If the energy conversion efficiencies in a 3 step process are 30% for the first step, 40% for the second, and 20% for the third, the overall efficiency (step one to end) is about:
a. 2% b. 10% c. 20% d. 50% e. 90%
a
Physics & Space Science
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A thermometer registers a change in temperature of 100°F. What change in temperature does this correspond to on the Kelvin Scale?
a. 453 b. 328 c. 180 d. 55.6 e. 24.5
Physics & Space Science
The energy usage in the United States in 2010 was about 100 × 10^18 J. This can be written as:
(A) 100 million GJ (B) 1000 million GJ (C) 100 billion MJ (D) 100 trillion MJ
Physics & Space Science
If an object's speed is constant, its velocity must also be constant
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Which of the following statements is true of stars?
A) They are highly unbalanced. B) They are held together by their own gravity. C) They do not have their own source of energy. D) They defy the law of conservation of mass.
Physics & Space Science