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Eduardwww [97]
3 years ago
15

A box is pushed 40 m by a mover. The amount of work done was 2,240 j. How much force was exerted on the box

Physics
1 answer:
Georgia [21]3 years ago
3 0

The force exerted on the box is 56 N

Explanation:

The work done by a force on an object is given by

W=Fd cos \theta

where

F is the magnitude of the force

d is the displacement of the object

\theta is the angle between the direction of the force and of the displacement

For the box in this problem, we have:

W = 2240 J is the work done

d = 40 m is the displacement of the box

Assuming that the  force is parallel to the displacement, \theta=0

Solving the equation for F, we find the force exerted on the box:

F=\frac{W}{d cos \theta}=\frac{2240}{(40)(cos 0)}=56 N

Learn more about work:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

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A small sphere is at rest at the top of a frictionless semicylindrical surface. The sphere is given a slight nudge to the right
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Answer:

vi = 4.77 ft/s

Explanation:

Given:

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- The Angle at which the the sphere leaves

- Initial velocity vi

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Determine the sphere's initial speed.

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                         m*g*cos(θ) - N = m*v^2 / R

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                         m*g*cos(θ) - 0 = m*vf^2 / R

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                          ΔK.E = ΔP.E

                          0.5*m* ( vf^2 - vi^2 ) = m*g*(R - R*cos(θ))

                          ( vf^2 - vi^2 ) = 2*g*R*( 1 - cos(θ))

                          vi^2 =  vf^2 - 2*g*R*( 1 - cos(θ))

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Explanation:

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