Mechanical Engineering Answers

A 30 cm diameter pipe carries water under a head of 20 meters with a velocity of 3.5
m/s. If the axis of the pipe turns through 450
, find the magnitude and direction force
on the bend.

A rigid vessel contains water at 400 °F. Heat is to be added so that the water passes through the critical point. What should the quality be at the temperature of 400° F.

In a process with a regulated mass system, there is a heat loss (heat exiting the system) of 1055 J with the energy in the system of 210 kJ. Define the work being done and include compression or expansion?

The water vapor is pressurized at first 140 kPa and its volume is 150 liters, then compressed so that the volume becomes 30 liters following the law pV1,2 = C. determine the work and final pressure

A reciprocating compressor draws in 500 ft3/min of air whose density is 0.079 lb/ft3 and discharges it with a density of 0.304 lb/ft3. At the suction, p1 = 15 psia; at discharge, p2 = 80 psia. The increase in the specific internal energy is 33.8 Btu/lb and the heat transferred from the air by cooling is 13 Btu/lb. Determine the work on the air in Btu/min and in hp. Neglect change in kinetic energy5 m/s2.

Assuming that there are no heat effects and no frictional effects, find the kinetic energy (in Btu) and speed (in fps) of a 3,330-lb body after it falls 877 ft from the rest. Start with the steady flow equation, deleting energy terms which are irrelevant.

There are 400 kg/min of water being handled by a pump. The lift is from a 20-m deep well and the delivery velocity is 15 m/s. Find (a) the change of potential energy in kJ/kg, (b) the kinetic energy in kJ/kg, and (c) the required power of the pumping unit in kW. Assume g = 9.75 m/s2.

A piston cylinder contains gas initially at 3500 kPa with a volume of 0.03 cubic meter. The gas
is compressed during a process where pV raise to 1.25 = C to a pressure of 8500 kPa. The heat
transfer from the gas is 2.5 kJ. neglecting changes in kinetic and potential energies determine the nonflow work in kJ.

A piston cylinder contains gas initially at 3500 kPa with a volume of 0.03 cubic meter. The gas is compressed during a process where pV raise to 1.25 = C to a pressure of 8500 kPa. The heat transfer from the gas is 2.5 kJ. Determine the nonflow work in kj, neglecting changes in kinetic and potential energies.

. A 200 × 150 × 10 angle is to be welded to a steel plate by fillet welds as shown in Figure. If
the angle is subjected to a static load of 300kN, find the length of weld at the top & bottom.
The allowable shear stress may be taken as 75 N/mm2
.