Mechanical Engineering Answers

Weight 0.153N determine the specific weight, density and specific gravity of the juice express you answer in si unit

A bowling ball has a mass of 6 kg, a moment of inertia of 1,6 10^-2 kg.m², and a radius of 0,2 m. If it rolls down the lane without slipping at a linear speed 8 m/s, what is its total energy?

A closed system has 150 KJ of work supplied when the initial volume is 0.6m^3 and pressure of the system changes in the relation p = 8-4V, where V is in m^3 and p is in bar. Compute the final pressure and volume of the system. Express your answer in Pa and m^3

Choose any real time structural or machine component, part, and member subjected to loading

that you are familiar with (e.g. a beam). The chosen problem should be complex enough that you can

write something about it, but not so complex that you get bogged in a lot of details.

Thorough analysis is expected in terms of:

a. Problem statement with design limitations, requirements with assumptions.

b. Complete analytical calculations with proper description

c. Proper drawing of the component, part or member with dimensions and application of loads.

d. Free body diagram, shear force diagram, and bending moment diagram wherever necessary.

e. Normal and shear stress distributions wherever applicable.

f. Factor of Safety.

deduce an expression for the offset for a disc harrow.

A roller of radius r = 300 mm and weight 2000 N is to be pulled over a curb of height  150 mm (see Fig.1) by a horizontal force P applied to the end of a string wound tightly  around the circumference of the roller. Find the magnitude of P required to start the roller move over the curb. 

 3 examples of why you would use an assembly

A thin disk of radius r rolls back and forth in a spherical dish of radius R without slipping.

Use energy considerations to show that the motion is simple harmonic for small displacements of the thin disk from its equilibrium position and deduce an expression for the period of the oscillations.

QUESTION 3

a. A certain engine develops a torque of 120 Nm while running at a speed of 3000 rev/min. Calculate the brake power. Take pie =3,142. (5)

b. An indicator diagram taken from a single-cylinder 4-stroke engine has an effective area of 600 mm2

If the base length of the indicator diagram is 60 mm and the constant is 80 kPa/mm calculate the indicated mean effective pressure

A 5 cm diameter shaft is stepped down to 4 cm with a fillet radius of 5 mm. If the allowable shear stress of the shaft material is 55 MPa, determine the maximum torque that can be transmitted by the shaft. (Do not ignore the stress concentration factor.)