Explain how to calculate step by step
1 answer:
Answer:
The kinetic friction coefficient is 0.436
Explanation:
In the attached image we can find a sketch of the forces that are acting over the box. And using the second law of movement of Newton we can find two equations which give us the relation between the friction force and the normal force.
The third equation is deducted by the definition of the friction force:
Then replacing the equation 1 (see image) in the equation 2 we will have the final equation. Then we can clear the value of u (kinetic coeficcient).
The answer is 0.436 and this value is between 0 - 1.
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The mass of the car should be A) 1212 kg
Explanation:
We can solve the problem by using Newton's second law of motion, which states that
where:
F is the force produced by the engine
m is the mass of the car
a is its acceleration
In the first situation we have
m = 1515 kg
is the acceleration
Solving for F, we find the force produced by the engine:
Now we want the car to reach an acceleration of
Using the same engine, therefore the force produced is still
F = 18,180 N
Re-arranging the equation for m', we find what should be the new mass of the car:
Learn more about Newton's second law:
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