A frictionless pendulum released from 65 degrees with the vertical will vibrate with the same frequency as if it were released from 5 degrees with the vertical because the period is independent of the amplitude and mass
A) True B) False
B
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A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. What is the change in mechanical energy done on the system between A and B by the force of friction?
A. ?8.9 J B. ?7.3 J C. ?8.1 J D. ?6.6 J E. ?24 J
A horizontal force acts on a block that is initially at rest but free to move across a smooth horizontal surface. The work done by this force ________ (increases; does not change; decreases) the kinetic energy of the block.
Fill in the blank(s) with the appropriate word(s).
If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
Graphical Analysis: The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at time t = 0. 
At time T, what is true of the distances traveled by the vehicles since time t = 0?
A. They will have traveled the same distance. B. The truck will not have moved. C. The car will have travelled further than the truck. D. The truck will have travelled further than the car.