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Mechanical Engineering

Energy Analysis Of Closed Systems

A 4 x 5 x 7 m room is heated by the radiator of a steam heating system. The steam radiator transfer heat at a rate of .... Please show all work step by step and include all applicable formulas. (See attached file for full problem description)

Steam enters a turbine operating at steady-state at

Steam enters a turbine operating at steady-state at 700 ºF and 600 lbf/in2 and leaves at 0.6 lbf/in2 with a quality of 90%. The turbine develops 12,000 hp, and heat transfer from the turbine to the surroundings occurs at a rate of 2.5x106 Btu/h. Neglecting kinetic and potential energy changes from inlet to exit, determine the

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

I would like help please

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

Maximum shear force and strain energy

(See attached file for full problem description) 1. What is the maximum shear force for the beam and loading shown? 2. What is the maximum bending moment for the beam and loading shown? 3. At point P on this Mohr's circle, . What is the maximum value of the shear stress? 4. For the beam and loading shown, the eq

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

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

Value of inductance

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)

Radius of gyration

(See attached file for full problem description) A rigid body weighing 5 slugs has a moment of inertia about the x-axis of 125 slug ft^2. The radius of gyration about the x-axis is: a. 10ft b. 25ft c. 30 ft d. 5 ft

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

Please see attached for my questions on the spring constant and natural frequency of some given systems.

Bullet and Wood Block

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

A ball with a mass of 0.25 kg is thrown vertically upward

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

Linear or non differential equation

Please see attached file for equation a. Linear, time-invariant b. Linear, constant-coefficient c. None linear, time-variant d. Both a and b