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lilavasa [31]
3 years ago
12

A ball drops some distance and gains 30 J of kinetic energy. How much gravitational potential energy did the ball start with? Do

not ignore the effects of air resistance.
Physics
1 answer:
Dovator [93]3 years ago
4 0

Answer:

The gravitational potential energy of the ball is more than 30 J.

Explanation:

Given that,

Gains kinetic energy = 30 J

We need to calculate the gravitational potential energy

According to law of conservation of energy

If there is no air resistance then the potential energy of the ball fully converted into kinetic energy.

If the air resistance is considered then the potential energy used to do work against air resistance.

\Delta U\geq \Delta K.E

According to question,

A ball drops some distance and gains 30 J of kinetic energy and considers air resistance then 30 J of potential energy can be loosed by the ball.

Hence, The gravitational potential energy of the ball is more than 30 J.

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antiseptic1488 [7]

Answer:The mass of ball B is 10 kg.

Explanation;

Mass of ball A = M_A=5 kg

Velocity of the ball A before collision:U_A=20 m/s

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Mass of ball B= M_B

Velocity of the ball B before collision:U_B=10 m/s

Velocity of ball B after collision=V_B=15 m/s

M_AV_A+M_BV_B=M_AU_A+M_BU_B

5 kg\times 10 m/s+M_B\times 15=5 kg\times 20m/s+M_B\times 10m/s

M_B=10kg

The mass of ball B is 10 kg.

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3 years ago
The electric field in a region of space increases from 0 0 to 3450 N/C 3450 N/C in 4.40 s. 4.40 s. What is the magnitude of the
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Answer: B = 1380T

Explanation: please find the attached file for the solution

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3 years ago
Find the object's speeds v1, v2, and v3 at times t1=2.0s, t2=4.0s, and t3=13s.
Burka [1]
Since this is a distance/time graph, the speed at any time is the slope
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At time  t1 = 2.0 s
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Its slope is  7/3 .              v1 = 7/3 m/s .

At time  t2 = 4.0 s
That's in the middle of the horizontal part of the graph
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Its slope is zero.
                                     v2 = zero .

At time  t3 = 13 s.
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7 0
3 years ago
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A running back with a mass of 70 kg travels down the field with a velocity of 5.0 m s . Calculate the kinetic energy of the foot
jarptica [38.1K]

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4 years ago
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Suppose that you are holding a pencil balanced on its point. If you release the pencil and it begins to fall, what will be the a
Naily [24]

Answer:

The angular acceleration of the pencil<em> α  = 17 rad·s⁻²</em>

Explanation:

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The weight is that the pencil has is,

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Thus,

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Therefore, the angular acceleration of the pencil<em> </em>is<em> 17 rad·s⁻²</em>

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