An object is thrown with velocity v from the edge of a cliff above level ground. Neglect air resistance. In order for the object to travel a maximum horizontal distance from the cliff before hitting the ground, the throw should be at an angle θ with respect to the horizontal of:.
(A) greater than 60° above the horizontal
(B) greater than 45° but less than 60° above the horizontal
(C) greater than zero but less than 45° above the horizontal
(D) zero
(E) greater than zero but less than 45° below the horizontal

The correct option is;(C) greater than zero but less than 45° above the horizontal

Explanation:

Here, we have for maximum horizontal distance

h = v×t

Where t is the time of flight

The time of flight is given by

s = v·t - 0.5 × gt² to maximize the time of flight, we therefore increase the height such that

Since the range is given by

Horizontal range, x = v·t·cosα

Vertical range, y  = v·t·sinα - 0.5·g·t²

When the particle comes back to initial level, we have

0 = v·t·sinα - 0.5·g·t² → 0 = t(v·sinα - 0.5·g·t)

So that t = 0 or t =

Therefore, horizontal range =

Therefore maximum range is obtained when α = 45° as sin 90° = 1

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

what is the question?