A-LevelPhysicsForces, density and pressure9702/12 · Feb/Mar 2021 · Q141 Mark
A balance is used to measure the mass m of a number of cylindrical metal rods of length l. All the metal rods have the same radius r. The graph shows the variation with l of m. [Figure 14.1] The gradient of the graph is G. Which expression gives the density of the metal?
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AG / 2πr
BG2πr
CG / πr²
DGπr²
✓ Correct answer
C: G / πr²
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