Estimate the mass of a nucleus with radius 2.8 ×10-15 m. (1 u = 1.6605 × 10-27 kg)
A) about 7.5 × 10-27 kg B) about 4.7 × 10-26 kg
C) about 2.1 × 10-26 kg D) about 2.3 × 10-26 kg
C
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Which of the following statements is true regarding shock waves?
A) They are predominantly transverse in nature. B) They can be produced by the birth of very hot stars. C) They are also called shear waves. D) They cannot be produced by supernova explosions.
The axes on a Hertzsprung-Russell (H-R) diagram represent
A) luminosity and surface temperature. B) mass and luminosity. C) luminosity and apparent brightness. D) mass and radius.
Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect
a. True b. False Indicate whether the statement is true or false
A 2 500-kg car is moving at 2.30 m/s. How fast must a 1.5-kg toy car be moving so that the two have the same kinetic energy?
a. 61.9 m/s b. 3.97 m/s c. 93.9 m/s d. 6 610 m/s