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aleksandr82 [10.1K]
3 years ago
14

(14 Points)

Physics
1 answer:
natta225 [31]3 years ago
8 0
True, the bulb did not light up
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Answer:potential difference is more or less like voltage. Using ohms, V=IR

Where V is Voltage

I is Current =0.4A

R is Resistance=20ohms

V=0.4*20

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Hence the potential difference will be 8V.

ii) V=0.4*30

V=12V

Explanation:

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From the calculations, when the resistance increase, the voltage will increase to appreciate the change.

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Answer A

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A mass of 100 kg is pulled by a 392 N force in the +X direction along a rough surface (uk=0.4) with uniform velocity v=20 m/s. W
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Answer:

The total work done will be zero.

Explanation:

Given that,

Mass = 100 kg

Force = 392 N

Velocity = 20 m/s

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Using balance equation

The net force will be

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The net force is zero.

Hence, The total work done will be zero by all forces on the object.

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