______ is a website that provides a platform for posting user-created animated GIFs.
A. YouTube
B. Tumblr
C. Flash
D. Pinterest
Answer: B
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Venus's atmosphere lacks water because the Sun's ultraviolet rays tend to break up any water molecules at the top of the atmosphere.
Answer the following statement true (T) or false (F)
The charge of an electron is
a. positive b. negative c. electrons have no charge
The Kuiper Belt is located beyond the orbit of ________
Fill in the blank(s) with correct word
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat produced by the combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the maximum efficiency that this plant could possibly have using the same temperature extremes that it presently uses? (c) How much thermal energy is exhausted each day by this plant?