During a reversible cycle the working agent receives from the hot source an amount of heat equal to 150 Kj. The temperature of the hot source is equal to 225 K, and that of the cold one is 145 K. Determine the amount of heat transmitted to the cold source.

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.