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Alinara [238K]
3 years ago
15

A car travels a distance of 74 meters in 7 seconds. What is the average speed of the car?

Physics
1 answer:
Nuetrik [128]3 years ago
4 0

Answer:

<h2>10.57 m/s</h2>

Explanation:

The average speed of the car can be found by using the formula

s =  \frac{d}{t }  \\

d is the distance

t is the time taken

From the question we have

s =  \frac{74}{7}   \\  = 10.571428...

We have the final answer as

<h3>10.57 m/s</h3>

Hope this helps you

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18750 kg-m/s

Explanation:

Momentum = mass x velocity 

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The heat flux that is applied to the left face of a plane wall is q" = 20 w/m2. the wall is of thickness l = 10 mm and of therma
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The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.32 with the floor. If t
coldgirl [10]

Answer:

The shortest braking distance is 35.8 m

Explanation:

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     N = W = mg

  X axis

     -Fr = m a

     -μ N = m a

     -μ mg = ma

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     a  = - 0.32 9.8

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We calculate the distance using the kinematics equations

    Vf² = Vo² + 2 a x

     x = (Vf² - Vo²) / 2 a

When the train stops the speed is zero (Vf = 0)

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     x = ( 0 - 15²) / 2 (-3.14)

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7 0
3 years ago
An ice boat is coasting along a frozen lake. Friction between the ice and the boat is negligible, and so is air resistance. Noth
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(A) No

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(A) since there is nothing propelling the boat and the friction between the ice and the boat and also air resistance is negligible the net force of the system in the horizontal direction is zero and hence there is no change in the horizontal momentum of the boat.

(B) Since the person had not velocity in the horizontal direction before landing on the boat but now has one after landing on the boat, the speed of the boat will decrease because the momentum has to be conserved (remember there is no change in it).

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Answer:

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