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Lady_Fox [76]
3 years ago
7

A soccer ball is kicked horizontally off a 24.0 meter high hill and lands a distance of 33.0 meters from the edge of the hill. D

etermine the initial horizontal velocity of the soccer ball.
Physics
2 answers:
ryzh [129]3 years ago
8 0

Answer:

Question:

A soccer ball is kicked horizontally off a  

22.0

meter high hill and lands a distance of  

35.0

meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball.

Projectile:

The projectile motion is a combination of uniform motion and uniform acceleration motion. When an object is thrown with a velocity (v) then, the horizontal component of the velocity (

v

h

) does not change with respect to time and therefore, the following relation holds valid for the horizontal motion:

S

p

e

e

d

=

S

p

e

e

d

T

i

m

e

The vertical component of the velocity (

v

v

) changes at the rate of  

g

=

9.81

 

m

/

s

2

and therefore, the equations of motion are used to study the vertical motion of the object. These equations are customized for the vertical motion as:

v

=

u

+

g

t

s

=

u

t

+

0.5

g

t

2

v

2

−

u

2

=

2

g

s

For an object thrown with a horizontal velocity, the initial vertical component of the velocity will be zero. In that case, the vertical distance traveled by the object in time (t) will be,

s

=

0.5

g

t

2

⇒

t

=

√

2

s

g

Answer and Explanation:

Given:

Height of the hill,  

H

=

22

 

m

The horizontal distance covered by the ball before it lands,  

d

=

35

 

m

Calculating the time taken by the ball to hit the ground,

t

=

√

2

H

g

=

√

2

(

22

)

9.81

=

2.12

 

s

Calculating the initial horizontal velocity of the ball,

V

=

d

t

=

35

2.12

=

16.51

 

m

/

s

which is the answer.

Explanation:

vekshin13 years ago
6 0

Answer:

ten minutes fakfdxjjnox

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DIA [1.3K]

Answer:

The electromagnetic force

Explanation:

There are four fundamental forces in nature:

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3 years ago
A hockey puck is hit on a frozen lake and starts moving with a speed of 13.60 m/s. Exactly 6.2 s later, its speed is 7.20 m/s. (
stellarik [79]

Answer:

-1.03 m/s²

Explanation:

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Mathematically, acceleration is expressed as

a = (v-u)/t ........................ Equation 1

Where a = acceleration, v = final velocity, u = initial velocity, t  = time.

Given: u = 13.60 m/s, v = 7.20 m/s t = 6.2 s.

Substituting into equation 2

a = (7.20-13.60)/6.2

a = -6.4/6.2

a = -1.03 m/s²

Note: a is negative because, the hockey puck is decelerating.

Hence the average acceleration = -1.03 m/s²

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denpristay [2]
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E=U+K
where U is the gravitational potential energy and K the kinetic energy.

Initially, the kinetic energy is zero (because the rock starts from rest, so its speed is zero), and the total mechanical energy of the rock is just gravitational potential energy. This is equal to
E_i=U=mgh
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Putting the numbers in, we find the potential energy
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2) Just before hitting the ground, the potential energy U is zero (because now h=0), and all the potential energy of the rock converted into kinetic energy, which is equal to:
E_f=K= \frac{1}{2}mv^2
where v is the speed of the rock just before hitting the ground. Since the mechanical energy of the rock must be conserved, then the kinetic energy K before hitting the ground must be equal to the initial potential energy U of the rock:
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W=196.2 J-0 J=196.2 J
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