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Why? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh A boy gets into a floating boat. (a) What happens to the boat? (b) What happens to the weight of water displaced? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh When a golf ball is lowered into a measuring cylinder containing water, the water level rises by 30 cm^3 when the ball is completely submerged. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh A beaker full of water is suspended from a spring balance. Will the reading of the balance change: (a) if a cork is placed in water? (b) if a piece of heavy metal is placed in it? Give reasons for your answer. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh If a fresh egg is put into a beaker filled with water, it sinks. On dissolving a lot of salt in the water, the egg begins to rise and then floats. Why? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Giving reasons state the reading on a spring balance when it is attached to a floating block of wood which weights 50 g in air. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh A body floats in kerosene of density 0.8 x 10^3 kg/m^3 up to a certain mark. If the same body is placed in water of density 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Two different bodies are completely immersed in water and undergo the same loss in weight. Is it necessary that their weights in air should also be the same? Explain. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh If two equal weights of unequal volumes are balanced in air, what will happen when they are completely dipped in water? Why? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh An elephant weighing 40,000 N stands on one foot of area 1000 cm^2 whereas a girl weighing 400 N is standing on one ‘stiletto’ heel of area 1 cm^2. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh How does a boat float in water? (b) A piece of steel has a volume of 12 cm^3, and a mass of 96 g. What is its density: 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh What are fluids? Name two common fluids. (b) State Archimedes’ principle. (c) When does an object float or sink when placed on the surface of a liquid? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Define pressure. (b) What is the relation between pressure, force and area? (c) Calculate the pressure when a force of 200 N is exerted on an area of: 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh State the principle of flotation. (b) A floating boat displaces water weighing 6000 newtons. (i) What is the buoyant force on the boat? (ii) What is the weight of the boat? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Define buoyant force. Name two factors on which buoyant force depends. (b) What is the cause of buoyant force? (c) When a boat is partially immersed in water, it displaces 600 kg of water. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Write down an equation that defines density. (b) 5 kg of material A occupies 20 cm^3 whereas 20 kg of material B occupy 90 cm^3. Which has the greater density A or B? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh An object weighs 500 grams in air. This object is then fully immersed in water. State whether it will weigh less in water or more in water. Give reason for your answer. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Calculate the density of an object of volume 3 m^3 and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh A girl is wearing a pair of flat shoes. She weighs 550 N. The area of contact of one shoe with the ground is 160 cm^2. 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh A pressure of 10 Pa acts on an area of 3.0 m^2. What is the force acting on the area? What force will be exerted by the application of same pressure if the area is made one-third? 3 years ago BidishaKashayap1333 class 9 gravitation lakhmir singh Page 1 / 5 1 2 3 4 5 Next Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? Δ Home About Us Contact Us Privacy Policy Term of Use Copyright © 2020 Eanshub All Rights Reserved
