If a net force is applied to an object, what is guaranteed to change?
A) the object's momentum
B) the object's speed
C) the object's direction of motion
D) the object's mass
E) the object's weight
A) the object's momentum
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It is impossible to use appropriate "run-of-stream" turbines to capture tidal energy
What will be an ideal response?
Is there any place on Earth where we can see stars rise in the west and set in the east (rather than rising in the east and setting in the west)? Why or why not?
A) yes, in the Southern Hemisphere, because the sky appears backward there B) yes, on Earth's equator, because it is halfway between the poles C) no, because the rising and setting of stars is caused by Earth's west to east rotation D) no, because the stars that rise in the west and set in the east are too dim to be seen by the naked eye
Suppose unlike Chelyabinsk, the next major asteroid impact we experience is more devastating. Why might this be?
A) The asteroid is larger in size. B) It has a more vertical trajectory, and is therefore less likely to break up in the atmosphere due to friction. C) It hit water, which will cause a world-wide tsunami. D) Both A and B
Which of the following are characteristics of a mass in simple harmonic motion? I. The motion repeats at regular intervals. II. The motion is sinusoidal. III. The restoring force is proportional to the displacement from equilibrium
A) I and II only B) I and III only C) II and III only D) all of the above E) none of the above