Which of the following quantities is equal to the energy per second generated by the Sun's nuclear reactions?
A) the force of gravity holding the Sun together B) the temperature of the Sun's core
C) the luminosity of the Sun's photosphere D) the temperature at the Sun's photosphere
C
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What is the x-component of a force vector of magnitude 27.0N directed at 73o above the negative y-axis?
A. +7.9N B. -7.9N C. -25.8N D. -8.3N E. +25.8N F. +8.3N
Explain how the resonance among Io, Europa, and Ganymede makes their orbits slightly elliptical
What will be an ideal response?
A star has a parallax of .05". Its distance is
A) 20 parsecs. B) 200 parsecs. C) 66 parsecs. D) 5 light-years. E) 660 light-years.
Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true about these two length measurements?
A) LA > LB B) LA = LB C) LA < LB D) LA could be greater or smaller than LB depending on the direction of the motion.