Physics
Which is a common first indicator of an approaching thunderstorm?

A buildup of dark clouds
Heavy wind
Too hot
Lightning

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Physics
A dynamo is used to convert

Electrical energy into magnetic energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into mechanical energy

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Physics
Acceleration is

Directly proportional to mass
Inversely proportional to mass
Directly proportional to force
Inversely proportional to force

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