Motor 1 is producing 22 hp at 3450 rpm. torque loads of 57ft⋅lb57ft⋅lb, 179ft⋅lb179ft⋅lb, and 67ft⋅lb67ft⋅lb are being driven at a, c, and d, respectively. the dimensions of shaft abcde (which has concentric solid circular cross-sections and a modulus of rigidity of 10.3 mpsi) are given below. assuming no losses in the system, find: (i) the torque, power, and angular velocity being produced by motor 2. (ii) the maximum torsional stresses and the angles of twist in each segment of shaft abcde (iii) the overall maximum torsional shear stress and the overall angle of twist between a and e.

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only

A Carnot heat engine receives heat from a reservoir at 900$^\circ{}$C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27$^\circ{}$C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5$^\circ{}$C and transfers it to the same ambient air at 27$^\circ{}$C. Determine (a) the maximum rate of heat removal from the refrigerated space and (b) the total rate of heat rejection to the ambient air. Answers: (a) 4982 kJ/min, (b) 5782 kJ/min