How does the author describe the meteor strike at Chelyabinsk? A, It was the most destructive meteor strike in documented history. B. The meteor strike had very few witnesses and was not well documented. TC. he meteor strike was in a thinly populated area and did not hurt anyone The meteor strike created a bright flash of light, a heat wave, and a shock wave.

Rubber on floor tile has a coefficient of kinetic friction of 1.0 and a coefficient of static friction of 2.0. how much force would a 3.5 lb. robot need to produce in order to start moving?

Why do electron microscopes have higher resolving power than light microscopes?

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 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) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?