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Marrrta [24]
3 years ago
11

Iva is studying whether students gain weight during their first year of college. she collects weights from all the incoming fres

hmen in the fall, then collects weights from them again at the end of the spring term. what is the term for the correlation she finds when she compares the fall and spring weights of the students?
Physics
1 answer:
atroni [7]3 years ago
8 0
The term for the correlation she finds when she compares the fall and spring weights of the students is a<span>utocorrelations.  This is because this is a correlation of one variable with itself, measured on two different occasions, both the spring and the fall.</span>
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To push a 26.0 kg crate up a frictionless incline, angled at 25.0° to the horizontal, a worker exerts a force of 209 N parallel
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Answer:

(a) W = +397.1 J

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Explanation:

Work (W) is defined as the product of force (F) by the distance (d)the body travels due to this force. :

W= F*d Formula ( 1)

The forces that perform work on an object must be parallel to its displacement.

The forces perpendicular to the displacement of an object do not perform work on it.

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The work is negative (W-) if the force has the opposite direction of the movement of the object.

Problem development

(a) Work performed by the worker's applied force on the box .

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(b) Work performed by the gravitational force on the crate

We calculate the weight component parallel to the displacement of the box:

We define the x-axis in the direction of the inclined plane ,25.0° to the horizontal.

We define the y-axis and in the direction of the plane perpendicular to the inclined plane.

W= m*g=26*9.8= 254.8N : total box weight

Wx= W*sen25.0°= 254.8*sen25.0°= 107.68 N

W = -Wx *d =107.68 N *1.9 m= -204.6 J

(c) Work performed by normal force (N) exerted by the incline on the crate

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W=0

(d) Total work done on the crate

W = 397.1 J -204.6 J

W = 192.5 J

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