Mechanical Engineering Answers

A short reinforced concrete column of section 200 mm x 220mm is to be reinforced with 4 numbered steel bars and is required to carru an axial load of 850kN. The stress in the concrete must not exceed 7N/mm^2 and the stress must not exceed 150N/mm^2. Determine the diameter required for the bars and the subsequent stresses occurring in the concrete and the steel under the specified load. (Young's moduli of concrete=14kN/mm^2 and Young's moduli of steel=210kN/mm^2. With suitable sketch

A container (with a movable piston) contains 20.0 L of compressed nitrogen gas at 10.0 bar and 25.0 oC. Calculate q, w, ∆ U and ∆H as one lets the gas expand reversibly and isothermally to a pressure of 1.00 bar.

A student is sitting in the sun reading the exam. He has brought with him a bottle of 1.00 L of water. After 2 hours the temperature of the water has increased from 4 ° C to 20 ° C. During these two hours the sun / surroundings have supplied the water -66.90 kJ. Assume that the volume of 1.00 kg of water is 1.00 L and calculate the heat capacity of the water.

[Cosxloh(2y-8)+1/x]dx+(sinx/y-4)dy=0

Question 3 While rotating a metal bar in a particular case, the tool life was found to increase from 25 minutes to 50 minutes when the cutting speed was reduced from 100 m / min to 80 m / min. How old would this tool be if it was formed at a speed of 90 m / min?

QUESTION 3 During turning a metallic rod at a given condition, the tool life was found to increase from 25 minutes to 50 minutes when cutting velocity was reduced from 100 m/min to 80 m/min. How much will be the life of that tool if machined at 90 m/min?

Assuming we are using the F550 + E310 + 4 cell battery with a 200g onboard computer and a laser (270g), what is the thrust to weight ratio of the platform? (We use the term "weight" and "thrust" loosely. Except for Thrust/Weight and Propeller, all units are in grams)

You observe the response of a system shown in the figure below


What should you do to decrease the oscillations in the response?


Decrease the proportional gain (K_pK
p
​ )


Increase the integral gain (K_iK
i
​ )


Increase the derivative gain (K_vK
v
​ )


Increase the proportional gain (K_pK
p
​ )

Your assignment will be to solve for the stress on the legs and find critical points. You will be provided with two weights; one where the vessel is empty, and the other will be for when the vessel is filled with water.
1100 cuft [Empty weight = 31000 lbs. Water filled = 92000 lbs.] (file name is 1100 cuft_parallel bars), and i have the solid works files if needed

To a closed system, 150kJ of work is supplied. If the initial volume is 1.6m^3 and the pressure of the system changes as P=(8+4v) P in bar and v in m^3, determine the fluid volume and pressure of the system