In a physics lab, a 60-kg student runs up a 2.0-meter tall flight of stairs in 1.5 seconds. the work done to get to the top is 1200 joules. the student's power rating is approximately _w.

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?

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

What causes the formation of ocean currents?