Carolyn R

Water flows steadily from an open tank. The elevation of point 1 is 10.0 m, and the elevation of points 2 and 3 is 2.00 m. The cross-sectional area at point 2 is 4.80×10−2 m^2; at point 3, where the water is discharged, it is 1.60×10−2 m^2. The cross-sectional area of the tank is very large compared with the cross-sectional area of the pipe. Assuming that Bernoulli's equation applies, compute the volume of water DeltaV that flows across the exit of the pipe in 1.00 s. In other words, find the discharge rate \Delta V/\Delta t in m^3/s.

A cargo barge is loaded in a saltwater harbor for a trip up a freshwater river.

If the rectangular barge is 2.50 m by 24.0 m and sits 0.700 m deep in the harbor, how deep will it sit in the river?

it's not .021 m

A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm^3 of air at atmospheric pressure (1.01x 10^5 Pa) and a temperature of 27.0degrees C. At the end of the stroke, the air has been compressed to a volume of 46.2 cm^3 and the gauge pressure has increased to 2.72x10^6 Pa. Compute the final temperature T in degrees C.

The answer isn't 474

A typical coal-fired power plant burns 310 metric tons of coal every hour to generate 780 MW of electricity. 1 metric ton= 1000 kg. The density of coal is 1500 kg/ m^3 and its heat of combustion is 28 MJ/kg. Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electrical energy.

What is the power plant's thermal efficiency?

A heat engine operating between energy reservoirs at 20 degrees C and 600 degrees C has 30% of the maximum possible efficiency.

How much energy must this engine extract from the hot reservoir to do 1000 J of work?

A 710 kg car drives at a constant speed of 23 m/s. It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car up a hill with a slope of 2.0 degrees (in watts)?