For a bicycle, the nominal diameter of the outer race of a ball bearing and the inner surface of the hub is 62 mm. What should be the maximum dimension for the hub if a medium drive hole basis fit is desired? Use a preferred fit.

Compare the yearly greenhouse gas emissions from 1 GWe (gigawatt-electric) power stations powered by natural gas and wind turbines. The energy content of natural gas is 55 MJ/kg, and the electrical converting efficiency is 40%. Wind turbines do not emit CO₂ as they harness the wind but emissions do occur during the manufacturing of the turbine. For USA, assume the CO₂ emission per GDP is approximately 500 Tonnes / $ 1 million of GDP. For wind turbines, it costs $2 million for a 1 MWe plant, which has an efficiency of 0.3, and the yearly maintenance is approximately 2% of the initial cost. Assume the average lifetime of a wind turbine is 20 years.

For a bicycle, the nominal diameter of the outer race of a ball bearing and the inner surface of the hub is 62 mm. What should be the maximum dimension for the outer race of the ball bearing if a medium drive hole basis fit is desired? Use a preferred fit.

Air enters a compressor operating at steady state at 1.05 bar, 300 K, with a volumetric flow rate of 48 m³/min and exits at 12 bar, 400 K. Heat transfer occurs at a rate of 8 kW from the compressor to its surroundings.

Assuming the ideal gas model for air and neglecting kinetic and potential energy effects, determine the power input, in kW.

Problem 4.084 SI A rigid copper tank, initially containing 1.5 m3 of air at 295 K, 4 bar, is connected by a valve to a large supply line carrying air at 295 K, 15 bar. The valve is opened only as long as required to fill the tank with air to a pressure of 15 bar. Finally, the air in the tank is at 320 K. The copper tank, which has a mass of 20 kg, is at the same temperature as the air in the tank, initially and finally. The specific heat of the copper is c = 0.385 kJ/kg · K. Assuming ideal gas behavior for the air, determine: (a) the initial and final mass of air within the tank, each in kg, and (b) the heat transfer to the air and copper tank from the surroundings, in kJ, ignoring kinetic and potential energy effects.

What are the microstructural differences between thermoset s and vulcanized elastomers? Explain the different mechanical behavior of each.

I know I have to say something about "density of chemical bonding" but I am not quite sure what.

In a annealing there are different stages, can explain the stages and show in a plot the ductility overtime

discussion and conclusion for the thermal conductivity of solids Lab for the thermodynamics course

The value of f depends on two independent variables x and y as defined below:

f(x,y)=x2+y2−x+3cos(x)sin(y)

Function f has a minimum in the neighborhood of the origin (i.e. [0 0]). Find x and y which minimize f.

Note: You are not allowed to use MATLAB built-in functions for optimization. Follow the logic of the derivative test:

The minimum of f occurs where:

∂f∂x=0∂f∂y=0

At approximately what temperature (in Kelvin) would a specimen of an alloy have to be carburized for 2.6 h to produce the same diffusion result as at 880°C for 13 h? Assume that values for D₀ and Q_d are 1.3 × 10^-4 m²/s and 139 kJ/mol, respectively.

Q1. Explain the advantages and disadvantages of using the Zygo versus using the Mahr profilometer.

Q2.Would you use the Zygo or the Mahr in an industrial setting and why?

Two samples of a low hardness steel were tested using a Rockwell C hardness tester and the Rockwell B scale at the same lab on the same day . The difference between the average hardness of the two samples was 0.5 Rockwell C. Do you think there is a significant difference in the hardness? Justify your answer. Hint: Use the specification!!

Below is a model response solution. Rewrite this solution in one line using a correct notation that includes Heaviside functions.

x(t) = e?2t sin(3.46t) t < 3s

x(t) = e?2t sin(3.46t) + 0.2e?2(t?3) sin(3.46(t ? 3)) 3s ? t < 5s

x(t) = e?2t sin(3.46t) + 0.2e?2(t?3) sin(3.46(t ? 3))+1 + 1 e?2(t?5)cos(3.46(t?5)?0.52) t?5s 16 13.86

An austenitized 70 mm diameter 4340 steel bar is quenched in agitated H2O. Predict what the Rockwell C hardness of the bar will be at (a) its surface, (b) 3/4-R, (c) midway between its surface and center and (d) at its center

(a) S: _53_____                      (b) 3/4R: __52_____ (c) MR: __52_____      (d)

C: __51____

Please show work