A 500-W device is connected to a 120-V ac power source. What is the peak voltage across this device?
A)
4.2 V
B)
5.9 V
C)
120 V
D)
150 A
E)
170 V
E
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The metric prefix that means one-hundredth (1/100) is
a. kilo-. b. centi-. c. mega-. d. milli-.
What is the Sun made of?
A) 100 percent hydrogen and helium B) 50 percent hydrogen, 25 percent helium, 25 percent other elements C) 70 percent helium, 28 percent hydrogen, 2 percent other elements D) 70 percent hydrogen, 28 percent helium, 2 percent other elements E) 98 percent hydrogen, 2 percent helium and other elements
A parachutist jumps out of an airplane and opens her parachute. She then floats downward at a constant rate. Why is she not accelerating?
A. The parachutist exerts a gravitational pull on Earth that is equal to its pull on her. B. As she falls, she is weightless and therefore cannot accelerate. C. The parachute has very little mass, so its inertia is negligible. D. She is accelerating, but gravity's pull is weak at high altitudes. E. The parachute provides an upward force to balance gravity, so the net force is zero.
A football kicker is attempting a field goal from 44m out. The ball is kicked and just clears the lower bar with a time of flight of 2.9s If the angle of the kick was 45°, what was the initial speed of the ball, assuming no air resistance?
A) 39 m/s B) 2.2 m/s C) 21.5 m/s D) 19.7 m/s