If you toss a coin straight upward while in a train moving at constant velocity, the coin will land
A) as if you were at rest.
B) in front of you.
C) in back of you.
Answer: A
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Radio telescopes are generally ________ than visible-light telescopes.
A) much larger B) much smaller C) much more expensive D) located at much higher altitudes
All specimens of a pure ______________ have identical properties and composition
Fill in the blank(s) with correct word
A heat exchanger is to be designed to heat a flow of molten bismuth from 377°C to 477°C. The heat exchanger consists of a 50-mm-ID tube with surface temperature maintained uniformly at 500°C by an electrical heater. Find the length of the tube and the power required to heat 4 kg/s and 8 kg/s of bismuth.
GIVENS
FIND
The length (L) tube and power required (q) to heat 4 kg/s and 8 kg/s of bismuth
ASSUMPTIONS
Steady state
Uniform and constant surface temperature
Losses from the heater are negligible
SKETCH
PROPERTIES AND CONSTANTS
for Bismuth at the average bulk temperature of 427°C
The radius of the Earth is 6,380,000 m at the equator. Give the radius of the earth in scientific notation.
A. 638 × 104 m B. 6380 × 103 m C. 6.38 × 106 m D. 0.638 × 107 m