If massenergy equivalence is taken into account, when water is cooled to form ice, the mass of water should
(a) increase
(b) remain unchanged
(c) decrease
(d) first increase then decrease.
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Thickness of ice on lake's surface is 5 cm. Find time required for ice's thickness to double. Data in description.
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Thickness of ice on lake's surface is 5 cm. Find time required for ice's thickness to double. Data in description.
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A thin circular copper plate, a sphere and a cube of same mass and material are heated to 373K. If cooled which one will cool 1st?
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At room temperature, the vapour pressure of liquid ammonia is very high. On cooling vapour pressure decreases, therefore the liquid ammonia will not splash out
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Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?
It is due to condensation of water vapours present in air. Air contains water in the form of vapours, when it comes in contact of cool water bottle, it gets...
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Conversion of ice into water and water into ice is an example of change which can be reversed.
(i) Melting of wax (ii) Folding of a paper (iii) Knitting of a sweater (iv) Inflating of a tyre
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Consider an ice cube of edge 1.0 cm kept in a gravity free hall. Find the surface area of the water when the ice melts.
Surface area = 4πr2
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50 m^3 of saturated vapour is cooled down from 30°C to 20°C. Find the mass of the water condensed.
50 cm3 of saturated vapour is cooled 30° to 20°. The absolute humidity of saturated H2O vapour 30 g/m3 Absolute humidity is the mass of water vapour present in a given...
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What is Mass-energy equivalence?
Mass-energy equivalence states that mass is concentrated energy. In his theory of special relativity Einstein formulated the equation E=mc2. There is a tremendous amount of energy in mass. A 20g marble contains as much energy as a 500 kiloton...
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