B: electrical to heat
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The diagram represents parts of a power station. What is the order of the energy changes taking place?
A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficienc…
A ball is held at rest on one side of a curved track. The ball is released. It rolls down one side of the track and p…
The diagrams show a small compass close to a strong bar magnet. Which diagram shows the correct compass direction?
A positively-charged rod is held close to, but not touching, an isolated metal sphere. Which diagram shows the charge…
A lightning flash carries 40 C of charge and lasts for 5.0 ms. What is the average current in the flash?