Relative to an initial height, an object raised twice as high has a gravitational potential energy
A) half as much
B) twice as much.
C) four times as much.
D) need more information
Answer: B
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The Moon does not crash into Earth because
A) Earth's gravitational field is relatively weak at the Moon. B) gravitational pull of other planets keeps the Moon up. C) Moon has a sufficient tangential speed. D) Moon has less mass than Earth. E) none of the above
The speed of light is given by the value of
A.
B.
.C.
.D.
.E.
.Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag
a. Both baseballs hit the ground at the same time. b. Both have the same vertical component of velocity as they reach impact. c. The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are both in the air. d. The horizontally-released ball has a greater speed than the other ball for the whole trip.
If in a gas the opacity is high, then energy transport is by _____________
a. conduction b. convection c. radiation d. All of the other choices are correct.