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3 years ago

Which body exerts the force that propels the sprinter, the blocks or the sprinter?

1 answer:

5 0

Answer: The blocks

Explanation:
When the sprinter takes off, he/she presses hard on the block.
The blocks apply an equal and opposite force to the sprinter according to Newton's 3rd law of motion.
The reaction force from the blocks gives the sprinter the initial acceleration to begin the race.

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What two pieces of information do you need to know to get from one location to another?

Tresset [83]

That two information would be "Velocity" & "Time"

We Know = Displacement = Velocity * Time

Hope this helps!

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4 years ago

Determine the number of protons for K-40

inna [77]

I think there is 19 protons

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3 years ago

find the work done in moving an object along a vector r = 3i + 2j - 5k if applied force is F = 2i - j -k

rosijanka [135]

We need to know the distance ... how far the force
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4 years ago

(1 point) An object with weight W is dragged along a horizontal plane by a force acting along a rope attached to the object. If

ValentinkaMS [17]

Answer:

$\frac{27(sin t - 0.6 cost)}{(0.6 sint +cost)^2}$

Explanation:

From the text of the complete problem found on internet, the expression of the force is:

$F=\frac{\mu W}{\mu sin t + cos t}$

The rate of change of F with respect to t can be find by calculating the derivative of F with respect to t.

First of all, let's recall the derivative of sine and cosine:

$\frac{d}{dt} sin t = cos t\\\frac{d}{dt} cos t = - sin t$

We have to calculate the derivative of a composite function, of the form

$\frac{k}{g(f(x))}$

Its derivative is given by

$-\frac{k}{g^2(f(x))} f'(x)$

By applying this formula to our expression, we find:

$F'=-\frac{\mu W}{(\mu sin t + cos t)^2} (\mu cos t - sin t) = \frac{\mu W(sin t - \mu cost)}{(\mu sint +cost)^2}$

And by substituting the given data:

W = 45 lb

$\mu = 0.6$

we find:

$\frac{27(sin t -0.6 cost)}{(0.6 sint +cost)^2}$

7 0

3 years ago

Transverse and longitudinal waves both

Anettt [7]

<h3><u>Answer</u>; </h3>

They both transfer energy through a medium in form of waves.

<h3><u>Explanation</u>;</h3>

Transverse waves are waves in which the waves move in perpendicular direction to the source of vibration of particles. For longitudinal waves, the waves move in parallel direction to the source of vibration.
<em><u>They are similar in the sense that energy is transferred in the form of waves. Therefore, they are common in that they both transfer energy through a medium.</u></em>

3 0

4 years ago