C ARE TRUE
3.A,B,C,D
4.16 TIMES, 3 TIMES
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