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Calculate the amounts of ferrite, cementite, primary microconstituent, and pearlite in the following steels: (i) 1015, (ii) 1035, (iii) 1095, and (iv) 10130.
A house is to be maintained at 23 degrees C when the outside temperature drops to zero degrees C. The House, which loses heat at rate of 800 KJ/min, is heated by electric resistance heaters. Determ
Determine (a) the time to make one pass across the surface, and (b) the maximum material removal rate during the cut.
An insulated piston-cylinder device contains 2Kg of saturated liquid water with an electric resistance heater in the water inside the cylinder. The water remains at a constant pressure of 120KPa as
Assume that the cutting tool moves from the outer diameter of the workpiece to exactly the center at a constant speed. Determine the velocity of the tool as it moves from the outer diameter toward
In an orthogonal cutting experiment, with a 10-degree rake angle cutting tool, the chip velocity was measured to be 80% of the cutting speed. Determine the shear angle.
The current I(t) flowing in a RLC circuit with R=11ohm, L=0.1H, C=10^-2F and the source voltage E(t) = 110sin(377t) becomes steady state at time 5s. Find out the steady state current flowing in the
In an orthogonal cutting operation, the chip velocity was determined using a Laser Doppler Velocimeter (LDV) as 80 % of the cutting speed. A tool of zero degree rake angle was employed in the cuttin
A large stationary diesel engine produces 15MW with a thermal efficiency of .4. The exhaust gas which we assume is are, flows out at 800K, and the intake is 290K. How large is the mass flow rate? C
The cable is made of steel. What diameter should tar cable b so that the material does not exceed 50 percent of it's tensile strength? Value of tensile strength is 500X 10^6 N/m^2
Estimate the common logarithm of 10 using linear interpolation. For each of the interpolations, compute the percent relative error based on true value.
The compressor uses 1.6 kW of power. What is the maximum possible heat pump COP for a system operating between the two reservoirs?
What types of engineers (e.g. civil, construction, mechanical, industrial, material science, electrical, etc.) do you think need to be familiar with heat transfer? Why?
A mass of 12kg of refrigerant-134a initially exists as a saturated vapor in a piston-cylinder device at 240 kPa. Show the process on a P-v diagram with respect to saturation lines.
Air initially at rest (M1 = 0) with an initial pressure P1 = 1 atm and temperature T1= 300k flows through a nozzle into a partial vacuum with P2 = 0.2 atm. There is no elevation change. What is the
In Boulder Dam, 2000 cubic feet per second of water flows through each of the pipes (called penstocks) that lead down to the turbines. The penstocks are 30 feet in diameter, have a roughness of 1 in
What is the velocity of water at the nozzle outlet? Assume viscous effects are negligible and the elevation change between the nozzle inlet and outlet is negligible.
Calculate the speed of the flow at the nozzle exit and the force required to hold the nozzle stationary. Neglect weight.
The resonant speed is determined experimentally to be 1200 rpm and the corresponding amplitute of the main mass of the machine is 12.7 mm. Determine the amplitude for a speed of 2400 rpm.
If the pipe is placed in a 50 mi/hr crosswind (wind direction perpendicular to the axis of the cylinder), calculate the Reynolds number for the flow of air over the outside of the cylinder (using p
An inventor claims to have devised a power cycle exploiting this situation that has a thermal efficiency of 14%. Evaluate this claim.
The water pressure in the mains of a city at a particular location is 350kPa gage. Determine if this main can serve water to neighborhoods that are 50m above this location.
A large flywheel weighs 3000 kg and has a radius of gyration of 1 m. It is observed that 10 min is required for the flywheel to coast to rest from an angular velocity of 300 rad/s.
Oxygen gas enters a well-insulated diffuser at 30lbf/in^2, 440degree Rankine, with a velocity of 950 ft/s through a flow area of 2.0in^2. At the exit, the flow area is 15 times the inlet area, and t