Mechanical Engineering Answers

A particle moves along a straight line such that at any instant t in seconds,the displacement s in metres is given by the equation s=t^3+15t^2+63t-40.
Find the distance covered by the starting point to the point when the particle is momentary at rest.
Find the velocity of the particle when acceleration is zero

Explain the concept of obtaining a reflection about an arbitrary line starting from the plain reflection about an axis. How do you obtain the orthographic projections of 3D geometric data base?

The arrival rate of customer at a banking counter follows a ppoisson distribution with a mean of 30 per hours.The service rate of the counter clerk also follows poisons distribution with mean of 45 per hour.1)What is the probability of having zero customer in the system.2)What is the probability of having 8 customer in the system.3)What is the probability of having 12 customers in the system

A1500kg automobile travels eastward at speed of 8m/s it makes a 90°turn to the north in a time of 3 s and continues with the same speed find
a) impulse delivered to the car as a result of the turn
b) average force exerted in the car during the turn
c) average force of the car in the road during the turn

A double pipe heat exchanger has an effectiveness of 0.5 when the flow is counter- current and the thermal capacity of one fluid is twice that of the Other fluid. Calculate the effectiveness of the heat exchanger if the direction is of flow of one of the Fluids is reversed with the same mass flow rates as before?

A mixture of air and water vapour at 1.013 bar and 16 degree C has a dew
point of 5degree C. Calculate the relative and specific humidity’s?

Four kg of water is placed in an enclosed volume of 1m3. Heat is added until the temperature is 150°C. Find ( a ) the pressure, ( b )the mass of vapor, and ( c ) the volume of the vapor.

Steam at 7 bar , dryness 0.9 , expands in a piston cylinder assembly at constant pressure until the temperature is 200 C . CALCULATE THE WORK DONE AND HEAT SUPPLIED PER KG OF STEAM DURING THE PROCESS

An ideal Otto cycle has a compression ratio of 8 and takes
in air at 95 kPa and 15oC, and the maximum cycle temperature is
1200oC. Determine the heat transferred to and rejected from this
cycle, as well as the cycle’s thermal efficiency.

An ideal Otto cycle has a compression ratio of 10.5, takes in
air at 90 kPa and 40oC, and is repeated 2500 times per minute. Using
constant specific heats at room temperature, determine the thermal
efficiency of this cycle and the rate of heat input if the cycle is to
produce 90 kW of power.