9. carlos jumps out of a hovering helicopter. after he opens his parachute, his acceleration due to gravity decreases
to zero. this is because
a the force of air resistance becomes equal in magnitude to his weight.
b. the force of gravity has become zero.
c. air resistance must be zero
d. he must have struck the ground,

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?

Write the correct abbreviation for each metric unit

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat