PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
During a hailstorm, ice pellets (hailstones) strike a horizontal glass roof.
Average data for the storm are as follows: mass of each hailstone = 8 g, speed on impact = 15 m/s, and rate of impact = 200 hailstones per square metre per second.
Use these data to answer the following for a 1 m2 area of roof.
(i) Calculate the total kinetic energy delivered to the 1 m2 area in the first 60 s of the storm.
(ii) A popular chocolate bar supplies about 2.0×104J of energy per 100 g when metabolised. Determine the mass of chocolate whose food energy equals the energy calculated in part (i).