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What is the minimum coefficient of friction necessary between the tires and the ramp surface so that the vehicle does not slide down the ramp?
A velocity profile for fully developed laminar flow in a circular tube as u=umax [1-(r/R)^2]. obtain an expression for shear force per unit volume in the x direction for this flow?
If the cable length is 149 feet and the buildings are separated by 100 feet, what is the load on the cable in pounds?
Consider a piston-cylinder assembly containing 0.14 kg of air initially at a pressure of 350 kPa. Sketch the process on a P-V diagram and calculate the amount of heat added during the process.
A vertical piston-cylinder device initially contains air at 150 kPa and 27 °C. Determine the total heat transferred to the airAssume the air is an ideal gas and: cv,air = 0.717 J/g.K, Mair = 28.97
Determine the final temperature of nitrogen. Assume nitrogen to be an ideal gas with M = 28 g/mol and cp=1.039 kJ/kg.K.
What is the minimum center-to-center spacing of the bolts that will allow them to be tightened with a standard 1/2-inch open-end wrench?
A 55 horsepower 1800 rpm electric motor is connected to a speed reducer with a ratio of 17:1. What is torque available at the output of the reducer for which the system must be designed?
How do the concepts of cracking pressure, pressure override and full-flow pressure relate to the operation of other control valves, such as sequence and counterbalance valves?
In addition to the analysis that you presented in (a), what features might you look for on the fracture surfaces to support your conclusion?
Write a program that accepts a numerical value x from 0 to 100 as input and cmputes and displays the corresponding letter grade. Use only elseif clauses in your program.
Assuming that the volume of the football does not change significantly during the cooling process, evaluate the following the mass of air inside the ball.
Assume the enthalpy of the inlet and exit air for each tank is constant at 300.19kJ/kg. One tank is ~198oK higher than the other after the valve shuts.
The volumetric flow rate at the exit for constant specific heat is 3.831 m^3/s. Calculate the volumetric flow rate at the exit for variable specific heat.
Find the enthalpy of steam at 0.4 Mpa and 0.7 dryness. Determine the amound of heat required to convert 4kg of water at t=38K into dry saturated steam at 1 MPa gauge pressure?
What percentage increase in volume takes place in the contents of a kerosene tank when the tempeature is raised from 4oC to 325k?
A vessel contains 2 litres of gas at a pressure of 300 kPa and a temperature of 27oC. 3 litres of gas at the same temperature and pressure are forced into the vessel.
The spring constant is such that to compress the spring 100 cm a force of 360 kN is needed. At the end, the pressure in the cylinder is 7 MPa. Obtain: a) final state properties. b) the work done for
An 1800-W electric resistance heating element is immersed in 40 kg of water initially at 20oC. Determine how long it will take for this heater to raise the water temperature to 80oC.
What is the maximum length of longitudinal through crack that can be permitted with a safety factor of 3, if the material has a fracture toughness Kic=50 MPa sqrt(m)?
Sketch the process in series on P-V coordinates. Evaluate the (a) volume at state 2, in ft3, (b) work for each process, in Btu.
The initial guesses for the root are assumed to be x0=3 and x1=2 . Given f (3) =28 and f (2)= 4 , what is the angle the secant line makes with the x -axis?
The compression process is adiabatic, and temperature at the compressor exit is 140F. Determine the mass flow rate of refrigerant, in lbm/min.
All other aspects of the operation follow the ideal cycle. You must draw a schematic for this problem. Determine the net work developed per unit mass of steam flow, in Btu/lbm.