Today most scientists favor the capture theory of the Moon's origin, since it would explain why the Moon still orbits in the ecliptic plane, as do other planets
Indicate whether the statement is true or false
FALSE
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How is the refractive power, P, of a lens related to its focal length, f?
A. P = f B. P = 1/f C. P = 2*f D. P = f2
Which of the following choices is not a way by which we can study the inside of the Sun?
A) We can probe the interior of the Sun by studying the vibrations in its photosphere. B) We can make a computer model of the Sun's interior that allow us to predict the observable properties of the Sun. C) We can send a space probe into the Sun's photosphere. D) We can study solar neutrinos.
Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities?
a. velocity b. average velocity c. speed d. displacement
A heavy box is located in the center of the cargo hold of a train. There are no other boxes or items in the cargo hold and there are no straps holding the box down. The train accelerates along the track in the northward direction. The direction of the friction force exerted by the floor of the cargo hold on the box is
1.upward. 2.none; no friction force exists because the box is not sliding. 3.to the north. 4.to the south.