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2 years ago

9

A car traveling along the highway needs a certain amount of force exerted on it to stop it in a certain distance. More stopping

force is required when the car has:.

1 answer:

galben [10]2 years ago

4 0

Answer:

Higher mass or higher speed

Explanation:

Higher mass will require more force

F= ma if m goes up F goes up to stop in the same distance

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Which of these are not mechanical waves and can be used to send a signal to astronauts on the moon?

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Radiowaves are electromagnetic waves and don't need a medium to travel through so B

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4 years ago

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Klio2033 [76]

Answer:

$m_{c} = 6768\,kg$

Explanation:

According to the Principle of Energy Conservation and the Work-Energy Theorem, the system is modelled as follows:

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Then,

$K_{f} = 0.78\cdot K_{o}$

$0.5\cdot (m_{f}+m_{c})\cdot v_{f}^{2} = 0.39\cdot m_{f}\cdot v_{o}^{2}$

Besides, the Principle of Momentum Conservation describes the following model:

$m_{f}\cdot v_{o} = (m_{f}+m_{c})\cdot v_{f}$

The final velocity of the system is:

$v_{f} = \frac{m_{f}}{m_{f}+m_{c}}\cdot v_{o}$

After substituting in the energy expression:

$0.5\cdot \frac{m_{f}^{2}}{m_{f}+m_{c}}\cdot v_{o}^{2} = 0.39\cdot m_{f}\cdot v_{o}^{2}$

$0.5\cdot m_{f} = 0.39\cdot (m_{f}+m_{c})$

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$0.39\cdot m_{c} = 0.11\cdot m_{f}$

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4 years ago

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I think that answer is D) Which heavenly body is casting the eclipse.
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3 years ago

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Answer:

$t=6.19s$

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3 years ago

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serg [7]

Answer

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