The luminosity of a star is the total amount of energy it radiates each second
a. True
b. False
Indicate whether the statement is true or false
True
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What evidence do we have that the halo population of stars are older than other stars in the galaxy?
A) They are farther away. B) They have higher masses than other stars in the galaxy. C) They have fewer planets. D) They have a smaller proportion of heavy elements. E) They move slower than other stars in the galaxy.
A 120-V rms voltage at 1.00 kHz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.04 A C) 1.84 A D) 1.09 A
Which is the correct expression for rotational kinetic energy?
a. Half of the rotational inertia times the square of the rotational speed. b. The mass times the speed times the radius. c. The mass times velocity. d. Half of the mass times the square of the speed. e. The force times the distance.
If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy