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Determine the operating angular speed of each dam's pump and the volume flow rate and lift required in the scale model.
Sketch the shear force and bending moment diagrams for the beam, and show that the maximum bending moment in the beam is 21.875 Nm.
The police starts accelerating from rest at 10 ft/sec^2 until her velocity is 85 mph. How long does it take her to overtake the speeding car if it neither speeds up or slows down?
The water now undergoes a process until its volume is one-half of the original volume. Calculate the final temperature and the specific enthalpy of the water.
Find the acceleration of P. Then, if a braking deceleration of 2ft/sec^2 is experienced beginning when P is at 120 ft, determine the time and distance required for stopping.
A piston has an area of 500 mm2. What mass must the piston has if it exerts a pressure of 50 kPa above atmospheric pressure on the gas enclosed in the cylinder?
Determine (a) the final pressure, (b) the change in volume of the cylinder, and (c) the change in the enthalpy of the refrigerant-134a.
If the local atmospheric pressure is 101 kPa, determine the temperature at which the water starts boiling when it is heated.
A 1.8-m3 rigid tank contains steam at 220°C. One third of the volume is in the liquid phase and the rest is in the vapor form.
Assume the temperature of the surroundings is 20°C, determine the work done and the net entropy change for the process.
Suppose that 1 kg of saturated water vapor at 100ºC is condensed to a saturated liquid at 100ºC in a constant-pressure process by heat transfer to the surrounding air, which is at 25º
At the entrance, the air has a velocity of 5 m/s and is at 350 kPa, 25°C. The air exits at 320 kPa, 90°C. Calculate the velocity at the exit.
The initial pressure is 2 bar and the initial volume is 4 m3. The heat transfer to the tank is 2000 kJ, and the final volume is 7 m3. Determine the change in internal energy.
A piston-cylinder device contains 0.1 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 800 kPa. What is the initial temperature of the water?
A mass of 1 kg of air contained in a cylinder at 1.5 MPa, 1000 K, expands in a reversible isothermal process to a volume 10 times larger.
Initially the cylinder contains 4 kg of saturated (two-phase) water at 35oC. The final pressure is 7 MPa. Determine the final state of the H2O and the work done during the process.
Heat is added from a 600°C source until the water is at 1MPa, 500°C. Find the heat transfer and the total change in entropy.
This system is now heated at constant pressure until the temperature of the system is 300oC. Calculate the work done by the steam during the process.
The initial pressure is 100 kPa, and the initial temperature is 20oC. The final volume is 81of the initial volume. Determine the work and the heat transfer.
Determine q and w for each individual process. Assume the specific heats are constant and P1=1 bar, T1=15oC and P2=6 bar.
How much does the internal energy of the air in the auditorium increases during the first 20 minutes after the ventilation system fails?
The condenser pressure is 10 kpa and both feedwater heaters are open heaters. Calculate the cycle thermanl efficiency and the net work per kg of steam?
A 32.2 lb object is dropped from a 100 feet building. Determine the velocity and the kinetic energy at the 50 feet level and at 35 feet above the ground.
A 4000 lb car traveling at 60 mph decelerates at a constant rate and comes up to a stop over a distance of 200 feet.