A 120 N horizontal force is applied to a 4.00 kg box. The box moves a horizontal distance of 8.00 meters. The change in the kinetic energy of the box is
A. 960 J.
B. 875 J.
C. 821 J.
D. 765 J.
E. 633 J.
A. 960 J.
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Which of the following comparisons between low-mass stars and high-mass main-sequence stars is true?
A) Low-mass stars are hotter and more luminous than high-mass stars. B) Low-mass stars are hotter but less luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars have the same temperature and luminosity as high-mass stars. E) Low-mass stars are cooler and less luminous than high-mass stars.
A uniform electric field, with a magnitude of 600 N/C, is directed parallel to the positive x axis. If the potential at x = 4.0 m is 1000 V, what is the potential at x = 2.0 m?
a. -800 V c. 2800 V b. 2200 V d. 1600 V
The first solenoid has 2 times the diameter, 2 times the number of turns, and 2 times the length of the second solenoid. Which solenoid has the greater inductance and by what factor?
a. the first solenoid by a factor of 8 c. the first solenoid by a factor of 16 b. the second solenoid by a factor of 8 d. the second solenoid by a factor of 32
How much of the sky is north of the celestial equator?
a. less than one-half, because of the tilt of the equator to the ecliptic plane b. more than one-half, because of the precession of the poles c. exactly one-half d. all of the night sky