Daniel would like to test a composite insulation he has made. He uses a heat box that will heat 7 kg of air. The specific heat of air is 1000 J/kgC. He records the temperature inside the box at the start to be 58C, the box heats to maximum temperature to be 99C, and then cools to a final temperature of 73C. Determine the energy gained by the air in the box during heating – Q(heat) in J (Joules).

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

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.