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1 year ago

A tennis ball is hit into the air with a racket. when is the ball’s kinetic energy the greatest? ignore air resistance.

Physics

1 answer:

krok68 [10]1 year ago

4 0

When the player strikes the ball, kinetic energy is at its greatest.

Kinetic energy = 1/2*m* $v^{2}$

where m denotes mass and v denotes velocity.

Therefore, kinetic energy is inversely correlated with square of velocity.

When a player strikes the ball, velocity is at its highest.

Thus, when the player strikes the ball, kinetic energy is at its highest.

<h3>What is kinetic energy?</h3>

It is the energy that a body has because it is moving.

<h3>Which 5 forms of kinetic energy are there?</h3>

Kinetic energy comes in five different forms:

radiant
thermal
sound
electrical
mechanical.

Kinetic energy is measured in Joules.

Importance of kinetic energy:

The capacity to perform work is kinetic energy's most significant quality.
Force acting on an object while it is moving is referred to as work.
Energy and work are interchangeable because of their tight relationship.

To learn more about kinetic energy visit:

brainly.com/question/12669551

#SPJ4

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3 years ago

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Marrrta [24]

Answer:

D. 12.4 m

Explanation:

Given that,

The initial velocity of the ball, u = 18 m/s

The angle at which the ball is projected, θ = 60°

The maximum height of the ball is given by the formula

h = u² sin²θ/2g m

Where,

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Substituting the values in the above equation

h = 18² · sin²60 / 2 x 9.8

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3 years ago

You have probably noticed that carrying a person in a pool of water is much easier than carrying a person through air. To unders

Kruka [31]

Answer:

The answer is "0.91238 and 744.8"

Explanation:

In this scenario it is easier to take a person to the water-pool than to transport the people in the air, as the person's strength is increased by water upwards:

$f_b \to m \to mg =person \\\\F_B \ in\ air = v\ & air\ g \\\\$

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6 0

3 years ago

Which of the following is true about a planet orbiting a star in uniform circular

Mnenie [13.5K]

The velocity vector of the planet points toward the center of the circle is the following is true about a planet orbiting a star in uniform circular motion.

A. The velocity vector of the planet points toward the center of the circle.

<u>Explanation:</u>

Motion of the planet around the star is mentioned to be uniform and around a circular path. Objects in uniform circular motion motion has constant angular speed but the velocity of the object will not remain constant. Since the planet is in circular motion the direction of velocity vector at a particular point is tangential to the circular path at that particular point.

Thus at every point, the direction of velocity vector changes and this means the velocity is never constant. The objects in uniform circular motion has centripetal acceleration which means that velocity vector of the planet points toward the center of the circle.

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3 years ago

If you push a crate across a factory floor at constant speed in a constant direction, what is the magnitude of the force of fric

poizon [28]

Answer:

The magnitude of the force of friction equals the magnitude of my push

Explanation:

Since the crate moves at a constant speed, there is no net acceleration and thus, my push is balanced by the frictional force on the crate. So, the magnitude of the force of friction equals the magnitude of my push.

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Thus, F = f

So, the magnitude of the force of friction equals the magnitude of my push.

3 0

3 years ago