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3 years ago

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A car was moving at 14 m/s After 30 s, its speed increased to 20 m/s. What was the acceleration during this time ( need help fas

t!!!)

1 answer:

Arada [10]3 years ago

7 0

Answer:let initial velocity u=14m/s

Final velocity v=20m/s

Time taken t=30

Acceleration =a

V=u +at

a= (20-14)/30

a=0.2m/s^2

Explanation:

Acceleration is the change in velocity with respect to time.

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A straight wire in a magnetic field experiences a force of 0.023 N when the current in the wire is 2.5 A. The current in the wir

Tatiana [17]

Answer:

The new current in the wire is 6.3 A.

Explanation:

Given that,

Force in a straight wire, F = 0.023 N

Current in the wire, I = 2.5 A

If new force is, F' = 0.058 N, we need to find the new current.

We know that, magnetic force is given by :

$F=ilB\sin\theta$

It is clear that force is directly proportional to electric current. So, we can say:

$\dfrac{F}{F'}=\dfrac{I}{I'}$

I' is new current

$I'=\dfrac{IF'}{F}\\\\I'=\dfrac{2.5\times 0.058}{0.023}\\\\I'=6.3\ A$

So, the new current in the wire is 6.3 A. Hence, this is the required solution.

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3 years ago

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TiliK225 [7]

Answer:

The applied force is greater than the frictional force.

Explanation:

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if there is no friction then the chair <u>would accelerate and it would not be at a constant speed</u><u>.</u>

hence, the only possible answer is B.

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3 years ago

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4 years ago

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Burka [1]

Answer:

no

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3 years ago

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