A ______________ is always shorter than a ______________
a. solar day; sidereal day
b. solar day; mean solar day
c. sidereal day; solar day
d. mean solar day; solar day
a
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Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more
A) mass. B) electric charge. C) nucleons. D) all of the above E) none of the above
A spaceship leaves Earth and maintains a constant force by means of a nuclear engine. As the speed of the spaceship increases, an observer on Earth finds that relative to her the magnitude of the spaceship's acceleration is
a. 0. b. decreasing. c. constant. d. increasing. e. proportional to the kinetic energy of the spaceship.
An underwater scuba diver sees the Sun at an apparent angle of 39.6° from the vertical. How far is the Sun above the horizon? (nwater = 1.333)
a. 58.2° b. 61.4° c. 31.8° d. 28.6° e. 39.6°
In 1972, a utility owned a nuclear plant that was online 70% of the year, the oil burning plant was only out for unscheduled maintenance 10% of the time, and the gas-fired turbines were online 15% of the time
The nuclear plant is rated at 1000 MW, the oil plant at 940 MW, and the turbine at 200 MW. a. What is the total cost of running these three plants for the utility? b. How much would the utility have to charge per kWh to make a profit?