A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
a. at the top of the parabola
c. where it is about to impact
b. just when it has started upward
d. nowhere
D
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If an electron is accelerated from rest through a potential difference of 1 200 V, find its approximate velocity at the end of this process. (e = 1.6 × 10^?19 C; me = 9.1 × 10^?31 kg)
a. 2.5E+7 m/s b. 2.1E+8 m/s c. 2.1E+7 m/s d. 4.2E+7 m/s e. 1.8E+8 m/s
On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie
A) at the top left. B) at the top right. C) close to the Sun, near the center. D) at the lower left. E) at the lower right.
If a reactor produces an average power of 1000 MW for a year, how much mass is turned into energy?
A) 0.35 kg B) 1.75 kg C) 384 kg D) 1.1 × 108 kg E) 3.3 × 108 kg
A simple pendulum of length 2.00 m is used to measure the acceleration of gravity at the surface of a distant planet. If the period of such a pendulum is 7.00 s, what is the acceleration of gravity?
A) 7.89 m/s2 B) 6.78 m/s2 C) 1.61 m/s2 D) 0.513 m/s2 E) 17.8 m/s2