Answer the following statement(s) true (T) or false (F)
1. A car moves backward 10 m in 2 s at a steady rate. The car’s speed is therefore –5 m/s.
2. An object is moving at a constant velocity. This means that an interaction must be delivering momentum to the object at a constant nonzero rate.
3.A bicyclist rounding a curve at a constant speed is receiving a nonzero net flow of momentum.
4. A human being’s weight could be 150 kg.
5. Suppose a moving cart (cart A) hits an identical cart (cart B) at rest. Cart B remains at rest after the collision, and cart A rebounds with a speed equal to its original speed. Cart B must have participated in some other interaction during the collision process,
1. FALSE
2. FALSE
3. TRUE
4. FALSE
5. TRUE
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a. conduction c. convection b. radiation d. vaporization
The velocity vector at a point in a fluid flow is given by 5i + 12j. The unit vector which is perpendicular to the streamline passing through the point is:
(A) (?12i + 5j)/13 (B) (?12i ? 5j)/13 (C) (5i + 12j)/13 (D) (?5i + 12j)/13
A sound level of 93 dB is how many times as intense as one of 73 dB?
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