Which of these best dscribes earth's mantle? a. most dense layer, consists of the outer and inner parts b. thinnest under the oceans and thickest under continents c. middle layer, density increases with depth as pressure increases d. least dense layer overall, consists of two layers of different thickness

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.

the answer is a. hope this .