The overall efficiency of a power plant can be increased by "co-generation", that is, by ________
a. recycling the waste heat from a power plant back to the boiler
b. raising the temperature of the steam by the use of two boilers
c. combining two types of steam engines to generate electricity
d. generating electricity and using some of the waste heat to provide process steam
d
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When it is winter in the northern hemisphere, it is ____ in the southern hemisphere
a. winter b. summer c. spring d. fall
An open box-car has a mass of 30,000 kg and is moving on a level railroad track at 4.00 m/s. 1,000 kg of water falls straight down into the box-car. The velocity of the box-car after the water falls into the box- car is
A. 7.01 m/s. B. 6.55 m/s. C. 5.02 m/s. D. 3.87 m/s. E. 2.89 m/s.
A 905-g meteor impacts the earth at a speed of 1629 m/s. If all of its energy is entirely converted to heat in the meteor, what will be the resulting temperature rise of the meteor, assuming it does not melt? The specific heat for the meteor material
is 472 J/kg?K, which is about the same as that of iron. A) 2,540,000°C B) 11,700°C C) 2810°C D) 3.10°C
In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.4 × 1019 kg B) 4.8 × 1019 kg C) 1.2 × 1020 kg D) 2.4 × 1020 kg E) 4.8 × 1020 kg