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Mechanical Engineering

Method of Joints: Tension or Compression

(a) Find the reactions A and D {see attachment for diagram} (b) Use the Method of Joints to determine the force in each member. Indicate the magnitude of the force whether the member is in tension or compression.

Dynamics Problem

At the instant that an object travels horizontally with a velocity of "v", passes at an elevation of "h" above a second object, the second object is released at an angle "x" to the horizontal with a velocity... (PLEASE SEE ATTACHMENT FOR COMPLETE PROBLEM AND DIAGRAM)

Dynamics Problem

An object turns about a center with constant tangential speed of 5.425m/s. The object is attached to the center by means of a cord of length 2m, and of negligable weight. Determine the values of radius of rotation "R" and "h". (See attachment for full question)

Dynamics Problem

In the pulley system shown, object "A" moves downwards with a velocity of 3m/s. Determine the magnitude and direction of the velocity of object "B".

Measuring Tension (Mechanical Eng.)

The 10-kg square plate shown is supported by three vertical wires. Determine the tension in each wire when a = 65mm. (FOR DIAGRAM PLEASE SEE ATTACHED.)

Statics: Finding Force Exerted and Reaction

A small hoist is mounted on the back of a pickup truck and is used to lift a 12kg crate. Determine (a) the force exerted on the hoist by the hydraulic cylinder BC, (b) the reaction at A.

Apt Program

Write the apt geometry and motion statements for the workpart shown.

NC Programming

Create an nc part program for making the slot shown in the attachment.The cutter diameter is 3/16 inch. The starting point is (0,0) at 2 inches to the left and 2 inches below the lower left corner of the part. There is also an example with a fully worked out solution included in the attachments. Write also the apt geometry and

Nc part program

Explain the difference between the following parts of nc programs: (a) N001 G01 G41 X005 Y017 EOB N002 EOB (b) N001 G41 E0B N002 G01 X005 Y017 EOB

Dynamics

Determine the position of the following system at t = 10 s (see attachment)

Manometers

2) See attachment for diagrams for both questions. 1) Two water manometers are connected to a tank of air. One leg of the manometer is open to 100kPa absolute pressure while the other leg is subjected to 90kPa. Find the difference in deflection between both manometers, delta ha - delta hb. 2) The inclined differential

Beam deflection and Stress at centroid?

Sometimes the term centroid throws me for a loop. So, how would I set this problem up? I'm asked to determine the deflection of the tip of a beam and max direct stress and location for a 2000N load. Given load=2000N, on the tip of a 1m beam. Beam dimensions are H=80mm B=W=40mm and t=thickness of 1.5mm.

Expression for a Floating Cube

a. The attachment shows a cube floating in a fluid. Derive an expression relating the submerged depth X, the specific weight of the cube, and the specific weight of the fluid. b. If the cylinder in the second attachment, made of a uniform material, is placed in fresh water at 95 degrees Celsius, how much of its height would

Determine modal ratios

For the two degrees of freedom structure shown, what are the values of the modal ratios if m1 = m2 = m, k1 = k, and k2 = 3k See Attached for question and details.

Determine frequency ratios

In the idealized model shown (See Attached) m = slug, k = 9 lb/ft and the viscous damping factor is 0.15. For what range of requency ratios will the magnification be greater than 1? (please see attached for details)

Determine Viscous Damping Coefficient C

A Mass-Spring-Damper is tested to determine the value of the viscous damping coefficient c. Assume k = 10 lb/ft and m = 2 slug. The vibrational amplitude is observed to decrease by 33% of its initial value after two consecutive cycles. What is the value of the viscous damping coefficient c? a. 0.9376 b. 0.8442 c. 0.779

Find the fuel consumption

In the an ideal turbo jet, the engine is designed such that the turbine work is divided equally between the compressor and the propeller. The gas from the turbine discharges to a nozzle for additional thrust. Consider such an engine where the air enters the diffuser at 200 m/s, 40 kPa, 240 K, and a flow rate of 40 kg/s. The comp

Force, acceleration and mass

What force is required to accelerate a body with a mass of 15 kilograms at a rate 8/S2 ( the 2 is small obove the s)? a. 1.875 kg b. 23 kg c. 23N d. 120N

Mechanics: Efficiency of the Machine

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? a. 92 percent b. 94 percent c. 96 percent d. 97 percent?

Question about Multipal choice question on mechanics

A car with a mass of 2,000. kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters. What is the centripetal force on the car? a. 625 N b. 703N c. 15,625 N d. 20,250 N

Apparent Density, Theoretical Density and Void Volume

A compacted body of iron powder is sintered into a 20mm-diameter, 45-mm-tall cylinder which, upon weighing, is found to have a mass of 98g. Calculate the apparent density, the percentage of theoretical density, and the void volume (porosity) in percent.

Tensile stress

A bar of steel 1 by 1½ in cross section and 6 in long is subjected to a pull of 6000 lb. What is the average tensile stress in the bar?

Brayton Cycle Gas Turbines

Large stationary brayton cycly gas turbine power plant delivers a powr output of 100MW to an electric generator . Minimum temperature is 300K so T1= 300k max temp is 1600k so T3= 1600k Minimum pressure in the cycle is 100kpa compressor pressure ratio is 14 to 1 so p2/p1 = 14 but turbine efficiency is 85% and compressor efficienc

Mobility and transit time

Consider the 2.0micrometer long GaAs device where the E-field is 5kV/cm and Mn*=.067M0. (a) Calculate the transit time of an electron through the device if the mobility is 8000 cm^2V-s. (b) The mean free path of an electron (average velocity x scattering time) is the average distance an electron travels between two consecu