Find the power needed to lift 25 lb. a distance of 15 feet in 20 seconds.

a. 18.75 foot-pounds per second

b. 8 foot-pounds per second

c. 12 foot-pounds per second

d. 33.3 foot-pounds per second

  18.75 ft·lb/s

Step-by-step explanation:

The units of power tell you how to do the calculation. Put the numbers together in a way that makes the units be units of power:

  (15 ft)·(25 lb)/(20 s) = (15·25/20) ft·lb/s = 18.75 ft·lb/s

This is the beautiful thing about physics. The units have to work out, or you did it wrong.

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)