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Kaylis [27]
3 years ago
15

A tennis ball is hit when it is 1.30 meters above the court. The ball's velocity leaving the racket is 8.08 m/s horizontally, ho

w far away does the ball land?
Physics
1 answer:
Greeley [361]3 years ago
5 0

Answer: 4.2 m

Explanation:

The time taken by the tennis ball to cover vertical displacement 1.30 m would be the same time in which ball would cover horizontal distance.

Initial velocity of the ball, u = 8.08 m/s in horizontal direction.

Initial velocity in the vertical direction is 0.

consider upward direction as positive and downward direction as negative. The ball free falls under gravity in the vertical direction.

Using the second equation of motion,

y = u t + 0.5 at²

⇒-1.30 m = 0 + 0.5 ×(-9.8m/s²) t²

⇒t = 0.52 s

There is no external force acting in the horizontal direction, thus horizontal distance covered is:

s =  u t ⇒ s = 8.08 m/s × 0.52 s = 4.2 m

Thus, the tennis ball lands 4.2 m far away.

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If your brakes fail, look for something to rub against, try to pick something that will not give way.True or False?
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Answer:

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Explanation:

False

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By driving zig-zag motion friction force on the tires may stop the car after some distance.

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7 0
3 years ago
Please help I'm dispirit.
Natasha_Volkova [10]

Synthesis and decomposition reactions are  b. Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form A + B → AB, while decomposition reactions are in the form AB → A + B.

Synthesis reactions are reactions in which elements or compounds combine to form a larger compound. They are of the form A + B → AB.

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Decomposition reactions are reactions in which a larger compound breaks up into smaller compounds or elements. They are of the form AB → A + B.

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Synthesis and decomposition reactions are opposite of each other since synthesis reactions, new substances are formed while in decomposition reactions the compound is broken down into into smaller constituents.

So, Synthesis and decomposition reactions are  b. Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form A + B → AB, while decomposition reactions are in the form AB → A + B.

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3 0
2 years ago
If a car takes a banked curve at less than a given speed, friction is needed to keep it from sliding toward the inside of the cu
zubka84 [21]

Answer:

minimum speed is 15.35 m/s

frictional coefficient  is 0.26

Explanation:

given data

radius = 84 m

angle = 16°

speed = 16 km/h = 4.43 m/s

to find out

minimum speed and   minimum coefficient

solution

we will apply here formula for velocity that is

velocity² = radius × g × tanθ

v² = 84 × 9.8 × tan16

v² =  236.04

v = 15.35 m/s

and

we find first friction force here

friction force 1 = m v² /r

friction force 1 = m (15.35)² / 84 = 2.80 m

and

friction force 2 = m v² /r

friction force 2 = m (4.43)² / 84 =  0.245 m

so total friction force = f1 - f2

total friction force = 2.80 - 0.245  = 2.55 m

so frictional coefficient = friction force /g

frictional coefficient = 2.55 / 9.8

so frictional coefficient  is 0.26

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3 years ago
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egoroff_w [7]

Answer:

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mass = force/acceleration

m = f/a

m = 7.5/15

m=0.5kg

3 0
3 years ago
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