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3 years ago

On a horizontal axis whose unit is the meter, a linear load ranging from 0 to 1 ma a linear load distribution = 2 nC / m.

Physics

1 answer:

Dimas [21]3 years ago

6 0

Answer:

The correct answer is - 8.99N/C

Explanation:

$dE=k\dfrac{dq}{x^2}\\ dq=\lambda{dx}\\ \lambda=2nC/m\\ dq=2dxnC\\ dE=k\dfrac{2dx}{x^2}\\ E=2k\int_1^2\dfrac{dx}{x^2}\\ E=2k(\frac{-1}{x})_1^2=k\times10^{-9}N/C\\ E=8.99\times10^9\times10^{-9}N/C\\ E=8.99N/C\\dE=k$

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What is the velocity of a ball dropped from a height of 150 m when it hits the ground? Take the upward direction as positive.

djyliett [7]

Answer:

The velocity of the ball when its hit the ground will be 54.22 m/sec

Explanation:

We have given height from which ball is dropped h = 150 m

Acceleration due to gravity $g=9.8m/sec^2$

As the ball is dropped so initial velocity will be zero so u = 0 m/sec

According to third equation of motion we know that $v^2=u^2+2gh$

$v^2=0^2+2\times 9.8\times 150$

$v=54.22m/sec$

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vampirchik [111]

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Explanation:

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3 years ago

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Read 2 more answers

Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rota

rjkz [21]

Answer:

At t=T/2 the angular speed equals to its average angular speed

Explanation:

Angular Motion

Let w be the angular speed of a rotating object, $\alpha$ its angular acceleration, and T the time the acceleration is acting upon the object. The basic formula for the angular motion is

$w=w_o+\alpha t$

We are told the initial speed is zero, so

$w=\alpha t$

The average angular speed from t=0 to t=T can be found by

$\displaystyle \bar w=\frac{1}{T}\int_0^T{w.dt}$

$\displaystyle \bar w=\frac{1}{T}\int_0^T{\alpha t.dt}$

$\displaystyle \bar w=\frac{1}{T}\frac{\alpha T^2}{2}$

$\displaystyle \bar w=\frac{\alpha T}{2}$

This value is reached at a certain time we need to compute, knowing that

$w=\bar w$

Or equivalently

$\displaystyle \alpha t=\frac{\alpha T}{2}$

Simplifying we have

$\displaystyle t=\frac{T}{2}$

At t=T/2 the angular speed equals to its average angular speed

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3 years ago

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storchak [24]

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