A 100 gram glass container contains 200 grams of water at 
A 200 gram piece of lead at 150
is added to the water in the container. What is the final temperature of the system? (specific heat of water 
specific heat of glass 837.2 J/km 
specific heat of lead = 127.7 J/km
A. 12
B. 14
C. 23
D. 31
E. 37
B. 14
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Approximately how long does it take light to reach the Earth from the Sun?
a. 1 min b. 8 min c. 1 ly d. 8 ly e. 1 AU
Why is Supernova 1987A particularly important to astronomers?
A) It is the nearest supernova to have occurred at a time when we were capable of studying it carefully with telescopes. B) It was the first supernova detected in nearly 400 years. C) It provided the first evidence that supernovae really occur. D) It occurred only a few light-years from Earth.
A "double satellite" is launched into space. It consists of a satellite of mass m and another satellite of mass 5m. The connecting mechanism of these satellites is an explosive bolt and a compressed spring, both of negligible mass. The bolt is exploded and the satellites drift apart having been pushed by the spring. When the less massive satellite has moved a distance of 2.5 m from the center of
mass of the double satellite, how far away from it is the satellite of greater mass? a. 3.0 m b. 2.0 m c. 0.50 m d. 4.5 m
What would be the de Broglie wavelength for 1-g object moving at the earth's escape speed 25,000 mph (about 11 km/s)? (h = 6.626 × 10-34 J ? s)
What will be an ideal response?