FRANK Solutions for Class 9 Physics Chapter 5 - Heat - Thermal Expansion
Get free access to complete Frank Solutions for ICSE Class 9 Physics Chapter 5 Heat - Thermal Expansion at TopperLearning. Dive deeper into the concept of heat by learning about the different types of thermal expansion. Also, revise the uses of a thermostat and a bimetallic strip.
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Chapter 5 - Heat - Thermal Expansion 202
(ii).Coefficient of superficial expansion is equal to the change in area of a rod of area 1m2 when its temperature rises by 10c.
(iii).Coefficient of volume expansion is equal to the change in volume of a rod of volume 1m3 when its temperature rises by 10c.
(a). When boiling water is poured into a glass bottle, it generally cracks because on pouring hot water in the bottle the inner surface heats up and expands more as compared to its outer surface. This unequal expansion between the two surfaces causes a strain and the bottle cracks.
(b). Telephone wires sag in summer because due to heat of the sun, the wire expands and increases in length, thus they sag in summer.
(c). In cold countries water pipes burst in winter because the water has maximum density at 40C and, due to anomalous expansion of water, it expands when the water is cooled to a temperature below 40C
(d). Even when the water in the lakes is frozen, fishes can survive due to anomalous expansion of water, water has maximum density at 40C and this dense water remains at the bottom of the lake and the upper layer of water is less dense and freezes but the temperature of each layer of water below increases by 10C. Thus it is warmer in the lakes below the ice layer. This helps the fishes to survive.
(ii). Telephone wires sag in summer because due to heat of the sun, the wire expands and increases in length, thus they sag in summer.
(iii).In cold countries water pipes burst in winter because the water has maximum density at 40C and, due to anomalous expansion of water, it expands when the water is cooled to a temperature below 40C
(iv).Even when the water in the lakes is frozen, fishes can survive due to anomalous expansion of water, water has maximum density at 4(i). When boiling water is poured into a glass bottle, it generally cracks because on pouring hot water in the bottle the inner surface heats up and expands more as compared to its outer surface. This unequal expansion between the two surfaces causes a strain and the bottle cracks.
(ii). Telephone wires sag in summer because due to heat of the sun, the wire expands and increases in length, thus they sag in summer.
(iii).In cold countries water pipes burst in winter because the water has maximum density at 40C and, due to anomalous expansion of water, it expands when the water is cooled to a temperature below 40C
(iv).Even when the water in the lakes is frozen, fishes can survive due to anomalous expansion of water, water has maximum density at 40C and this dense water remains at the bottom of the lake and the upper layer of water is less dense and freezes but the temperature of each layer of water below increases by 10C. Thus it is warmer in the lakes below the ice layer. This helps the fishes to survive.C and this dense water remains at the bottom of the lake and the upper layer of water is less dense and freezes but the temperature of each layer of water below increases by 10C. Thus it is warmer in the lakes below the ice layer. This helps the fishes to survive.
Chapter 5 - Heat - Thermal Expansion 203
(ii). Increases; decreases
(iii). Coefficient; expansion
(iv). Anomalous expansion of water
(v). Calorie
(iv). Kelvin(K)
(a). material of the rod
(b). Original length of the rod
(c). Rise in temperature
(a). Its internal diameter will increase as the copper washer expands outwards
(b). Volume will increase as the size of the metal expands on heating
(c). Mass will remain the same as the mass does not change with change in temperature
(d). Density will decrease as the volume of the washer increases on heating and density is inversely proportional to volume
(e). External diameter will increase because the copper washer expands outwards
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