Chapter 8, Problem 8.3P

give a specific example of a process that has the energy changes and transfers described. (For example, if the question states “ΔEth > 0, W = 0,” you are to describe a process that has an increase in thermal energy and no transfer of energy by work. You could write “Heating a pan of water on the stove.”)                           ΔEth < 0, W ≠ 0, Q ≠ 0

How does a pumped hydro system cover the gasps in energy provided by wind or solar power ?

2) The energy consumed by a shower for 30 days is 22kwh. It is known that the resistance of the showerhead is 20 ohms and that its nominal current is 15A. So, what is the time in minutes that the shower was turned on during this period?

Need a cancellation method. Thermodynamics

A container maintains a constant pressure of 40800 Pa while changing to a volume of 791 liters. If 31080 J of work was done by the gas, what was the starting volume? *

What are the two forms of energy interactions associated with a closed system, explain it?

3. The pump of a water distribution system is powered by a 15 kW electric motor whose efficiency is 90%. The water flow rate through the pump is 50 L/s. The diameters of the inlet and outlet pipes are the same and the elevation difference across the pump is negligible. If the pressures at the inlet and outlet of the pump are measured to be 100 kPa and 300 kPa respectively. Determine the following: a.) efficiency of the pump b.) determine the temperature rise of water as it flows through the pump due to the mechanical inefficiency.

In a news article, it is stated that a recently developed geared turbofan engine produces 15,000 pounds of thrust to propel the aircraft forward. Is “pound” mentioned here lbm or lbf? Explain.

Sometimes in listening to the sound of a twin propeller engine airplane, the hum of the engines is not steady, but is varying in intensity between loud and softer. How can this be?