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A particle that moves uniformly in a circular path is accelerating yet moving at a constant speed. Explain this statement.

Acceleration is a change in velocity over time. Velocity is different to speed, because it has a direction (for example a car moving at 10 mph along a road heading north will have a greater velocity due nort...
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Answered by Anna L. • Physics tutor
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A model truck A of mass 1.2 kg is travelling due west with a speed of 0.90 m/s . A second truck B of mass 4.0 kg is travelling due east towards A with a speed of 0.35 m/s .

a) Calculate the magnitude of the total momentum of the trucks. The momentum (p) is the mass (m) of an object multiplied by its velocity (v). p = m x v Velocity is different to speed, because it has a direct...
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Answered by Anna L. • 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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