A country consumes about 3.1 x 108 kg of rice in a year. A grain of rice has a mass of about 2.5 x 1

Question

A country consumes about 3.1 x 108 kg of rice in a year. A grain of rice has a mass of about 2.5 x 10-5 kg and a length of about 6 mm. - Estimate the number of grains of rice consumed in a year, giving your answer in standard form. - If these grains were laid end to end, estimate the total length in kilometres, in standard form. - The distance from the Earth to the Sun is about 1.5 x 108 km. A student claims the line of grains would reach the Sun. Use your answer to **(b)** to comment on the claim, and state one assumption in your estimate.

Accepted Answer

(a) $1.24\times10^{13}$ (b) $7.44\times10^{7}$ km (c) About half the Earth–Sun distance, so the claim is false; grains assumed identical and touching

A year of rice grains laid end to end

A year of rice grains laid end to end

Solution:

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