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Pachacha [2.7K]
3 years ago
5

What type of device is a car engine?

Physics
1 answer:
rusak2 [61]3 years ago
7 0

heat engine that uses work to move heat

mark brainliest  :)

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Two students are standing on a fire escape, one twice as high as the other. Simultaneously, each drops a ball.
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MariettaO [177]

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A 1300 kg car moving at 20 m/s and a 900 kg car moving at 15 m/s in precisely oppositedirections participate in a head-on crash.
miskamm [114]

Given

Car 1

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v1 = 20 m/s

m2 = 900 kg

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(Negative sign shows that direction of car 2 is opposite to car 1)

Procedure

As per the conservation of linear momentum, "The total momentum of the system before the collision must be equal to the total momentum after the collision". And this applies to the perfectly inelastic collision as well. Then the expression is,

\begin{gathered} m_1v_1+m_2v_2=(m_1+m_2)v \\ v=\frac{m_1v_1+m_2v_2}{m_1+m_2} \\ v=\frac{1300\operatorname{kg}\cdot20m/s-900\operatorname{kg}\cdot15m/s}{1300\operatorname{kg}+900\operatorname{kg}} \\ v=5.681m/s \end{gathered}

Thus, we can conclude that the speed and direction of the cars after the impact is 5.68 m/s towards the first car.

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Explanation:

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