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aalyn [17]
3 years ago
8

A ball is dropped from the roof of a building. the mass of the ball is 3.0 kg. what is the potential energy of the ball in the i

nstant that it is exactly 18.0 meters above the ground?
Physics
1 answer:
vitfil [10]3 years ago
6 0
According to given condition there is no height(m) given from roof of building to the ground, there height given 18 m at a point above the ground.                         So, h=18m  ,                mass=3kg     ,         g=9.8m/s2                                                                      P.E=mgh                                                                                                                P.E=(3)(9.8)(18)                                                                                                      P.E=529J
                                      
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Answer:

The answer to the question is

4433.416 kJ

See explanation below

(3-y)²+r² = 3² or

6y-y² = r²

r =√(6y-y²)

The volume of a small section of height Δy =  Δy ×(√(6y-y²))²×π

For water with density of 1000 kg/m³, the mass of the slice

= 1000×Δy ×(√(6y-y²))²×π and since force = mass × acceleration we have

1000×Δy ×(√(6y-y²))²×π ×g = 1000×Δy ×(√(6y-y²))²×π ×9.81

The work done to move a unit height of y+1 = Force × Distance

W  = 1000×Δy ×(√(6y-y²))²×π ×9.81 × (y+1)

Integrating the entire section of the sphere that is 2×r high, or from 0 to 6 we get

W =\int\limits^6_0 {1000*(6y-y^{2} ) *\pi *9.81 * (y+1)} \, dy

= 9810*\pi \int\limits^6_0 {5y^{2} -y^{3}  +6y \, dy

= 9810*\pi *[\frac{5y^{3} }{3} -\frac{y^{4} }{4} +3y^{2} ]^{6} _{0}

=9810×π×144 =4433416 J

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3 years ago
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Aleksandr [31]

Answer:

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alexira [117]

Answer:

A

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The formula of kinetic energy is 1/2mv^2

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As mass increases , kinetic energy increase .

So option b , the first rider had more mass is correct z
5 0
2 years ago
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Answer: A and B

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The statement above shows that EM radiations possesses different wavelengths and frequency.

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