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alexandr402 [8]
3 years ago
13

If the velocity of a runner changes from -2 m/s to -4 m/s over a period of time, the

Physics
1 answer:
Mnenie [13.5K]3 years ago
3 0

Answer:

It will be A. So since its 2 times more the kinetic energy. But then you have to square it 2^2 = 4

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Answer:

6.25 s

Explanation:

V=u+at

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3 years ago
Copper has a specific heat of 0.09 cal/g x C . How much change in temperature would the addition of 8373 cal of heat have on a 5
neonofarm [45]
<h3>Answer:</h3>

172.92 °C

<h3>Explanation:</h3>

Concept being tested: Quantity of heat

We are given;

  • Specific heat capacity of copper as 0.09 cal/g°C
  • Quantity of heat is 8373 calories
  • Mass of copper sample as 538.0 g

We are required to calculate the change in temperature.

  • In this case we need to know that the amount of heat absorbed or gained by a substance is given by the product of mass, specific heat capacity and change in temperature.
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Therefore, to calculate the change in temperature, ΔT we rearrange the formula;

ΔT = Q ÷ mc

Thus;

ΔT = 8373 cal ÷ (538 g × 0.09 cal/g°C)

    = 172.92 °C

Therefore, the change in temperature will be 172.92 °C

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3 years ago
Nighttime is the result of
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Explanation:

Answer- D(Earth's spin)

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Which of the following is not an example of centripetal acceleration?
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An apple falling to the ground is not an example of centripetal acceleration.
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