Mechanical Engineering Answers

A bullet is fired with initial velocity of 100 m/s from the hill at point P at an angle of 30° with the horizontal and it strikes at 80 m lower than P. Neglecting air resistance and by using the concept of linear and curvilinear motion, find (a) the horizontal distance from the gun to the point where the projectile strikes the ground, (b) the greatest elevation above the ground reached by the projectile.

The angular acceleration of an rotating body is define by the relation 𝔞 = - kθ. Determine a) the value of k if angular velocity is 8 rad/sec at angular displacement of 0 radian and angular velocity is 0 rad/sec at angular displacement of 4 radian. B) find the angular velocity at angular displacement of 3 radian.

Determine the force in each member of the truss and state if the members are in tension

or compression. Take P = 100 kN.

An ideal reheat turbine with one stage of reheat receives steam at 8.0 MPa,

480°C. Reheat pressure is 0.83 MPa and exhaust pressure is 0.007MPa. The

work is 1559 KJ/kg and the thermal efficiency is 41.05%. Find the

temperature of steam leaving the reheater.

A reheat cycle with two stages of reheating is executed, with steam expanding initially from 90 bar and 530°C. The two reheater pressures are 10 bar and 0.6 bar, the steam leaves each reheater at 480°C. Condensation occurs at 0.03 bar. For an ideal cycle, Find the following: a. Heat supplied and efficiency b. For the engine, ignore the pressure drop through the reheaters, let the engine operate through the same states and compute Work engine and efficiency. c. What is the steam flow rate for an engine output of 20,000KW?

Q2: Find (i) acceleration of the masses and (ii) tension in the two strings. Take coefficient of friction for the contact surfaces of bodies A and B as 0.3. 15 kg B T A 12 kg A T B 20 T A C T B 45 kg

7. Determine the specific volume, internal energy and enthalpy of compressed liquid at 120 o C

and 15MPa.

6. A 0.09 m 3 drum contains saturated liquid-vapor mixture at 280 O C. Find the mass of each

phase if their volumes are equal and what is the percent quality of the mixture.

5. Ten kilograms of steam at 1.1 MPa has an internal energy of 31,228 kJ. Determine a) its

temperature , b) Total enthalpy.

3. Determine properties of saturated vapor if its temperature is 228 o C.