Mechanical Engineering Answers

The baggage truck A has a mass of 800 kg and is used to pull each of the 300-kg cars. If the tractive force F on the truck is = 480 N, determine:

a) The initial acceleration of the truck.

b) Forces in coupling B and C.

c) What is the acceleration of the truck if the coupling at C suddenly fails?

The car wheels are free to roll. Neglect the mass of the wheels.

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A 150mm-diameter hollow sphere weighing 300 N is attached to a solid concrete block weighing 5.3 kN. If the concrete has a specific weight of 27.7 kN/m3, what will be the state of the two

 A 150mm-diameter hollow sphere weighing 300 N is attached to a solid concrete block weighing 5.3 kN. If the concrete has a specific weight of 27.7 kN/m³, what will be the state of the two objects together in water?      

The water in an 8-m-diameter, 3-m-high above-ground swimming pool is to be emptied by unplugging a 3-cm-diameter, 25-m-long horizontal pipe attached to the bottom of the pool. Determine the maximum discharge rate of water through the pipe. Also, explain why the actual flow rate will be less.

 A shaft of 100mm diameter and 1 meter long has one of its ends fixed and the other end carries a disc of mass 500kg at a radius of gyration of 450 mm. The modulus of rigidity for the shaft material is 80 GN/m2. Determine the frequency of torsional vibration.

A motor has 5 speeds varying from 18 to 228 ram in a geometric progression

Starting from rest, you run the engines at full power and holding a straight line, you observe that the ship accelerates uniformly from 0 m/s to 10 m/s over 2.25 km. The mass of the ship fully loaded is 42500 tonnes and the average water resistance is known to be 6.5 MN. The ships engines (4 x 16 cylinder engines with a total 4500 l) are rated at 46080 kW.

a. Determine the total work done during the test.

b. Calculate the amount of power the engines delivered throughout the test. Are they delivering the rated power?

Compute all reactions at the base A of the traffic light standard, given that the tension in the cable BC is T = 544 lb. The weight of the standard is negligible compared with the 320-lb weight of the traffic light.

Starting from rest, you run the engines at full power and holding a straight line, you observe that the ship accelerates uniformly from 0 m/s to 10 m/s over 2.25 km. The mass of the ship fully loaded is 42500 tonnes and the average water resistance is known to be 6.5 MN. The ships engines (4 x 16 cylinder engines with a total 4500 l) are rated at 46080 kW.

a. Determine the total work done during the test.

b. Calculate the amount of power the engines delivered throughout the test. Are they delivering the rated power?

c. Prepare a Sankey diagram to explain the energy flow from chemical energy in the diesel fuel through to the kinetic energy of the liner indicating any losses.

Any help would be greatly appreciated. Thank you.

Tank A which is at a pressure of 1200 kPa, supplies 400 L/min of medium fuel oil to operate a hydraulic press via a 1” schedule 40 steel pipe. The medium fuel oil then exits the hydraulic press and returns to the pressurized tank A via a pump through 2” schedule 40 steel pipes. The pump is rated at 10 hp and has an efficiency of 90%. If the following data are known:

·        Energy loss from tank A to the hydraulic press inlet is 5.4 Nm/N.

·        Energy loss from hydraulic press outlet to the pump inlet is 0.8 Nm/N.

·        Energy loss from outlet of pump to tank A inlet is 1.8 Nm/N.

Ignoring all other losses, compute the following:

1.        Pressure at the hydraulic press inlet.

2.        Pressure at the pump outlet.

3.        Pressure at the pump inlet.

4.        Pressure at the hydraulic press outlet.

5.        Power removed from the fluid by the hydraulic press