The net force on an object is
A) most often its weight.
B) the combination of all forces acting on it.
C) the force of friction acting on it.
Answer: B
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The position, x, of an object is given by the equation x = A + Bt +Ct2, where t refers to time. What are the dimensions of A, B, and C?
A) distance, distance, distance B) time, time, time C) distance, time, time2 D) distance, distance/time, distance/time2 E) distance/time, distance/time2, distance/time3
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision.
A. 15 m/s B. 7.0 m/s C. 8.0 m/s D. 23 m/s E. 11 m/s
Climate models predict that due to the melting of the polar ice caps, sea levels by the end of this century
A) will remain stable due to increased evaporation into the Earth's atmosphere B) may rise by several tens of meters C) will actually fall by several inches due to increased evaporation into the Earth's atmosphere D) may rise by several meters
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force is proportional to the magnitude of the charge of the object on which the force is exerted.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forces