What percentage of the solar nebula's mass consisted of rocky material?
A) 0 percent
B) 0.4 percent
C) 2 percent
D) 20 percent
E) 80 percent
B
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If 30 kJ of heat flows into a system and the internal energy increases by 15 kJ, then what is the work done by or on the system?
A. +85 kJ B. +65 kJ C. -65 kJ D. +15 kJ E. -15 kJ
Photon Energy: An 84-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J ? s)
A. 1.3 × 1032 B. 2.9 × 1024 C. 6.3 × 1012 D. 1.4 × 1015
If ?1 = 4.0 V, ?2 = 12.0 V, R1 = 4 ?, R2 = 12 ?, C = 3 ?F, Q = 18 ?C, and I = 2.5 A, what is the potential difference Va?Vb?
A. ?30 V B. 30 V C. 5.0 V D. ?5.0 V E. ?1.0 V
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
a. Bx is positive. b. Bz is positive. c. By is negative. d. By is positive. e. Bx is negative.