Prior to 10^–36 seconds, the Universe existed as one unified force
a. True
b. False
Indicate whether the statement is true or false
True
RATIONALE: Although Figure 14-16 shows two combined forces and two separate forces immediately prior to this time, all four forces were united in the early fraction of a second.
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Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show red shifts greater than 6. d. a and b e. a, b and c
Power: A 5.0-V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit. How much energy does the battery have left after powering the circuit for 1.0 h?
A. 16 kJ B. 27 kJ C. 43 kJ D. 41 kJ
Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles
a. Opposite signs. b. Same sign. c. Charges cannot be determined.
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thick-ness t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in the aluminum to that in the copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5