Mechanical Engineering Answers

A ball is thrown at angle of 30° above the horizontal with a speed of 10 m/s. After 0.5 sec, find the horizontal component of its velocity.

A golf ball is driven with a velocity of 60 m/s at an angle of 37° above the horizontal. It strikes a green at a horizontal distance of 250m from the tee. What was the elevation of the green above the tee?

A ball is thrown with an initial horizontal velocity of 30 m/s from a height of 3m above the ground and 40m from a vertical wall. How far from the wall will the ball rebound for the first time? 

A golf ball is driven horizontally from an elevated tee with a velocity of 27 m/s. It strikes the fairway 2.5 sec later. How far has it fallen vertically?

The crank and connecting rod of a theoretical steam engine are 0.5 m and 2 m long respectively. The crank makes 180 r.p.m. in the clockwise direction. When it has turned 45° from the inner dead centre position, determine : 1. Velocity and acceleration of the piston 2. Angular velocity and angular acceleration of the connecting rod 3. Velocity and acceleration of point E on the connecting rod 1.5 m from the gudgeon pin 4. Position and linear velocity of any point G on the connecting rod which has the least velocity relative to crank shaft 

In a four bar chain ABCD, AD is fixed and is 150 mm long. The crank AB is 40 mm long and rotates at 120 r.p.m. clockwise, while the link CD = 80 mm oscillates about D. BC and AD are of equal length. Find the angular acceleration of link CD when angle BAD = 60°

Question No. 18: (a) In an epicyclic gear train, an arm carries two gears A and B having 36 and 45 teeth respectively. If the arm rotates at 150 r.p.m in the anticlockwise direction about the centre of the gear A which is fixed, determine the speed of gear B. If the gear A instead of being fixed, makes 300 r.p.m in the clockwise direction, what will be the speed of gear B?

(b) Prove that the resultant unbalanced force is minimum when half of the reciprocating masses are balanced by rotating masses.

Question No. 18: (a) In an epicyclic gear train, an arm carries two gears A and B having 36 and 45 teeth respectively. If the arm rotates at 150 r.p.m in the anticlockwise direction about the centre of the gear A which is fixed, determine the speed of gear B. If the gear A instead of being fixed, makes 300 r.p.m in the clockwise direction, what will be the speed of gear B?

(b) Prove that the resultant unbalanced force is minimum when half of the reciprocating masses are balanced by rotating masses.

In a single open feed water heater regenerative cycle, the steam enters the turbine at 30 bar, 400°C and the exhaust pressure is 0.10 bar. The feed water heater is a direct-contact type which operates at 5 bar. Find (a) the efficiency, heat rate and steam rate of the cycle

 A rigid tank initially under atmospheric pressure, contains oil (poil = 850 kg per metre cube) and water (Awater = 1000 kg per metre cube). Air is then charged into the tank to increase the total pressure up to 1 MPa gage. Determine the total downward movement of the free surface of the oil. Take average values of elastic bulk modulus for oil and water as 2050 MPa and 2075 MPa, respectively. Air 200 mm Oil 600mm Water 700 mm 300 mm