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3 years ago

If you are looking straight ahead an object that is behind you is in your cone of vision.

Physics

2 answers:

Dimas [21]3 years ago

5 0

False
You cannot see behind you, therefore it is not in your cone of vision.

Studentka2010 [4]3 years ago

5 0

Answer:

b. False

Explanation:

An object that is behind you, is not in your <em>cone of vision</em>, since your cone of vision, is an imaginary cone that projects from your eyes foward, approximate 60-degree angle straight foward. The cone of vision is the area of sight.

As you can not see behind you, an object behind you, is not in your cone of vision.

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A cable that weighs 8 lb/ft is used to lift 900 lb of coal up a mine shaft 650 ft deep. Find the work done. Show how to approxim

Harrizon [31]

Answer:

2275000 lb.ft

Explanation:

Let work done on the cable be denoted by: W_ca

Let work done on the coal be denoted by: W_co

Now, dividing the cable into segments, let x represent the length from top of the mine shaft to the segment.

Meanwhile let δx be the length of the segment.

We are told the cable weighs 8 lb/ft. Thus;

Work done on one segment = 8 × δx × x = 8x•δx

Therefore, work done on cable is;

W_ca = ∫8x•δx between the boundaries of 0 and 650

Thus;

W_ca = 4x² between the boundaries of 0 and 650

W_ca = 4(650²) - 4(0²)

W_ca = 1,690,000 lb.ft

Workdone on the 900 lb of coal will be calculated as;

W_co = 900 × 650

W_co = 585000 lb.ft

Thus,

Total work done = W_ca + W_co

Total workdone = 1690000 + 585000

Total workdone = 2275000 lb.ft

6 0

3 years ago

If you don’t know the answer please please don’t answer, I have to do this for a test and it’s 100 points

frutty [35]

Answer:

I believe that it's C

Explanation:

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STatiana [176]

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Answer:

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