If no force is acting on an object, the object is
A. at rest.
B. slowing down.
C. moving with a constant velocity.
D. at rest or moving with a constant velocity.
D. at rest or moving with a constant velocity.
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The intensity of solar radiation near the earth is 1.4 kW/m2. What magnitude force does this radiation exert when it strikes at right angles to a 5.0-m2 perfectly reflecting solar panel of an artificial satellite orbiting the earth?
(c = 3.0 × 108 m/s)
Which of the following can actually escape from inside a black hole's event horizon?
A) neutrinos B) electrons C) very high energy gamma-rays D) gravitons E) None of the above
Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.10 s
What was the speed of the ball at as it passed the top of the flagpole? A) 6.40 m/s B) 16.2 m/s C) 17.6 m/s D) 29.0 m/s E) 33 m/s
A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)
A) 1.5 × 1022 B) 5.1 × 1022 C) 1.8 × 103 D) 8.1 × 103 E) 1.0 × 1023