Ball is thrown horizontally from the top of a building
A ball is thrown horizontally from the top of a building that is 15.67 m high with a speed of 23.47 m/s. Neglecting air resistance, at what angle with respect to the horizontal will the ball strike the ground?
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An air-standard Otto cycle has a compression ratio of 8 and the temperature and pressure at the beginning of the compression process are 5208R and 14.2 lbf/in.2, respectively. Determine the maximum pressure, in lbf/in.2.
The Stanford Linear Accelerator accelerated a beam consisting of 1.2 1014 electrons per second through a potential difference of 4.0 1010 V. (When entering units, use ohm for ?) (a) Calculate the current in the beam.
The Department of Energy projects that between the years 1995 and 2010, the United States will need to build new power plants to generate an additional 150,000 MW of electricity to meet the increasing demand for electric power.
An inventor claims to have developed a device that takes an air stream at 20°C, 274 kPa, and produces two separate streams, one at 60°C, 270 kPa.
The lowest temperature that has been achieved is about 1 × 10-6 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem, namely nuclear cooling.
The loading on the piston is such that the PV product is a constant. Assuming the room temperature is 20°C, show that this process does not violate the second law.
A food department is kept at -15 degrees Celsius by a refrigerator in an environment at 25 degrees Celsius. The total heat gain to the food department is estimated to be 3500 kJ/h and the heat rejection in the condenser is 4500 kJ/h.
The 20°C surroundings experience an entropy increase of 0.008 kW/K. Determine (a) the rate of heat loss from the compressor, (b) the exit temperature of the refrigerant, and (c) the rate of entropy generation.
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