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A diagnostic test is designed to detect a cancer precursor enzyme that exists in 1 of every 1000 people. What is the percent chance that a person identified as having the enzyme actually does have the
The wheel on a press is 25 inches in circumference, and there are 5 threads to the inch. How much resistance on the book will a 40 lb effort force on the wheel produce?
A newly developed diagnostic test indicates that 80% of students predicted to score 100% on an exam actually do. The diagnostic test has an accuracyof 90%.
An internal crack has been detected with ultrasonics in the shell of a large cylindrical steel pressure vessel. The stresses in the region of the crack are: (longitudinal tensile stress of 60,000 ps
A jack having a pitch of 1/2 inch has a lever, the outer end of which passes through a circle 9 feet in circumference. What force can be raised by an effort of 20 pounds?
A four foot diameter reel of wire pays out 250 feet of conductor wire in two minutes. What is the average angular velocity of the reel in rpm. Provide step by step explanations.
The performance of a device is defined as the ratio of the desired output to the required input, and this definition can be extended to nontechnical fields.
A fine copper wire(0.07-cm diameter) is initially heated to 175C. The wire is suddenly exposed to an environment at 40C with a heat-transfer coefficient of 60W/(m^2*C).
Water vapor enters a compressor at 50 kPa and 150 C, and leaves at 400 kPa with the same specific entropy as at the inlet. What is the temperature of the water at the compressor exit.
Based on inernal energy considerations, what dislocation density in Cu is needed to make the crystalline form of Cu unstable with respect to the liquid form? What would be dislocation spacing be at
What is the approximate ductility (%El) of a brass alloy that has a yield strength of 275MPa? What is its Tensile strength?
A single crystal of aluminum is oriented for a tensile test such that its slip plane normal makes an angle of 30o with the tensile axis. Three possible slip directions make angles of 58.4o, 72o, and
Consider a single crystal cylindrical specimen of iron oriented such that a tensile load is applied along a [010] direction. The diameter of the specimen is 0.5 cm.
In a PEM fuel cell, there are catalyst particles dispersed in the catalyst layer (CL) to increase the electrochemically active area. You model this as jo=jo sigma, where sigma is the catalyst layer
Consider a large vessel divided into two chambers by a dividing nwall, such as that described in lecture on 23 Feb. The vessel and its contents are at 298 K and the dividing wall is 0.001 m thick ru
The yield stress of a tension specimen machined from a 0.5 m wide by 0.6 cm thick copper sheet is 145 MPa. The sheet is rolled further in the plane of the sheet with an applied tensile force of 0.22
The 50-mm radius pulley A of the clothes dryer rotates with an angular acceleration of alpha = 24*(theta)^(1/2) rad/s^2, where theta is in radians. Determine its angular acceleration when t = 2s, s
Determine the horsepower input for a motor necessary to lift a 200 kg box at a constant rate of 2 m/s. The overall efficiency of the system is 0.8.
A steam turbine produces 3000 hp with a mass flow rate of 22,000 pounds per hour. The steam enters at 1100 °F and 900 psi and exits at 2.5 psi.
What is the temperature at the exit of the valve in oC? what is the internal energy (kJ/kg) of the refrigerant at the exit of the valve?
An insulated,thin walled pipe of 100mm diameter is used to transport water to equipment that operates outdoors and uses the water as a coolant.
Assume the density of air is 1.16 kg/m3, and neglect the weight of the ropes and the cage. (b) Also, determine the maximum amount of load, in kg, the balloon can carry.
A single degree of freedom system has a concentrated mass weighing 38.6 lb, a spring constant of 22.5 lb/in and a damping coefficient of .6 lb-sec/in.
What is the thermal resistance associated with a wall that is 2.5m high by 6.5m wide ( having 10 studs, each 2.5m high)? assume surfaces parallel to the x-direstion are adiabatic.
Determine (a) the initial and final temperatures, (b) the mass of liquid water when the piston first starts moving, and (c) the work done during this process. Also, (d) show the process on a P-v dia