If Hubble's constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?
a. 4100 Mpc
b. 0.014 Mpc
c. 67 Mpc
d. 74 Mpc
e. 300,000 Mpc
A
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Standing Waves on a String: Standing waves of frequency 17 Hz are produced on a string that has a mass per unit length of 0.0160 kg/m. To what tension must the string be stretched between two supports if adjacent nodes in the standing wave are to be 0.87 m apart?
Fill in the blank(s) with the appropriate word(s).
The rotational velocity of a 45 rev/min phonograph record in rad/s is approximately
A. 0.75 rad/s. B. 15.7 rad/s. C. 283 rad/s. D. 45 rad/s. E. 4.7 rad/s.
A 400-g piece of metal at 100°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup? A) 1960 J/(kg?K) B) 2830 J/(kg?K) C) 3420 J/(kg?K) D) 3780 J/(kg?K) E) 4280 J/(kg?K)
The hydrogen lines in spectral type A stars
a. are most narrow for supergiants. b. are most narrow for main-sequence stars. c. can not be used to estimate the luminosity of the star. d. are very weak and difficult to see. e. are useful in determining the apparent magnitude of the star.