(a) calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 28.6 m. assume the density of the water is 1.00 ✕ 103 kg/m3 and the air above is at a pressure of 101.3 kpa. (b) what force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 30.0 cm?

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

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

see earlier answer

we need to know the time interval during which the force acts. impulse of force = momentum change