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3 years ago

Calculate the kinetic energy of a 1000 kg car traveling at 30 m/s, a typical speed on a highway.

Physics

1 answer:

Arte-miy333 [17]3 years ago

7 0

The kinetic energy of the car is $4.5\cdot 10^5 J$

Explanation:

The kinetic energy of an object is the energy possessed by the object due its motion. It is given by

$E_k = \frac{1}{2}mv^2$

where

m is the mass of the object

v is its speed

For the car in this problem, we have:

m = 1000 kg is its mass

v = 30 m/s is its speed

Substituting into the equation, we find the kinetic energy of the car:

$E_k = \frac{1}{2}(1000)(30)^2=4.5\cdot 10^5 J$

Learn more about kinetic energy:

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A proton and an alpha particle are momentarily at rest at adistance r from each other. They then begin to move apart.Find the sp

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Answer:

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Explanation:

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We can solve this problem using conservation of energy and momentum.

Since both particles are at rest at the beginning, the initial energy and momentum are:

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where k is the coulomb constant (= 8.987×10⁹ N·m²/C²)

and q1 = e and q2 = 2e

When the distance between the particles doubles, the energy and momentum are:

Ef = k (q1q2)/2r + (1/2)m1v1^2 + (1/2)m2v2^2

pf = m1v1 + m2v2

with m1 = m, m2 = 4m, v1=vf_p, v2 = vf_alpha

The conservation momentum states that:

pi = pf

Therefore:

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That is:

v2 = (1/4) v1

The conservation of energy states that:

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Replacing

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