2. Usually weather data is collected by releasing He or Hz filled balloons carrying the required measuring instruments into the atmosphere. In one such experiment a balloon, which is initially flat,...

Extracted text: 2. Usually weather data is collected by releasing He or Hz filled balloons carrying the required measuring instruments into the atmosphere. In one such experiment a balloon, which is initially flat, is slowly filled with hydrogen from a cylinder forming a sphere of radius 1m. Calculate the work done by the balloon-cylinder system.