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Allan Pierce
08/17/2024 · Primary School

The intensity of illumination (I) of a light varies inversely as the square of the distance (d) from the light. At a distance of 20 m a light has an intensity of 100 candela. Find the intensity of the light at a distance of 25 m . [ 10 Marks] The extension in a spring (E) varies directly with the weight (W) suspended from it. If a weight of 452 g produces an extension of 3.2 cm , find (a) The extension produced by a weight of 810 g (b) The weight that would produce an extension of 10 cm [5 Marks] [5 Marks]

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- The intensity of the light at 25 m is 64 candela. - The extension produced by 810 g is approximately 5.75 cm. - The weight for a 10 cm extension is approximately 1408.45 g.

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