Half-way to the center of a planet of uniform density, your weight compared to that at the surface would be
A) one-quarter.
B) one-half.
C) three-quarters.
D) the same as at the surface.
E) zero.
Answer: B
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According to general relativity, what is a black hole?
A) an object that cannot be seen B) a place where light travels slower than the normal speed of light C) a place where the strength of gravity is infinite D) a hole in the observable universe
A 7.50-kg bowling ball strikes a 5.20-kg pin. The pin flies forward with a velocity of 4.00 m/s; the ball continues forward at 5.50 m/s. What was the original velocity of the ball?
a. 11.3 m/s b. 8.27 m/s c. 0.128 m/s d. 1.34 m/s e. 4.61 m/s
The part of the visible spectrum most absorbed by water is
A) infrared. B) red. C) cyan. D) all about equally.
The diameter of the Moon is 3.78 × 106 m. It subtends an angle of 0.00982 radians at the surface of Earth. How far is the Moon from Earth?
What will be an ideal response?