A car of mass m1 traveling at velocity v passes a car of mass m2 parked at the side of the road. The momentum of the system of two cars is
A.
B.
C.
D.
E.
Answer: B
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The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 4.0 m?
A. 6.0 J
B. 8.0 J
C. 10 J
D. 12 J
E. 14 J
Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about ________
A) 10 billion years ago B) 10-45 seconds after the Big Bang C) one ten-billionth of a second after the Big Bang D) 380,000 years after the Big Bang
Emission nebulae like M42 occur only near stars that emit large amounts of
A) infrared heat. B) X-rays and gamma rays. C) microwaves. D) ultraviolet radiation. E) visible light.
When a 6.00-?F air-filled capacitor has a charge of ±40.0 ?C on its plates, how much potential energy is stored in this capacitor?
A) 103 ?J B) 113 ?J C) 123 ?J D) 133 ?J E) 143 ?J