From a stationary position, I observe a moving boxcar, which has a mirror along the front wall, but it is open at the back of the boxcar. I send a flash of light from my flashlight and time the flash of light as it goes to the front of the boxcar and returns to the back of the boxcar. A passenger in the boxcar also times the round trip of the flash of light. Compare the times recorded on our
watches.
a. The time recorded on the two watches is the same.
b. The time recorded on his watch is shorter.
c. The time recorded on his watch is longer.
d. The answer depends on the reference system you are in.
B
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Due to the unusual thermal expansion properties of water, when a lake freezes during the winter, the water at the bottom of the lake is at ________ temperature than the water above it
A) the same B) a higher C) a lower
How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/(kg K) and the latent heat of fusion of water is 33.5 × 104 J/kg
A) 105 kJ B) 153 kJ C) 57.3 kJ D) 47.7 kJ E) 210 kJ
The Doppler radial velocity technique works best for
A) planets whose orbits are along are line of sight. B) planets whose orbits are perpendicular to our line of sight. C) planets whose orbits are nearly circular. D) planets whose orbits are very eccentric.
Shapley found the globular clusters were strongly concentrated toward Sagittarius
Indicate whether the statement is true or false