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Pavel [41]
3 years ago
10

Bradley is standing on the top of a mountain holding a soccer ball. Which of these best describes what happens when he throws th

e ball over the edge?
A)
The kinetic energy increases and so does the total amount of energy.


B)
The kinetic energy decreases and the total amount of energy increases.


C)
The potential energy decreases and the total amount of energy also decreases.


D)
Both the kinetic and potential energy change, but the total energy remains constant.
Physics
1 answer:
Simora [160]3 years ago
7 0
Which one was it, please tell me :( :)
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Please help me solve this and give an explanation​
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Answer:

6.5

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2 years ago
A 5-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops.
densk [106]

To solve this problem it is necessary to apply the concepts related to the Kinetic Energy and the Energy Produced by the heat loss. In mathematical terms kinetic energy can be described as:

KE = \frac{1}{2} mv^2

Where,

m = Mass

v = Velocity

Replacing we have that the Total Kinetic Energy is

KE = \frac{1}{2} mv^2

KE = \frac{1}{2} (5*10^{-3})(300)^2

KE =  225J

On the other hand the required Energy to heat up t melting point is

Q_1 = mC_p \Delta T

Q_2 = L_f m

Where,

m = Mass

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\Delta T =Change at temperature

L_f = Latent heat of fussion

Heat required to heat up to melting point,

Q = Q_1+Q_2

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The energy required to melt is larger than the kinetic energy. Therefore the heat of fusion of lead would be 327 ° C: The melting point of lead.

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