The nuclear reactions in a star's core remain under control so long as
a. luminosity depends on mass.
b. pressure depends on temperature.
c. density depends on mass.
d. weight depends on temperature.
e. temperature depends on mass.
B
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If a quasar has a recessional velocity of 2.7x 105 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/sec)/Mpc to see what arithmetic process you need to do on a calculator
a. 50 km/sec/Mpc b. 9.7x 108 (km/sec)Mpc c. 75 km/sec/Mpc d. 0.013 km/sec/Mpc e. 273,600 km/sec/Mpc
Earth spins completely upright like a giant top
a. True b. False Indicate whether the statement is true or false
Suppose we know the value of 
for a simple harmonic oscillator. What further information do we need to know to fix the amplitude A and the initial phase ? in the solution to the simple harmonic oscillator equation? (If more than one item is needed, feel free to indicate more than one answer.)
A. The oscillating object’s initial position B. The oscillating object’s initial velocity C. The object’s mass D. The oscillation’s period E. The spring’s spring constant F. We do not need additional information. G. The oscillating object’s initial(position+velocity)
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal to the flux through the other half of the Gaussian surface. This is
a. never true. b. never false. c. true whenever enclosed charge is symmetrically located at a center point, on a center line, or on a centrally placed plane. d. true whenever no charge is enclosed within the Gaussian surface. e. true only when no charge is enclosed within the Gaussian surface.