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Sonbull [250]
2 years ago
5

Which are descriptions of gravity on Earth? Check all that apply.

Physics
2 answers:
vlada-n [284]2 years ago
7 0
Gravitational force is a NON-CONTACT FORCE. Gravitational force acts on all bodies on the earth that have mass. The force which is exerted through weight acts on the center of gravity of the body. The force is directed towards the center of the earth. The weight of a body is the gravitational force exerted by the earth on the body.
nataly862011 [7]2 years ago
4 0

an attractive force

a noncontact force

a vertical force

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1. If the angle of the ramp were increased from 30˙ to 45˙, how would this change the weight of the box? Explain.
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When the angle of the ramp increases, the weight of the box acting perpendicular to the ramp decreases.

<h3>Normal reaction of the box</h3>

The normal reaction of the box is due to weight of the box acting perpendicular to the ramp.

Fn = Wcosθ

<h3>when the angle of the ramp = 30⁰</h3>

Fn = Wcos(30)

Fn = 0.866W

<h3>when the angle of the ramp = 45⁰</h3>

Fn = W x cos(45)

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Thus, when the angle of the ramp increases, the weight of the box acting perpendicular to the ramp decreases.

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2 years ago
A thermos bottle has two layers, a glass layer and a vacuum layer.
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The vacuum layer is the better thermal insulator

Explanation:

Depending on how they conduct heat, materials can be classified into two types:

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In this sense, vacuum is the best possible insulator. This is because vacuum contains no particles at all, so there cannot be transfer of heat by conduction (because there cannot be collisions between molecules), and therefore, vacuum is the best thermal insulator.

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Answer: D

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Frank’s Furniture trains all of its employees to use computers is an example of an improvement in human capital.

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