The bent rod ABCD rotates about a line joining points A and D with a constant angular velocity of 44 rad/s. Knowing that at the instant considered the velocity of corner C is upward, determine the velocity and acceleration of corner B.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.