During a short interval of time the speed v in m/s of an automobile is given by

Question

During a short interval of time the speed v in m/s of an automobile is given by v = omega t3, where the time t is in seconds. The appropriate SI units for the constant omega are: A particle's acceleration as a function of time is given by alpha = beta t3. Which of the following expressions possibly describe the position of the particle? Note that beta and lambda are constants. Select all correct answers, and there may be more than one. The graphs show position as a function of time for a particle that moves along the X axis. Select the graph or graphs that represent the motion of a particle whose speed is increasing. A boy twirls a stone at the end of string 1.2 m long in a horizontal circle. A girl twirls a similar stone at the end of string 0.8 m long with the same period as the boy. Which statement about the magnitude of the velocity, v, and centripetal acceleration, a, of the stone is correct? Choose the vector expression that appropriately describes the diagram shown.

Explanation / Answer

A-2

B-1,4

C-3

D-5

E-1

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