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Determine the steady-state current in the circuit shown in Figure 7.31(a) when the applied voltage is of the form shown in Figure 7.31(b).
when the three blocks are released from rest they accelerate with a magnitude of 0.660 ms2. block 1 has mass m block 2
A heat pump with a coefficient of performance of 3.8 provides energy at an average rate of 75,000 kJ/h to maintain a building at 21oC on a day when the outside temperature is 0oC. If electricity costs 8 cents per kW. h. Determine the electric power r..
a hot dog can be considered to be a cylinder 12 cm long and 2 cm in diameter whose properties are rho 980 kgm3 cp 3.9
many modern houses use heat pumps for winter heating and then their owners reverse the cycle and enjoy summer cooling
a fuel oil is analyzed and found to contain 85.0 wt carbon 12.0 elemental hydrogen h 1.7 sulfur and the remainder
a portable heater is placed inside a laboratory chamber to maintain the inside air temperature of the chamber at
a piston-cylinder device containing air undergoes a polytropic compression process from 2 liters 300 kpa and 20 degc to
The system is at rest in the position shown, with the 12-lb collar A resting on the spring (k = 20 lb/ft), when a constant 30-lb force is applied to the cable. What is the velocity of the collar when it has risen 1 ft? The collar is attached to th..
Propose an interesting Heat-Transfer project that includes a numerical analysis to determine temperatures and heat rate or heat flux. Object, device or system description and sketch.
a particle moves along a circular path of radius 300 . if its angular velocity is 2t where is in seconds determine the
A piston-cylinder assembly contains air at 227C and 300 kPa. Heat is supplied from a reservoir at 900 K causing the air to expand the path Pv^1.2 constant until the pressure is 200 kPa. The surroundings are at 27C and 95 kPa. Determine the second law..
a certain object weighs 300 n at the earths surface. determine the mass of the object in kilograms and its weight in
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