Which of the following sequences correctly describes the stages of life (from beginning to end) for a low-mass star?
A) red giant, protostar, main-sequence, white dwarf
B) protostar, main-sequence, red giant, white dwarf
C) white dwarf, main-sequence, red giant, protostar
D) protostar, main-sequence, white dwarf, red giant
E) protostar, red giant, main-sequence, white dwarf
B) protostar, main-sequence, red giant, white dwarf
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If a light bulb has half the resistance of a 110-W light bulb, what would be its wattage? Assume both bulbs are attached to the same 160-V circuit
a. 220 W b. 55 W c. 1.5 W d. 330 W e. More information is needed.
A 6.00-mC charge is placed at the origin and a second charge is placed on the x axis at x = 0.300 m. If the resulting force on the second charge is 6.40 N in the negative x direction, what is the force on the charge at the origin?
a. 6.40 N in the negative x direction b. 0 N c. 6.40 N in the positive x direction d. not able to be determined until the second charge is known
A 2.00-kg mass oscillates on the end of a spring with spring constant 12.0 N/m
Its amplitude of oscillation decreases from 10.0 cm to 1.0 cm in 2.00 s. What is the angular frequency at which this oscillator will have its peak amplitude? A) 7.28 s-1 B) 0.622 s-1 C) 2.45 s-1 D) 2.16 s-1 E) 0.311 s-1
Materials A, B, and C have R values of 1, 4, and 8 ft2-°F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____
a. 1.5 b. 2.5 c. 4.0 d. 7.0 e. 80 Btu/hr