Agallon of gasoline contains chemical energy. if you pour a gallon of gasoline into your car, you could drive for about 20 miles on the highway (about 20 minutes). you could choose instead to run a lawn mower for an hour with one gallon of gasoline. if the gasoline were to come in contact with a fire, the entire gallon would burn in less than a minute. which reaction has the most power?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.

While preforming an experiment involving a reaction between two chemicals the scientist observes that the reaction container has become warm the observation is an example of