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Why does your hair stand on end when you touch a Van de Graaff generator?

This is all down to static electricity. Inside the Van de Graaff generator, there is a rubber band and rollers. As they are electrically insulated, when the motor turns they rub together and electrons are 'k...
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Answered by Tom W. • Physics tutor
83036 Views

What is the difference between a scalar and a vector?

As often described, a vector is a quantity that has a magnitude and a direction, whereas a scalar just has a magnitude. The easiest way to thing about it is to physically think if you could point in a direct...
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Answered by Pavit B. • Physics tutor
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A note was played on an electric keyboard. The frequency of the note was 440Hz. What does a frequency of 440 Hz mean?

A Frequency of 440Hz means that the wave is oscillating 440 times in one second. Ie. 440 waves are produced every second
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Answered by Nick P. • Physics tutor
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Explain the difference between a battery and a cell

A cell is a single unit of a power supply which uses chemical energy to produce energy. A battery is a group of cells joined in series.
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Answered by Cristina O. • Physics tutor
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A single wind turbine has a maximum power output of 2 000 000 W. The wind turbine operated continuously at maximum power for 6 hours. Calculate the energy output in kilowatt-hours of the wind turbine.

Equation: P = Wt (Power = Work[Energy] x time)1) Convert Watts to Kilowatts (W -> kW)2,000,000W -> 2,000kW [divide by 1000]2) Multiply work by time (remembering the question asks for kWh)2,000kW x 6h =...
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Answered by Nathan L. • Physics tutor
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