1.0 kg of steam at 100°C condenses to water at 100°C. What is the change in entropy in the process?
A)
zero
B)
6.1 × 103 J/K
C)
3.0 × 103 J/K
D)
-6.1 × 103 J/K
E)
none of the above
D
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Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10,000 m2 and the solar intensity is 1350 W/m2.
A. 0.72 N B. 0.09 N C. 9 N D. 45 N E. 0.18 N
When the Moon is directly opposite the Sun in the sky, its phase is
A) first or third quarter. B) waxing or waning gibbous. C) new. D) full. E) waxing or waning crescent.
Larry and Harry are twins. Larry takes off for a twenty year trip in a rocket ship that accelerates to a speed of 0.7c. When Larry returns to earth,
A. Larry is older than Harry. B. Larry and Harry are the same age. C. Harry is older than Larry. D. Larry is younger than when he left.
In buying a product, a shopper has a choice of the following amounts, all at the same price. Which is the best buy?
a. 432 cc b. 1 pint c. 1 half-liter d. 450 mL