An external heat source supplies thermal energy through heating to a system at a rate of 187 W as the environment does work on the system at a rate of -131 W. At what rate is the internal (thermal) energy of the system changing?
A) -56 W
B) 320 W
C) 56 W
D) 190 W
E) -320 W
C
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Earth's atmosphere is opaque to waves that are concentrated in the
A) infrared part of the spectrum. B) visible part of the spectrum. C) entire electromagnetic spectrum.
Which of the following is the origin of almost all the large moons around the jovian planets?
A) They are captured planets. B) They are captured asteroids. C) They were formed by giant impacts. D) They were formed by condensation and accretion in a disk of gas around the planet. E) They are captured comets.
Two water waves, call them X and Y, have the same amplitude but different wavelengths: X has a larger wavelength than Y. Regarding their frequencies and their energies,
A) Y has the larger frequency and carries the greater energy. B) Y has the larger frequency and X carries the greater energy. C) X has the larger frequency and Y carries the greater energy. D) X has the larger frequency and carries the greater energy. E) Y has the larger frequency and the two waves carry the same energy.
A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 ?N b. 16 ?N c. 18 ?N d. 12 ?N e. 0 ?N