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A closed tank, V = 10 L, containing 5 kg of water initially at 25°C, is heated to 175°C by a heat pump that is receiving heat from the surroundings at 25°C. Assume that this process is
A piston cylinder has R-134a at -20oC, 100 kPa which is compressed to 500 kPa in a reversible adiabatic process. Find the final temperature and the specific work.
In a Rankine cycle with reheat, steam at 500C expands in a high pressure turbine until it reaches the saturated vapor state. Find a steam inlet pressure for the high pressure turbine.
A hot water stream at 80 C enters a mixing chamber with a mass flow rate of 0.5 kg/s where it is mixed with a stream of cold water at 20 C.
A cantilever beam has a z section of uniform thickness for which Iy = 2/3th^3, Iz = 8/3th^3, and Iyz = -th^3. Determine the maximum bending stress in the beam subjected to a load P at its free end.
A square threaded power screw has a lead angle (lambda) of 15o. What is the preferred method of joining composite materials - using adhesives or using screw fasteners? Why?
If this house were heated instead by a heat pump that has an average COP of 2.4, determine how much money the home owner would have saved that month. Assume a price of 8.5¢/kWh for electricity.
A relief valve is installed on the tank to keep the pressure constan during the process. Find the mass of steam that is bled from the tank, in kg? Find the amount of heat transferred in kJ?
Determine the maximum steady-state hay temperature for dry hay (q,dot = 1W/m^3), moist hay (q,dot= 10W/m^3), and wet hay (q,dot= 100W/m^3). Ambient conditions are T inf =0 C and h =
At t=0 bullet A is fired vertically with an initial velocity of 450 m/s. After 3 seconds, bullet B is fired upward with an initial velocity of 600 m/s. Determine the time t, after nA is fired, at wh
Assuming that flow is steady and incompressible obtain a) the y component of the velocity b) show that the acceletation at a point (2,1) is 20 i+ 26/3
In such an experiment for which steady state operation is maintaned over a 12 hour period, the input electrical energy is 125,000 J. Determine the fridges coefficient of performance COP.
An Industrial machine of mass 453.4kg is supported on springs with a static deflection of 0.508cm. If the machine has a rotating unbalanced 0.2303kg.m.
Calculate the mass flow rate of air and the required power input. Consider both constant specific heat and variable specific heat (since the temperature change is significant).
The plate is heated over its total length to a temperature of 55 °C. The fluid velocity is measured 30 cm from the edge of the plate and found to be 22.5 m/s. Is the flow laminar or turbulent? J
Two cylinders are filled with liquid water, ? = 1000 kg/m3, and connected by a line with a closed valve. A has 100 kg and B has 500 kg of water, their cross-sectional areas are AA = 0.1 m2 and AB =
When you move up from the surface of the earth the gravitation is reduced as g = 9.807 - 3.32 × 10-6 z, with z as the elevation in meters. How many percent is the weight of an airplane reduced
Helium at atmospheric pressure and 30 °C flows across a square plate at a free stream velocity of 15 m/s. Calculate the boundary layer thickness at a position where Re = 250,000.
Air at 1 atm and 30 °C flows over a 15 cm square plate at a velocity of 10 m/s. Calculate the maximum boundary layer thickness.
The air is now compressed to 0.1 m3in such a way that the temperature inside the cylinder remains constant. Determine the work done during this process.
A well-insulated rigid vessel contains 3kg of saturated liquid water at 40o C. The vessel also contains an electrical resistor that draws 10 amperes when 50 volts are applied. Determine the fin
First constant volume to 1000 K(state 2) then followed by a constant pressure process to 1500 K (state 3). Find the final volume and the work in the process.
he exit quality is 90% at 1 bar and average flow speed of 50 m/s, at a height of 50 cm above the datum. Determine the following:the change in potential energy per unit mass in kJ/kg
A piston, mp= 5 kg, is fitted in a cylinder, A = 15 cm2, that contains a gas. The setup is in a centrifuge that creates an acceleration of 25 m/s2 in the direction of piston motion towards the gas.