In order to test the thermal insulation of a given material, you build a hollow cube of 25.0 cm of its ring using 1.5 cm thick laminas. You put a thermometer and a 100 W heater inside the box. Once the balance ˆ has been reached temperature inside the box and 90 °C and while the outside temperature is 25 °C °C. Determine the resistance of the box.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

Fluids at rest possess no flow energy. a)- true b)- false

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.