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A man climbing a staircase of height 10m carries a brief case weighing 100N. Find the total work done and also form a problem statement?
For the same surfaces temperatures and dimensions as in part (a), show how the midpoint temperature would change if the shell material were aluminum.
Heat transfer from the compressor to its surroundings occurs at a rate is 20.5 Btu/lb of air flowing. Determine the compressor power, in Horsepower, for steady-state operation.
Find the maximum value of the principal stress and find the principal stresses and maximum shear stress 0.000385 m below the surface in the steel ball.
Determine (a) the initial acceleration of the projectile, (b) the time required for the projectile to penetrate 3.9 in. in the resisting medium.
This pinion runs at a speed of 1200 rev/min and transmits 15 hp to a 60-tooth gear. If the face width is 2 in, estimate the bending stress.
Using continuity, momentum, and energy equations along with perfect gas law, Show how the flow at station 2 may be determined from conditions at station 1.
A steam power plant is proposed to operate between a pressure of 10 kPa and 2 MPa with a maximum temperature of 400 oC.
If the compression ratio is 10 while operating with a low temperature of 200oC and a low pressure of 200 kPa. Determine the maximum thermal efficiency. What will be the Carnot cycle efficiency?
A system executes a power cycle while receiving 1000 kJ by heat transfer at a temperature of 500 K ad discharging energy by heat transfer at a temperature of 300 K.
Suppose we want to cool a sample of N2 gas at room temperature and pressure (25C and 101 kPa) to 100 K using a reversible adiabatic expansion. What should the final pressure be?
How much power will the cycle produce when it is executed 4000 times per minute? Use constant specific heats at room temperature.
Accounting for the variation of specific heats with temperature. Determine: The cutoff ratio The heat rejection per unit mass The thermal efficiency.
A hollow steel shaft (G = 77.2 GPa, allowable stress = 50 MPa, outer diameter = 60 mm. Determine (a) the maximum power that can be transmitted, and (b) the corresponding angle of twist of the shaft.
Design a chain drive for this uniformly loaded system driven by a gasoline engine via a mechanical drive (Service factor is 1.4). Assume that the larger sprocket is to have 80 teeth.
What is the minimum value of the coefficient of static friction µs that will ensure that the block does not slip with respect to the trailer bed?
Determine the fraction of the heat transfer QH discharged at TH provided by (a) the net work input, (b) the heat transfer QC from the cold reservoir TC.
Determine the velocity (m/s) and mass flow rate (kg/s) of the ammonia saturated vapor stream leaving the control volume.
Plot the cost versus r for 2 ≤ r ≤ 10 m, and determine the radius that results in the least cost. Compute the corresponding height h.
Estimate the steady-state heat loss from the pipe (in W/m) when the oil is at 90 degrees Celcius. Ignore the inside thermal resistance.
The convection coefficient is h = 10 W/m2K. Determine the centerline temperature of the beam after an exposure time of t = 6 hours.
The pressure inside the cylinder is held constant at 300 kPa during the process, and a heat loss of 60Kj occurs. Determine the electric energy supplied, in kWh.
The steam is further heated to 400 degrees C. Assume that all the processes are isobaric. Calculate the change in enthalpy in kilocalories and in joules.
The systolic and diastolic pressures of a healthy person are about 120 mm and 80 mm of mercury respectively. Express this pressure in kPa and in meters of water.
Calculate the heat loss rate per meter length of the pipe for insulation thickness values of 0, 0.5, 1, 2, 3, 4, 5 and 6 cm. Plot the results and discuss the variation obtained.