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Draw a diagram to show how a rocket engine provides a force to move the rocket upwards. Label the diagram appropriately.
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Name the law involved in the following situation :
when person A standing on roller skates pushes another person B (also standing on roller skates) and makes him move to the right side, then the person A himself gets moved to the left side by an equal distance.
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State Newton’s third law of motion and give two examples to illustrate the law.
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Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
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The density of gold is 19 g/cm3. Find the volume of 95 g of gold.
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What is the mass of 5 m3 of cement of density 3000 kg/m3 ?
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What is the density of a substance of mass 100 g and volume 10 cm3 ?
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What is the difference between the density and relative density of a substance ?
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If the relative density of a substance is 7.1, what will be its density in SI units ?
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Calculate the density of an object of volume 3 m3 and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer.
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Write down an equation that defines density.
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5 kg of material A occupy 20 cm3 whereas 20 kg of materia! B occupy 90 cm3. Which has the greater density : A or B ? Support your answer with calculations.
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Define density. What is the SI unit of density ?
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Define relative density. What is the SI unit of relative density ?
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The density of turpentine is 840 kg/m3. What will be its relative density ? (Density of water = 1000 kg/m3)
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A piece of steel has a volume of 12 cm3, and a mass of 96 g. What is its density in g/cm3 ?
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A body floats in kerosene of density 0.8 x 103 kg/m3 up to a certain mark. If the same body is placed in water of density 1.0 x 103 kg/m3, will it sink more or less ? Give reason for your answer.
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When a golf ball is lowered into a measuring cylinder containing water, the water level rises by 30 cm3 when the ball is completely submerged. If the mass of ball in air is 33 g, find its density.
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A piece of steel has a volume of 12 cm3, and a mass of 96 g. What is its density in kg/m3 ?
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According to the third law of motion, action and reaction :
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