The biggest drawback to extensive use of photovoltaic cells is

9. Is the entropy of a bag of popcorn greater than, less than, or equal to the entropy of the kernels of corn before popping? Explain.

In an isolated system far from thermal equilibrium, as time passes,A. The total energy stays the same; the total entropy stays the same.B. The total energy decreases; the total entropy increases.C. The total energy stays the same; the total entropy increases.D. The total energy decreases; the total entropy stays the same.

4) Physical systems work in a “one-way street” – the amount of information we have about the state (energy state, position, velocity, etc.) of the molecules, atoms, and particles involved in general, decreases over time. A measure of the decrease of this type of information over time, or the increase in disorder,  is called:    energy    force    the adiabatic constant   entropy    work

3. How long must a 400 W electrical engine work in order to produce 300 kJ of work?

The number of cycles generated per second by a source is called the frequency of the source, true or false?

Study Guide Mix n Match:       Heat is Energy moving from low temperature to high temperature. Energy moving from high temperature to low temperature. The same as temperature.       The First Law of Thermodynamics defines The principle of entropy. The Law of heat addition. The conservation of heat.         The greater the difference in temperature between the input                         reservoir and the output reservoir of a heat engine, the Greater the efficiency. Less the efficiency. Efficiency is not affected by temperature.           A Carnot engine Can never be 100% efficient. Can sometimes be 100% efficient. Is always 100% efficient.         When a water is going through a phase change from liquid to gas It gives up 540 cal/g of heat. It absorbs 540 cal/g of heat. It makes a 100oC temperature change.          Displacement is a Scalar Quantity Vector Quantity MKS Quantity        The acceleration at the peak of the rise of a projectile is Equal…

3) Consider a system consisting of one particle with two states, one of energy 0 and one of energy +ɛ. a) Write down the partition function Z for this system. b) Show that the average energy for this system can be written as

3. How long could a 2000 Hp motor be operated on the heat energy liberated by 1 mi. of ocean water when the temperature of the water is lowered by 1 degree Celcius and if all these heat were converted to mechanical energy?

Electric vehicles increase speed by using an electric motor that draws energy from a battery. When the vehicle slows, the motor runs as a generator, recharging the battery. Explain why this means that an electric vehicle can be more efficient than a gasoline-fueled vehicle.