Mechanical Engineering Answers

A screw jack is to lift a load of 80 kN through aheight of 400 mm. The elastic strength of screw material in tension and compression is 200 MPa and in shear 120 MPa. The material for nut is phosphorbronze for which the elastic limit may be taken as 100 MPa in tension, 90 MPa in compression and 80 MPa in shear. The bearing pressure between the nut and the screw is not to exceed 18 N/mm2. Design and draw the screw jack. The design should include the design of 1. screw, 2. nut, 3. handle and cup,and 4. body

The crank OP of a crank- and slotted-lever mechanism rotates at 100 rpm in the counter-clockwise direction. Various lengths of the links are OP = 90 mm, OA = 300 mm, AR = 480 mm and RS = 330 mm. The slider moves along an axis perpendicular to AO and is 120 mm from O. Determine the velocity of the slider when the AOP is 1350 .

Determine h0 and e using the following given parameters: μ = 0.02756 Pa, N = 30 rev/s, W = 2210 N (bearing load), r = 19mm, c = 0.038 mm, and l = 38 mm. Also, determine the co-efficient of friction, the torque to overcome friction, power loss to friction, total volumetric flow rate Q, side flow rate Qs, maximum film pressure and the location of maximum and terminating pressures.

In designing a radio tower at an airport, engineers must take into account the ascent rate (slope at which a plane can take off) such that planes will not collide with the tower. If the most shallow ascent rate is found to be 9% (the plane climbs vertically 9 ft for every 100 ft of horizontal travel), and the tower is 300 ft tall, how far can the tower be safely placed from the end of the runway?

One contemporary issue related to mechanical engineering

An important diamensionless parameters in certain type of fluid flow. problem is froude number define as v/√gl where v= velocity g=acceleration l = length

Determine the froude number for v=10ft/s² g =32.2ft/s² =2ft. Recalculate the froude number using si unit for v,g,and l . Explain the significance of the result of these calculation

Air is enclosed by a rigid cylinder containing a piston. A pressure gage attached to the cylinder indicate an initial reading of 25Psi. Determine the reading Gage when the piston has compressed to air to one-third it's original volume assume the compression process to be isothermal and the local atmospheric pressure to be 14.7Psi

When shock absorber dump out oscillation cause by road roughness, describe how temperature change may affect the operation of a shock absorber

Estimate the increase in pressure in(Psi) required to decrease a unit volume of Mercury by 0.1%

A tank contain 500kg of liquid whose specific gravity is 2. Determine the volume of the liquid in the tank