Paper is combustible because the paper is made from wood pulp which is an organic matter, it burns in presence of air.
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Q1
During a heavy rain,hailstones of average size 1.0 cm in diameter fall with an average speed of 20 m/s.Suppose 2000 hailstones strike every square meter of a 10m×10m roof perpendicularly in one second and assume that the hailstones do not rebound.Calculate the average force exerted by the falling hailstones on the roof.Density of a hailstone is 900 kgm3.
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