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# Mechanical Engineering

### A piston-cylinder device initially contains 50L

A piston-cylinder device initially contains 50L of liquid water at 40 degrees C and 200kPa. Heat is transferred to the water at constant pressure until entire liquid is vaporized. (a) What is the mass of the water? (b) What is the final temperature? (c) Determine total enthalpy change. (d) Show process on a T-v diagram with

### A piston-cylinder device contains 0.8kg of steam at 300 degrees C and 1 MPa

A piston-cylinder device contains 0.8kg of steam at 300 degrees C and 1 MPa. Steam is cooled at constant pressure until one-half of the mass condenses. (a) Show the process on a T-v diagram. (b) Find the final temperature (c) Determine the volume change.

### A 7 cm orifice meter is being used to measure the flowrate

A 7 cm orifice meter is being used to measure the flowrate of 50C water. The mercury manometer shows a height of ... (See attached file for full problem description)

### 350 gpm of 120F water are being pumped through the system

350 gpm of 120F water are being pumped through the system shown. All pipe is 4" copper tubing. (See attached file for full problem description)

### Gasoline at 30C flows upward from the 2" schedule 40

Gasoline at 30C flows upward from the 2" schedule 40 steel pipe to the 30" schedule steel pipe. (See attached file for full problem description)

### Buoy Problem - Center of Gravity

(See attached file for full problem description) A cylindrical buoy two meters in diameter and six meters high is floating upright in seawater as shown at 20 degrees C. The buoy contains weather recording instrumentation and has a mass of 12,000 kg. Its center o gravity is 2 meters above the bottom. a) Determine the depth

### Psychrometry

Please solve the problem using an atmospheric pressure of 85 kPa. Do not use a psychrometric chart but from first principles using formulae. I think you need to use steam tables: In an air-conditioning unit 3.5 m^3/s of air at 27 degrees Celsius dry-bulb temperature, 50% relative humidity and standard atmospheric pressure enter

### Length of stroke, cylinder bore, clearance volume, thermal efficiency

The four cylinders of a four-stroke spark-ignition petrol engine have a total capacity (swept volume) of 1200 cm^3. The stroke-bore ratio is 1.1, the compression ratio is 9.5 and the ratio of the specific heats (y) is 1.41. Determine: (a) the length of stroke (b) the cylinder bore (c) the clearance volume per cylinder

### A gas turbine takes in air at 300 K and discharges it to the combustion chamber at 620 K

A gas turbine takes in air at 300 K and discharges it to the combustion chamber at 620 K. See attached file for full problem description with diagram. Determine: a/ the theoretical compressor power input b/ the theoretical turbine power output c/ the thermal efficiency of the turbine d/ the work ratio of the turbine

### Power transmission velocity

(See attached file for full problem description) A four car linkage is shown in the attachment. The crank OA, the connecting rod AB, and the rocker BC are 20mm, 120mm, and 60mm long respectively. The crank rotates at a speed of 60 rpm and the centre distance OC is 90mm. At the instant shown determine: (I) The velocity of C

### Components and Force of a Timber and a Wall

A timber of uniform cross section with a mass of 90 kg is hinged at its lower end and held at angle of 60 degrees with the horizontal by a rod attached as shown in (attached figure 4-6) A cylinder which has a mass of 30 kg is placed between the timber and the wall. 1) What are the horizontal and vertical components of the r

### Estimate the ultimate steel strength

A steel member has a Brinell of HB =250. Estimate the ultimate strength Su of the steel in MPa. a. 852.5 MPa b. 250.5 MPa c. 100.5 MPa

### Centrifugal force question

In the speed-regulator system of the attached diagram, it has a mass of 1 kg. The frequency needed to maintain the configurations shown in the diagram is calculated as 6.145 rad/s. Calculate the centrifugal force of the system. a. 0.577 N b. 0.230 N c. 0.410 N d. 0.313 N

### Frequency Calculation from L and C

For the circuit shown, the capacitance has a value of 50 microfarad. Calculate the value of inductance L that will make the oscillation occur at the frequency of 400HZ. a. 0.0127 H b. 0.0032 H c. 0.002 H d. 0.0045 (See circuit diagram in attached file).

### Output-input amplitude

(See attached file for full problem description) Consider the attached transfer-function system. Solve for the output-input amplitude ratio given the sinusoidal input.

### Combined Resistance Between Two Points

The resistors R1, R2, and R3 are connected in a triangular shape as shown. Obtain the combined resistance between point A and B. (See attached file for full problem description).

### Spring-mass system problem

For a spring-mass system the spring constant is 245 N/m and the mass is 22 kg. The natural frequency of this system is: a. 2.1 rad/s b. 2.6 rad/s c. 3.34 rad/s d. 5.2 rad/s

### Equation of Motion of a System

See attached file for full problem description on the system.

### Bullet and Wood Block Problem

A bullet is fired horizontally into a wood block resting on a horizontal, frictionless surface. If the mass of the bullet is 0.02 Kg and the velocity is 600 m/s, what is the velocity of the wood block after the bullet is embedded in it? Assume the wood block has a mass of 50 kg. a. 1 m/s b. 2 m/s c. 2.5 m/s d. 0.24 m/s

### Time & Distance Before a Car Stops

A brake is applied to a car traveling at a constant speed of 25 m/s. If the deceleration caused by the braking action is 5 m/per second squared, find the time before the car stops. a. 1s b. 2s c. 4s d. 5s Determine the distance traveled before the car stops, IF the car stops at t = 5 seconds. a. 52.5 m b. 62.5 m c. 25

### Kinetic Energy & Stopping Force of a Car

A car of mass 1500 kg is moving with a speed of 50 km/h (13.89 m/s). Determine the kinetic energy T of the car. (see options a through d in attached file) Now determine the force required to stop the car at a distance of 50 m, if the kinetic energy T is 1.447 x 10E5 N-m. 10E5 means 10 to the 5th power. a. 1447 N b. 289

### Determining Time to Reach Maximum Height

A ball with a mass of 0.25 kg is thrown vertically upward with an initial velocity of 10 m/s. What is the velocity of the ball when it reaches the highest point? a. 10 m/s b. 0.25 m/s c. 0 m/s d. Can not be determined How many seconds would it take for the ball to reach its maximum height. a. 10s b. 1.02 s c. 0.25 s d

### Inverse Laplace Transform

Inverse Laplace Transform. See attached file for full problem description.

### Laplace transform of unit impulse

See attached file for full problem description. a. b. 1 c. d. 0

### Two flat, rectangular plates with a lateral dimension

Two flat, rectangular plates with a lateral dimension w*l lie parallel, one above the other, a distance h apart. The gap between them is filled with molten polymer. One plate is fixed; the other moves parallel to it in the direction of the dimension l at velocity v, causing the fluid to be sheared. Show that the fluid is displac

### Mechanical Vibrations Questions

(See attached file for full problem description with diagrams) Mechanical Vibrations Question No.1 A pulley 250mm in diameter drives a second pulley 1000mm diameter by means of a belt.The mass moment of inertia of the drive pulley is 0.2kg-m2. The belt connecting these pulleys is represented by two springs, each of stiffness

### Axial compressive load - southern pine column

Design a square or rectangular (2-in. nominal increments) pin-connected southern pine column (S4S). The unbraced length of the column is 16ft. The column is to support an axial compressive load of 60,000 lbs.