A piston in an internal combustion engine applies torque during 
of each full rotation of the crankshaft to which it is connected. Suppose an 8-cylinder engine (8 such pistons) is running with its crankshaft turning at 2500rpm and produces 410J of work each second. What is the torque applied to the crank shaft by one of the engine’s eight pistons?
A. 3.8 Nm
B. 1.6 Nm
C. 0.47Nm
D. 0.20 Nm
C. 0.47Nm
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________ are hot compact stars whose mass is comparable to the Sun's and size to Earth's.
A. Neutron stars B. Pulsars C. White dwarfs D. Black holes
The distance to a star with a parallax angle of 0.2 arc seconds is
A) 0.2 parsec. B) 2 parsecs. C) 5 parsecs. D) 12 parsecs. E) 20 parsecs.
If you wish to send a beam of laser light from Earth to a space station above the atmosphere near the horizon, aim your laser
A) above your line of sight. B) below your line of sight. C) along your line of sight.
What do astronomer's mean when they say that Earth is not in a special spot?
A. All space is expanding so Hubble's law would apply around all galaxies. B. The Big Bang explosion sent all material blasting away from the Earth. C. Hubble measured the expansion law from the Moon, not from the Earth. D. Hubble's law applies to some galaxies but not to others, so many planets besides Earth have their own Hubble's law. E. The Sun is at the center of the universe, but the Earth is not.