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The mechanical effficiency of the system is 80%. What is the average power input in Watts necessary to accomplish this? Assume constant velocity.
An ideal carnot heat engine has an efficiency of 40%. If the high temperature is raised 15% what is the new efficiency keeping the same low temperature?
Determine the fraction of the prototype speed in air at which the model test should be made in water to ensure dynamically similar conditions.
Find i) The maximum pressure shown by a gauge on the cooker ii) The quantity of heat transferred to the water when it just starts to boil (ignore heat capacity of cooker).
Determine the shortest time possible for the rear wheel drive, 2 Mg truck to achieve a speed of 16 m/s with a constant acceleration starting from rest.
What is the Biot number of this cooling situation? Would lumped capacitance provide an accurate method for analyzing the cooling?
The sphere is cooled by 20oC air with a convection heat transfer coefficient of 100W/m^2*K?. What is the sphere's surface temperature?
At what true event rate will dead time losses (not to be confused with dead time) in counter B be twice as great as those for counter A?
Steam at 95 bar and 400 C is supplied in turbine. The condenser pressure is 0.035 bar. If the plant operates as a Rankine cycle, calculate: Heat transferred to the condenser cooling water.
Estimate the convective heat-transfer coefficient for natural convection from a horizontal steam pipe. The outside surface temperature of the insulated pipe is 80°C.
Water is the working fluid in an ideal Rankine cylce. Determine, the rate of heat transfer to the steam passing through the boiler, in kW
What exposure time is necessary for the concentration of CO2 at the center of a spherical tomato of 8 cm diameter to change to 15% by volume of air inside the tomato?
If, at this instant, the center of the wheel (C) has a velocity of 1.2 m/s to the right, and an acceleration of 2 m/s2, and the angle q = 30o, find The angular velocity and angular acceleration of r
Determine (a) the enthalpy of R-134a at the exit; (b) the temperature at exit; (c) the entropy of R-134a at the exit; and (d) the entropy generation.
Determine the air velocity at the exit when the inlet velocity is very low (can be neglected) and the nozzle isentropic efficiency is 90%.
Water Steam at 3MPa and 400oC is expanded to 100kPa in an adiabatic turbine with an isentropic efficiency of 92%. Determine the power produced by this turbine in kW when the mass flow rate is 2kg/s
The temperature of argon at the outlet is 20oC. Determine the outlet pressure of air and the specific work produced by this turbine
Consider X = Norm(5,7), Y = Norm(5,7) and Z = Norm(1,9) and assume X,Y and Z are independent. Find and sketch the probability density function of the random variable T = X-Y+Z.
If the maximum torsional shear stress is limited to 10KSI, determine the minimum outer radius to the nearest 1/8 in. Show all steps and calculations.
As the load on the motor is increased, the developed torque increases to 50 Ib-ft. Find the armature current required to produce the increased torque.
A 180-lb man and a 120-lb woman stand side by side at the same end of a 300-lb boat, ready to dive, each with a 16-ft/s velocity relative to the boat.
How larger surface edge crack can the advanced ceramics tolerate than the conventional ceramics for the same applies load?
In a spring mass system a 1kg block is dropped from a height of 1 meter on top of a spring with a spring constant (k) vlaue of 100N/m.
One structure is made from a Si3N4 plate which has a plane strain fracture toughness of 3.6 and is alternatively loaded with a tension stress of 300 MPa and a compression stress of 60 Mpa.
Calculate the required heat transfer to or from the reactor (state which it is) in kJ. Calculate the heat of this reaction at 400 degrees C and 1 atm.