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3 years ago

Find the magnitude of the sum

Physics

1 answer:

Hunter-Best [27]3 years ago

7 0

Answer:

8.57 m

Explanation:

To solve the problem, we have to decompose the two vectors along the two directions first:

Vector A:

- x component: Ax = +9.66 m

- y compoment: Ay = 0 (the vector lies along the x-axis)

Vector B:

- x component: $B_x = -(12.0 m) cos 45^{\circ}=-8.49 m$

- y component: $B_y = (12.0 m) sin 45^{\circ}=8.49 m$

So now we can find the sum of the two vectors by adding the components along each axis:

$R_x = A_x + B_x = 9.66 m - 8.49 m = 1.17 m$

$R_y = A_y + B_y = 0 + 8.49 m = 8.49 m$

And the magnitude of the sum is given by Pythagorean theorem:

$R=\sqrt{R_x^2+R_y^2}=\sqrt{(1.17 m)^2+(8.49 m)^2}=8.57 m$

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3 years ago

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lorasvet [3.4K]

Answer:

a An increase in the speed will lower the internal pressure

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3 years ago

after a large snowstorm you shovel 2000 kilograms of snow off your side walk in 1 hour. you lift the shovel to an average height

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Lifting a mass to a height, you give it gravitational potential energy of

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To give it that much energy, that's how much work you do on it.

If 2,000 kg gets lifted to 1.25 meters off the ground, its potential energy is

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If you do it in 1 hour (3,600 seconds), then the average power is

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None of these figures depends on whether the load gets lifted all at once,
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But this certainly is NOT all the work you do. When you get a shovelful
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it doesn't just float there. You typically toss it, away from where it was laying
and over onto a pile in a place where you don't care if there's a pile of snow
there. In order to toss it, you give it some kinetic energy, so that it'll continue
to sail over to the pile when it leaves the shovel. All of that kinetic energy
must also come from work that you do ... nobody else is going to take it
from you and toss it onto the pile.

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3 years ago

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natali 33 [55]

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