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KonstantinChe [14]
3 years ago
11

How many 176 ohm resistors are connected in series to get a current of 5 a on 220 v battey

Physics
1 answer:
Phantasy [73]3 years ago
4 0
Total resistance = voltage / current = 220 / 5 = 44 ohms .

Even one 176-ohm resistor is too much.  The current through it is 1.25 A,
and more than one of them in series reduces the current even further.

Connecting them in <em><u>parallel</u></em>, however . . .

Four resistors of 176-ohms each, in <u>parallel</u>, have a net effective resistance
of 176/4 = 44 ohms ... exactly what you need to do the job.

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Answer:

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Force from the support furthest = 61.9 N

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Let's say the length of the beam is L.  Let's say A is the near end of the beam and B is the far end of the beam.

Draw a free body diagram.  There are four forces on the beam:

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Sum of torques at A:

∑τ = Iα

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Rb = (½ (10.8 kg) + ¼ (3.66 kg)) (9.8 m/s²)

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∑F = ma

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Ra = Mg + mg − Rb

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Ra = (10.8 kg + 3.66 kg) (9.8 m/s²) − 61.9 N

Ra = 79.8 N

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