How can a black hole of a few solar masses be detected?
What will be an ideal response?
Look for a binary system in which one body is not visible conventionally but is a strong X-ray source from mass transfer off the visible companion, and has mass over 3 solar masses, as revealed by the motion of the visible companion.
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If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 
to 
What is the work done by the gas during this expansion?
A. 159 J B. 125 J C. 102 J D. 172 J
Using K = 3/2 kT, what is the average kinetic energy of a He atom at:
(a) 10. K? (b) -196.°C? (c) 100.°C?
Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10-19 C, me1 = 9.11 × 10-31 kg)
A. 1.3 × 1018 m/s2 B. 3.0 × 1018 m/s2 C. 1.3 × 10-18 m/s2 D. 3.0 × 10-18 m/s2 E. 0 m/s2
Based on current estimates of the value of Hubble's constant, approximately how old is the universe?
A) 10 billion years old B) 12 billion years old C) 14 billion years old D) 18 billion years old E) 20 billion years old