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If the desired output of the engine is 15 kW determine the heat transfer from the high temperature reservoir and the heat transfer to the low-temperature reservoir.
Consider a cylinder containing air at 1200 kPa and 350 C and then, the air is expanded to 140 kPa with a reversible adiabatic process. Calculate the specific work (kJ/Kg) done by the gas. Assume ca
A 5-kg collar A is at rest on top of, but not attached to, a spring with stiffness K1= 400 n/m when a constant 150-N force is applied to the cable.
if the ambient temp is 25C and the ambient pressure is 1 bar, what is the maximum possible work that could be obtained per kilogram of steam in any continuos process?
If A has a constant angular acceleration of 30 rad/s^2, determine the tangential and normal components of acceleration of a point located at the rim of B when t = 3s, starting from rest.
A motor gives gear A an angular acceleration of 4(t^3) rad/s^2, where t is in seconds. If gear A is initially turning at 20 rad/s, determine the angular velocity of gear B when t = 2s.
Determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 20 psia.
For simplicity, you can assume the rope and pulley are ideal (no mass, no friction, etc.). Call your mass plus the mass of the seat M. How hard do you have to pull on the rope so that you accelerate
Knowing that Uk=.6 between the block and the horizantal surface and e=.7 between the block and the sphere, determine after impact; (a) the maximum height h reached by the sphere, (b) the distance x
Saturated liquid refrigerant R-134a at 40 deg.C is throttled into an evaporator coil where the temperature is -30 deg.C. What is the quality of the refrigerant after the expansion?
Rrefrigeration system removes 100 kJ/min from a cooling station held at a temperature of -5 C and rejects 125 kJ/min into the surroundings at 30 C. (a) Calculate the coefficient of performance of t
Consider a panel of aluminum alloy (KIC = 44 MPa m ) that contains internal micro-cracks and surface cracks as long as 0.1 mm in length. What is the tolerable tensile load, in N, to avoid catastroph
A flywheel has its angular speed increased uniformly from 20 to 70 in 76 . If the diameter of the wheel is 2, determine the magnitude of the normal component of acceleration of a point on the rim o
One of the policy suggestions for encouraging the use of one energy source over another is a carbon tax. How should such a tax be implemented and how can we evaluate the risks from using carbon to
The heat losses through the walls, windows, and the roof are estimated to be 120,000 Btu/h. Determine if the theater needs to be heated or cooled
Calculate the: a. Quality of the steam at the turbine exit b. Isentropic turbine work. 8 Btu/lbm c. Actual turbine work (Btu/lbm) d. Isentropic efficiency of the turbine.
Heating ceases when all the water remaining in the tank is saturated vapor at 20 bar. For the water, evaluate the heat transfer, in kJ, for each stage of heating.
What is the maximum thermal efficiency of this plant? What is the minimum rate of heat release from the reactor core? What is the minimum rate at which this plant rejects heat to the air?
Determine the (a) net work input, per unit mass of air flow, in kJ/kg. (b) refrigeration capacity, per unit mass of air flow, in kJ/kg. (c) coefficient of performance.
A long trough is supported by a continuous hing along its lover edge and by a series of horizontal cables attached to its upper edge.
Determine (a) the reaction at each of the front wheels, (b) the force between the boulder and the pallet. Center of grav of truck, G, is 1 m off ground Front wheels to G is 1.4 m.
How much of the water is in a liquid state when the piston moves (give me a mass in kg)? What is the boundary work accomplished in kilojoules to three significant digits.
For (a) Refrigerant 134a, (b) propane, (c) water, (d) refrigerant 22 and (e) ammonia as the working fluid, determine the operating pressures in the condenser and evaporator, in lbf/in², and the
What combination of resistors (series or parallel) would provide the smaller estimated uncertainty in an equivalent 1000 Ohms resistance?