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Xelga [282]
3 years ago
13

A traffic accident detective measures the skid marks left by a car, 825kg. He determines that the distance between the point tha

t the driver slammed on the brakes and the point where the car came to a stop was 34.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? (This car was not equipped with anti-lock brakes.
Physics
1 answer:
deff fn [24]3 years ago
7 0
Doing a force balance on the car:
ma = Fr
ma = μmg
a = μg
a = 0.3(9.81)
a = 29.43 m/s2

Using the formula:
2ax = v2
2(29.43)(34) = v2
v = 44.74 m/s = 161.05 km/h

The car was going 44.74 m/s or 161.05 kph when the brakes were applied.
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zaharov [31]

Answer:

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Explanation:

Newton's Third Law states that If an object X exerts a force on object Y, then object Y must exert a force of equal magnitude and opposite direction back on object X.

In other words, when force is applied from source A at B and in direction of B, B also simultaneously returns the force on B and in the direction of B.

This law applies when we jump off the ground when a rocket takes off from the earth into space, etc.

While standing, the body pushes on the earth with a force equal to its own weight. If the ground underneath the body does not meet that force in an equal and opposite direction,  both standing on the earth will fall into the earth, with the earth caving underneath it.

You can see why it is important to have a strong foundation for a building and why the depth and strength of the foundation will depend on how much weight is going on it.

Cheers!

3 0
3 years ago
Convert this number to standard notation: 1.4 x 10^-2*
Marysya12 [62]

Answer:

0.014

Explanation:

here

1.4 x 10^-2

=0.014

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6 0
3 years ago
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andrey2020 [161]

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3 0
3 years ago
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Furkat [3]
Hello.

The answer is harmful prescription.
<span>
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You are sitting 3 m away from you friend who is watching a cartoon on his phone. How will the sound itensity change if your frie
Zinaida [17]

Answer:

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Explanation:

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The intensity of energy is described by the inverse square law. It states that the intensity varies inversely with the distance square of the distance.

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In the context when the distance was 3 m, the intensity of the sound was = $\frac{1}{9}$

But when the distance became 6 cm or 0.06 m, the sound intensity decreases by =  $\frac{1}{0.06^2}$

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