b) A balloon c) it is more comfortable to sit on a bed than on a fence. d! We do not feel the atmospheric pressure even if it is of 100 kilopascal. e) The tip of an iron nail should be sharp. f Heavy vehicles are often fitted with wide tyres. B) Sports cars are often fitted with wide bald tyres. 1 Which will exert more pressure, a 110 kg mass on 5 m- area or 50 kg mass on 4 mm² area? Do calculations to find the answer 2 For the given block, which of its surface will exert minimum pressure? If its weight is 6 N, calculate the pressure in such a case. h = 6 cm 3. The elephant weighs 20,000 N and stands on one foot of area w = 6 cm 1000 cm'. How much pressure would it exert on the ground? 1 = 8 cm HOTS 1. What would happen if gravitational force of the Sun suddenly vanishes? 2. Earth attracts an apple from the tree and it falls on it but the earth does not move towards the apple. Why? Olympiad 1. The containers are all differently shaped but have the same height of fluid relative to the base. So, what is the relation among pressures at height h from the surface? D
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September 19, 1783
September 19, 1783On September 19, 1783 Pilatre De Rozier, a scientist, launched the first hot air balloon called 'Aerostat Reveillon'. The passengers were a sheep, a duck and a rooster and the balloon stayed in the air for a grand total of 15 minutes before crashing back to the ground.
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