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Vladimir79 [104]
3 years ago
6

Which student is doing work?

Physics
2 answers:
Vilka [71]3 years ago
8 0

Answer:

d

hope this helps

Explanation:

Alja [10]3 years ago
5 0

Answer: C, B

Explanation:

A-Rebecca is just leaning so she isn't doing any work.

B-Marcus is lifting, so that's work.

C-Starr is carrying so that's work too

D-Louis is only studying, he isn't doing nothing that he could make any work

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Why electrons flow in a wire when connected to a battery?
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Answer:

The metal atoms in the wire can't move, but their outer electrons can. The force pushes those electrons and they move to further parts of the wire, trying to reach the other end. As the electrons move away, new electrons flow into the wire through the battery to take their place.

Explanation:

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How does Newton's third law of motion describe forces?
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Read 2 more answers
A circular pipe of 25-mm outside diameter is placed in an airstream at 25C and 1-atm pressure. The air moves in cross flow over
kifflom [539]

Answer:

f_D = =3.24 N/m

Explanation:

data given

properties of air\nu\ of air =19.31*10^{-6} m2/s

\rho = 1.048 kg/m3

k = 0.0288 W/m.K

WE KNOW THAT

Reynold's number is given as

Re =\frac{VD}{\nu}

      = \frac{ 15*0.025}{19.31*10^{-6}}

      = 1.941 *10^4

drag coffecient is given as

C_D = \frac{f_D}{A_f\frac{\rho v^2}{2}}

solving for f_D

f_D = C_D A_f*\frac{\rho v^2}{2}

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Drag coffecient for smooth circular cylinder is 1.1

therefore Drag force is

f_D = 1.1*0.025 *\frac{1.048*15^2}{2}

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4 0
3 years ago
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