B: balance and a ruler
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A beam pivoted at one end has a force of 5.0 N acting vertically upwards on it as shown. The beam is in equilibrium. …
Four objects of equal mass rest on a table. The centre of mass of each object is labelled G. Which object is the leas…
A 100 g mass is suspended from a spring next to a vertical metre rule. The top of the spring is level with the 0.0 cm…
A radioactive nuclide ²³⁸₉₂U decays into thorium by emitting an alpha-particle. The thorium then decays into protacti…
Chlorine exists as two isotopes. One has a nucleon number (mass number) of 35 and the other has a nucleon number (mas…
A manufacturer measures accurately the dimensions of a wooden floor tile. The approximate dimensions of the tile are …