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The bars AB and AC are joined by a pin at A and a horizontal cable. The vertical cable carrying the 200-kg mass is attached to the pin at A. Determine the tension in the horizontal cable. Neglect the weights of the bars.
Determine the tension in horizontal cable in N
True or False: The precise way to get the right drill bit size in pre drilling is to match the shank size with the drill bit size
a lump of steel of mass 8 kg at 1000 k is dropped in 80 kg of oil at 300 k. calculate the entropy change of steel the oil and the universe. take specific heats of steel and oil as 0.5 kj/kg K and 3.5 Kj /kg K respectively.
The motion of a cylinder of radius r is controlled by a cable AG. Knowing that end G of the cable has a
velocity of VG = 0.3 m/s and an acceleration of aG, = 0.5 m/s' , both directed upward, and that r = 0.15 m
determine the acceleration (a) of point B and of point D, (b) the velocity and acceleration of point E.
For the hydraulic motor shown below, the pump pulls linseed oil from tank A via a 3 ½”
Sch40 steel pipe at a flow rate of 620 L/min. The pump is rated at 30hp and has an efficiency of 80%. If the pipe from the pump outlet to the hydraulic motor is 2” Sch40 steel pipe and the pipe from the motor outlet back to tank A is 3 ½” Sch40 steel pipe and the following data are known:
1.Energy loss from tank A to the pump inlet is 6.2 Nm/N.
2.Energy loss from pump outlet to inlet to hydraulic motor is 1.2 Nm/N.
3.Energy loss from outlet of hydraulic motor to tank A inlet is 2.5 Nm/N.
Ignoring all other losses, compute the following:
1. Pressure at the pump inlet.
2. Pressure at the pump outlet.
3.Pressure at the hydraulic motor inlet.
4.Pressure at the hydraulic motor outlet.
5.Power removed from the fluid by the hydraulic motor
Convert the following arithmetic expressions from infix to reverse Polish notation.
a. A * B + C * D + E * F
b. A * B + A * (B * D + C * E)
c. A + B * [C *D + E *(F + G)]
d. (A + B) * [C * (D + E) + F]
How many characters per second can be transmitted over a 1200-baud line in each of the following modes? (Assume a character code of eight bits.)
a. Synchronous serial transmission.
b. Asynchronous serial transmission with two stop bits.
c. Asynchronous serial transmission with one stop bit.
A DMA controller transfers 32 bit words to memory using cycle stealing. The words are assembled from a device that transmits characters at a rate of 2400 characters per second. Each character is 8 bit length. The CPU is fetching and executing instructions at an average rate of 1 million instructions per second. By how much will the CPU be slowed down because of the DMA transfer?
Task 1
Table T1 lists experimental data for a tensile test performed on a novel high strength composite material for structural trusses.
Displacement (mm) 0 1 2 3 4 5 6 7 8 9 10
Tensile Stress (GPa) 0 10 14 16 18 19 20 21 22 23 23
Table T1. Tensile test to failure on composite material
a) Plot the data and identify the function type that best describes the data.
[Marks: 4/100]
b) Use linear regression to estimate the parameters of the function above. Check the effectiveness of your curve fitting parameters by plotting the experimental data (i.e. Table T1) and the data of your model fit. Also calculate the sum of the squares of the residuals (J) and the coefficient of determination (r2) to discuss about the quality of your model fit.
3.2. Nitrogen (molar mass 28 kg/kimol) expands reversibly in a perfectly thermally (insulated) cylinder from 3.5 bar, 200°C to a volume of 0,09 m°. The initial volume occupied was 0.03 m". Assume nitrogen to be a perfect gas and take Cy = 0.741 kJ/kg K. Calculate the work done.
