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Murrr4er [49]
2 years ago
9

Which option do you think could cause near sightedness?

Physics
2 answers:
Softa [21]2 years ago
7 0

Answer:A

Explanation:because it doesn’t refract light so you can’t see close

Travka [436]2 years ago
6 0

Answer:

A) the eye lens doesn't refract light

Explanation: because the eye doesn’t refract, or bend, light properly to focus on the retina. Makes eyesight appear blurry and distorted.

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How much work does it take to lift 345 boxes to a height of 6.00 m of each box has a mass of 7.89 kg
Art [367]

Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.

<h3>Work done</h3>

Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;

W = F × d

Where F is force applied or Weight and d is distance

Also Force = Weight = mass × acceleration due to gravity.

Since gravity is acting on the boxes as it been lift

W = Weight × height from ground level

W = mg × d

Where m is mass of the boxes, g is accelration due to gravity( g = 9.8m/s² ) and d is distance from ground level.

Given the data in the question;

  • Since each box has a mass of 7.89 kg
  • Mass of the 345 boxes = 345 × 7.89 kg = 2722.05kg
  • Distance or height d = 6.0m
  • Work done W = ?

To determine the work done, we substitute our values into the expression above.

W = mg × d

W = 2722.05kg × 9.8m/s² × 6.0m

W = 160056.5kgm²/s²

W = 160056.5J

W = 1.6 × 10⁵J

Therefore,  Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.

Learn more about work done here: brainly.com/question/26115962

3 0
3 years ago
What's the value of 1,152 Btu in joules?
Law Incorporation [45]

this is how to convert BTU (IT) to Joules:

1 BTUIT = 1055.05585262 J

 

So the energy conversion from BTU to joules is given by the formula:

E(J) = 1055.05585262 ⋅ E(BTU)

BUT HERE IS THE ANSWER TO YOUR QUESTION 

1215424.3422
3 0
3 years ago
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