In fig. 4-41, a ball is thrown up onto a roof, landing 4.00 s later at height h 20.0 m above the release level. the ball’s path just before landing is angled at u 60.0° with the roof. (a) find the horizontal dis- tance d it travels. (see the hint to problem 39.) what are the (b) magnitude and (c) angle (relative to the horizontal) of the ball’s initial velocity?

"Fig is attacted with answer"

a) d = 33.72 m

b) = 26 m/s

c) β = 71.08°

Explanation:

a)

When an object is thrown into the air under the effect of the gravitational force, the movement of the projectile is observed. Then it can be considered as two separate motions, horizontal motion and vertical motion. Both motions are different, so that they can be handled independently.

Given data:

time = t = 4.00 s

Height = h = 20 m

Angle = θ = 60°

Horizontal distance = d = ?

Using 2nd  equation of motion

-20 = (4) + 0.5(-9.8)(4)²

(4) = 58.4

 = 14.6 m/s

This is vertical component of velocity when the ball is on the roof. To calculate the Final velocity and horizontal component, we use

= / sinθ

= 14.6 / sin 60

= 16.86 m/s

= cosθ

= 16.86 cos 60

= 8.43 m/s

To calculate the horizontal distance

d = t

d = (8.43)(4)

d = 33.72 m

b)

We know the values of Landing angle, height of roof, time of flight. In part a, We calculate the landing velocity of the ball and also its horizontal and vertical component. As the ball followed the projectile path, and we know that in projectile motion the horizontal component of the velocity remain constant throughout his motion. So there is no acceleration along horizontal path.

So,

=

but the vertical component of velocity vary with and there is an acceleration along vertical direction which is equal to gravitation acceleration g.

So,

g = ( - ) / t

9.8 =  14.6 - ) / 4

= 24.6 m/s

=

=

= 26 m/s

c)

cos β = /

β = cos⁻¹ (8.43 / 26)

β = 71.08°

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force