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1. The device shown is designed to prevent clockwise rotation in the horizontal plane of the central wheel by means of frictional locking of the two small rollers. For given values of R and r and for a common coefficient of friction µ, at all contact surfaces, determine the range of values of d for which the device will operate as described.
2. A scissors-type jack with a single square thread which engages the threaded collar G and turns in a ball thrust bearing at D is being designed. The thread is to have a mean diameter of 10 mm and a lead (advancement per revolution) of 3 mm. With a coefficient of friction of 0.20 for the greased threads,
(a) calculate the torque M on the screw required to raise a load of 1000 kg from the position shown and
(b) calculate the torque M required to lower the load from the same position. Assume that platform AB and line DG will remain horizontal under load. Neglect friction in the bearing at D.
air undergoes a polytropic expansion process in a piston-cylinder assembly from 75 psia and 300 f to 15 psia. employing
for each kw of power input to an ice maker at steady state determine the maximum rate that ice can be produced in kgs
for a four bar linkage with r1 6in r2 3 in r3 4in r4 4 in and initially in a non-crossed configuration opena find
Calculate the conduction heat loss for the following wall: 15ft long, 8ft tall. Calculate for 8 hr, inside temperature at 78F and the outside temperature at 3F. Wall components from outside to inside are brick; 1.2cm(1/2 in.) plywood; wood studs, 5x1..
A small vapor-compression refrigeration unit is to be built into a recreational vehicle and is designed to operate on a 12-volt electrical system. The refrigerator has a cooling capacity of 500 W and uses R-134a. The refrigerant enters the compressor..
a cylindrical storage tank with dimensions of 15 m height and 15 m inside diameter is used to store oil having a
It is desired to create a hydroelectric dam in South Carolina that will produce 1,000 kW of power. Knowing that the flow of the water through the dam can be 400 gal/s, what is minimum allowable height of the dam required to achieve the power goal?
an automobile wheel test rig consists og a uniform disk a of mass ma 5500 kg and radius ra1.5 m that can rotate freely
neglecting the effects of radiation absorption emission and scattering within their atmospheres calculate the average
A vortex tube is used to separate an ideal gas at 10 bar and 375 K such that half the gas is collected in a cool stream at 1 bar and 255 K and the other half becomes a hot stream at 1 bar and 495 K. Assuming the process is adiabatic: is this process ..
consider a household 120 v two-plug electric outlet protected by a 15 a circuit breaker. a you plug in a hair dryer and
a 10-lb block is attached to an unstretched spring of constant k12lbin. the coefficients of static and kinetic friction
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