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3 years ago

14

Estimate how many electrons there are in the human's body. asssume the mass is 70 kg. (hint: most of the atoms in your body have

equal numbers of electrons, protons, and neutrons.)

1 answer:

Karolina [17]3 years ago

8 0

How about 8 X 10 to the 100th power.

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A spring whose spring constant is 270 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu, required

cricket20 [7]

Answer:

0.02585 BTU

Explanation:

Given: Spring constant, k = 270 lbf/in

Initial force, f =100 lbf

Compression, x = 1 in

Work done can be calculated as follows:

$W = \int {(f+kx)} \, dx \\W = fx + \frac{1}{2}kx^2\\W= (100 lbf)(1 in)+ \frac{1}{2}(270 lbf/in)(1 in)^2\\W= 100+135 = 235 lbf in\\W=235 \times 0.00011 BTU = 0.02585 BTU$

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In this case to find the weight of an object you must use the formula.

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