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ohaa [14]
3 years ago
15

Fuel cells have been developed that can generate a large amount of energy. For example, a hydrogen fuel cell works by combining

hydrogen and oxygen gas to produce water and electrical energy. If a fuel cell can generate 10.0 kilowatts of power and the current is 15.8 amps, what is the voltage of the electricity?
Physics
1 answer:
maksim [4K]3 years ago
7 0
Electric power is given by:
Power = voltage x current
10000 = 15.8V
V = 633 Volts
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Answer:

F = 352 N

Explanation:

we know that:

F*t = ΔP

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where F is the force excerted by the wall, t is the time, M the mass of the ball, V_f the final velocity of the ball and V_i the initial velocity.

Replacing values, we get:

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3 years ago
A 1000 kg satellite and a 2000 kg satellite follow exactly the same orbit around the earth. What is the ratio F1/F2 of the gravi
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Answer:

the <em>ratio F1/F2 = 1/2</em>

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Explanation:

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Therefore,

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F1/F2 = m1/m2

F1/F2 = 1000/2000

<em>F1/F2 = 1/2</em>

The other force that the two satellites experience is the centripetal force. Therefore,

F1c = m1 v² / r    and

F2c = m2 v² / r

where

  • m1 is the mass of satellite 1
  • m2 is the mass of satellite 2
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Thus,

a1 = v² / r ⇒ v² = r a1    and

a2 = v² / r ⇒ v² = r a2

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F1c = m1 a1 r / r = m1 a1

F2c = m2 a2 r / r = m2 a2

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F1 = F1c

G M_e m1 / r² = m1 a1

a1 = G M_e / r²

also

a2 = G M_e / r²

Thus,

a1/a2 = [G M_e / r²] / [G M_e / r²]

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tamaranim1 [39]

Answer:

Following are the responses to these question:

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