An electron gun sends electrons through a region with an electric field of 
for a distance of 2.5 cm. If the electrons start from rest, how long does it take for the electrons to traverse the gun?
A. 1.1 ns
B. 1.1 ?s
C. 2.2 ns
D. 2.2 ?s
E. 4.4 ns
E. 4.4 ns
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The glare seen from water in a lake is largely
A) horizontally polarized. B) vertically polarized. C) nonpolarized.
A 2500-kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 6.00 m/s. What was the mass of the struck car?
a. 1730 kg c. 1200 kg b. 1670 kg d. 1070 kg
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 gas-filled vertical cylinder, closed at the bottom end, is fitted at the top with a piston that can move freely. The mass of the piston is 10.0 kg, and the initial height of the piston above the bottom of the cylinder is 25 cm
A mass of 8.0 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature of the ideal gas is kept constant? A) 12 cm B) 13 cm C) 14 cm D) 15 cm E) 16 cm