A train is moving at constant speed over a certain period of time. Which of the following statements about the train's motion during this period of time must be false? A. The magnitude of the train's velocity is constant.
B. The distance traveled by the train will be a positive, nonzero number.
C. The train's direction of motion may change.
D. The instantaneous speed may be higher or lower than the average speed.

Abug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . what minimum coefficient friction is required so that the bug stays on the turntable?

How is zig zagging a form of acceleration?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)