Must we see both spectral lines splitting to find a spectroscopic binary?
What will be an ideal response?
No, in some cases the second object is much fainter, but its gravity still causes the primary to move back and forth as both orbit their common center of mass.
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The substances that are formed by a chemical reaction are called the
a. products. b. reactants. c. chemicals. d. precipitates.
Which of the following statements is true of giant stars?
A) Supergiant stars are 1000 times smaller than the Sun's diameter. B) They have more surface area than main-sequence stars of the same temperature. C) They have very low luminosities because of their big size. D) Red dwarfs are giant stars that are hot and have high luminosities.
A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = ?30 cm. What is the acceleration of the particle?
A. ?7.3 cm/s2 B. ?8.9 cm/s2 C. ?11 cm/s2 D. ?15 cm/s2 E. ?13 cm/s2
The circuit power factor of an RC circuit is 0.620. The rms value of the ac voltage applied to this signal is 120 V and the impedance is 200 ?. What is the average power of this circuit?
A) 60.0 W B) 0.620 W C) 124 W D) 89.2 W E) 44.6 W