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Estimate the length of time that the U.S. coal reserves of 2.5 × 1015 kg will last if they are used exclusively to provide 100 percent of the U.S. energy demand at a thermal efficiency of 35 p
Why is the world record greater than the apparent ability of the pole-vaulter on the basis of a simplified conservation-of-energy analysis?
Show that heat transfer during a process in which there is no work done by or on a system is independent of path.
7 g helium at 50 kPa and 200 K (ideal gas, M = 4, k = 5/3) are compressed polytropically in a quasistatic process with pv1.8 to 600 kPa. Find the final temperature of helium. find the work and heat
A fin array is 5cm tall, spaced 5mm apart from each other, 2mm thick, and 12mm deep. The base of the array is 40C, how much heat does this array dissipate?
A plain carbon steel fin is 3cm long, 5mm thick, and 5cm deep. How much heat does the fin transfer, and what is the fin effectiveness and fin efficiency?
Calculate the water temperature (K) at the exit, (a) if there is no heat loss from the heat exchanger to the surroundings, and (b) if heat is lost to the surroundings at a rate of 6 kW.
The rate of heat loss from the turbine casing to the surroundings is 8.5 kW. Calculate (a) the mass flow rate (kg/s) of the steam, and (b) the power output (MW) of the turbine.
Find the inlet area (m2), (b) Find the velocity (m/s) and area (m^2) at a point where p2 = 20 bar, T2 = 180oC, and (c) Find the velocity (m/s) and area (m^2) at a point where p3 = 5 bar, T3 = 50oC.
He jumps so that when he lands on the sidewalk he is moving at 1.3 m/s (relative to the sidewalk). If his mass is 75 kg and the skateboard's mass is 5.0 kg, what is the final velocity of the skatebo
The truck's initial speed is about 29 m/s. If the mass of your car is 750 kg and the mass of the truck is 1250 kg, what was the speed of the truck after you hit it?
From there, it is isochorically brought to a final pressure and temperature of 10 bar and 200°C. Show the process on a P-v diagram and determine the work transfer for each process (W12 and W23).
Knowing that P must have a 750-N Component Perpendicular to member ABC, determine (a) the magnitude of the force P, (b) its component parallel to ABC.
If the mass of the cart is 100 Kg and the jet of water leaves the nozzle (of area 0.001 m2 with a speed of 35 m/s, determine the speed of the cart after the jet is directed against the cart.
A 6.0 kg ball traveling 13 m/s collides head-on with a 3.0 kg hunk of putty initially at rest. Assuming a completely inelastic collision, what is the speed of the ball just after the collision?
The power supplied to the refrigerant during compression process is 2.35 kW. What is the temperature of R-134a at the exit of the compressor?
Determine the difference in pressure just under the vessel's cover between a point on the circumference and a point on the axis.
Calculate the diffusion coefficient if the diffusion flux is 1.9 × 10-8 kg/m2·s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm3, respectively.
Find the diameter of the smallest shaft that can be used, what is the maximum shear stress in the shaft of this diameter? Use G = 83 GPa for steel.
If the ultimate tensile stress of the material used is 600 MN/m2, and the efficiency of the longitudinal joint is 70 per cent, determine the factor of safety?
As the refrigerant passes through the compressor, heat transfer to the surroundings occur at a rate of 0.32 kJ/s. Determine the power input to the compressor in kW.
As it operates, the machine produces a harmonic force of magnitude 125 N. Determine the operating speeds of the machine at which the machine's steady-state amplitude is less than 0.2 mm.
If after 49.5 h the concentration of carbon s .35wt% at a position 4.0mm below the surface, determine the temperature at which the treatment was carried out.
The gas is allowed to expand until the pressure is 1 bar and the final volume is 0.02 m^3. Calculate (1) the molar mass of the gas and (2) the final temperature.
While the piston mass is 30 kg, its area is .003m^2, and the ambient pressure is 100 kPa. The pin is then removed and the H2O expands rapidly and adiabatically. What is the final state of the H2O?