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Find the design factor for high-cycle fatigue life of a 100,000 load cycles using (a) Modified Goodman, (b) Soderberg criteria, (c) Gerber criteria and (d) the ASME-Elliptic criteria.
A boat of length 50 m is designed to cruise at 30 mph and is to be tested in a tow tank with a model of length 0.5 m. If the model wave drag is 1.2 N, what is the estimated full-size boat wave drag
A hail storm caused nearly golf-ball sized hail to fall on a house. Draw a free body diagram of the hailstone falling through quiescent air.
Bob is asked to design a system for heating process water in a chemical plant. What capacity of natural gas burners must Bob provide, measured in BTU/H?
Determine the average force exerted by the bat on the ball? Determine how much the angle would change ( with respect to 31 degrees) if we were to neglect the effects of the force of gravity on the b
Determine the magnitude of the average force that needs to be applied to the car for such an acceleration to occur. FBD?
If the largest internal crack in a polycarbonate sheet is 0.100mm long and there are no surface cracks, what is the failure stress? Take Y = 1.30. Polycarbonate has a fracture toughness of2.20 MPa*
Air at 1 atm , and 35C flow across a 5 cm diameter cylinder at velocity 50 m/s . The cylinder surface is maintained at 150C , Calculate heat loss per unit length of the Cylinder.
Determine the specific enthalpy of R-134a at the exit; the temperature at exit; the specific entropy of R-134a at the exit; and the specific entropy generation.
What should be the testing speed for the model in the wind tunnel to scheive similarity? Consider Reynolds number is the only relevant independent dimensionless parameter for the problem.
A 7-m- diameter spherical hot air ballon is neither rising nor falling at some height. The density of atmoshpheric air is 1.3 kg/ m^3 there.
The moist air is then passes through the heating unit. In the heating unit the moist air is heated to 24 oC without adding any moisture. Calculate the rate at whic
The viscosity of the water is 1.12x10^-3 Pa s. Determine the power (in horse power) that must be supplied to the converter belt.
The shaft supports a single concentrated mass at its center. The weight of the concentrated mass is 0.6 kip. Estimate the critical speed of the shaft, expressed in rpm.
The steam leaves the turbine at 100 mm Hg absolute pressure. the turbine isentropic efficiency is 0.75. calculate the efficiency of the plant. if the unit produces 12.5 MW, what is the steam flow ra
Calculate the effectiveness of the heat exchanger if the direction of flow of one of the fluids is reversed with the same mass flow rates as before?
The temperature in a vessel is 36 degree C and the proportion by mass of air to dry saturated steam is 0.1. what is the pressure in the vessel in bar and in mm of mercury vacuum?
The volume at the beginning of compression is three times that at the end of compression. calculate the temperature of the air at outlet and the increase of internal energy per kg of air?
Determine (a) the minimum temperature of the cycle, (b) mass flow rate (m) for a refrigeration rate of 1 ton and (c) the COP. (d) What would the COP be if the adiabatic efficiency increased to 85%?
An insulated piston-cylinder device initially contains 9.647 lb of air at 20 psia and 60ºF. Determine the change in entropy of the air using a variable heat capacity in units of Btu/R. Please sho
How many horsepower does the crane motor exert during the lift? If the crane engine is running at 2000 rpm, how much torque is the motor exerting?
A truck engine delivers 50hp(total) to the truck's (two) rear axles. The truck has 36'' tires and is travelling at 60 mph. What is the torque exerted on each axle?
Draw the temperature dependence (line) of the vacancy concentration on a plot, making sure to label the axes.
A material that you are working with has a band gap of 4 eV but it is opaque (doesn'ttransmit light) because it contains many pores. Why do materials tend to expand with temperature?
Determine: (a)the force sustained by the matrix phase, (b)the modulus of elasticity of the compos- ite material in the longitudinal direction, and (c) the moduli of elasticity for fiber and matrix