B: mass
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Fillings in teeth should be made from a material which
A partially-inflated balloon is placed inside a bell jar. The bell jar is connected to an air pump. The air pump is s…
A gas is enclosed in a container of fixed volume. It gains heat energy from an external source. What happens to the m…
Four identical measuring cylinders contain liquid. Two contain water of density 1000 kg/m³. Two contain paraffin of d…
The diagram represents parts of a power station. What is the order of the energy changes taking place?
The centre of the Sun produces large amounts of energy. What is the source of this energy?