You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration
a. always point in the same direction.
b. always point opposite to each other.
c. sometimes point in the same direction, and other times point opposite to each other.
d. depend on the way the ball is thrown.
e. depend on the mass of the ball.
c
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An outcome of universal gravitation is that
A) planets aren't cubes with sharp corners. B) its discovery prompted other laws of nature. C) it provided prediction and discovery of planets. D) all of the above
State the law of reflection
What will be an ideal response?
A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 Pa. What is the change in length of the cable caused by the car?
A) 6.7 mm B) 6.7 cm C) 3.3 mm D) 3.3 cm E) 3.3 m
If you drove day and night without stopping for one year without exceeding the legal highway speed limit in the United States, the maximum number of miles you could drive would be closest to:
a. 8 700. b. 300 000. c. 500 000. d. 1 000 000. e. 32 000 000.