Explanation
Initially liquid oxygen will gain the temp, up to its boiling temperature then it change its state to gas. After this again its temperature will increase, so corresponding graph will be.
With rise in pressure melting point of ice decreases.Also ice contracts on melting
Celsius scale was the first temperature scale and Fahrenheit is the smallest unit measuring temperature.
Melting is associated with increasing of internal energy without change in temperature. In view of the reason being correct the amount of heat absorbed or given out during change of state is expressed Q = mL, where m is the mass of the substance and L is the latent heat of the substance.
The potential energy of water molecules is more. The heat given to melt the ice at 0°C is used up in increasing the potential energy of water molecules formed at 0°C.
Water evaporates quickly because of lack of atmospheric pressure, also temperature of moon is much higher during day time but it is very low at night.
Specific heat of a body is the amount of heat required to raise the temperature of unit mass of the body through unit degree. When mass of a body is less than unity,then its thermal capacity is less than its specific heat and vice-versa.
Water has maximum density at 4°C. On heating above 4°C or cooling below 4°C, density of water decreases and its volume increases. Therefore, water overflows in both the cases.
When two bodies at temperature T1 and T2 are brought in thermal contact, they do settle to the mean temperature (T1 +T2)/2. They will do so, in case the two bodies were of same mass and material, i.e., same thermal capacities. In other words, the two bodies may be having different thermal capacities, that’s why they do not settle to the mean temperature, when brought together.
When there is attraction between molecule, the potential energy decreases with decrease in distance, in case of force of repulsion between the molecules the potential energy increases with the decrease in distance between the molecules.
Volume of raft of wood = 120/600 = 0.2 cm3
Weight of water displaced = 0.2 × 103 × g = 200 kg wt
Mass of water displaced = 200 kg
Hence additional mass which can be added = 200 – 120 = 80 kg
Over a small temperature ranges, S.T. of water decreases linearly with rise of temperature.
When the ball is dropped in a viscous liquid, the speed of the ball, first increases due to gravity pull but the viscous force acting on the ball also increases with the increase in speed of ball, when viscous force balances gravity pull on ball, then the ball moves with constant velocity. Hence graph (b) is correct.
According to equation of continuity aυ = a constant. As υ increases, a decreases.
Velocity of the ball increase first due to gravity. Viscous drag on the ball goes on increasing due to increasing velocity. A stage comes when viscous drag balances the downward accelerating force. Now velocity becomes constant, which is called terminal velocity. The same is represented by curve C.
rms velocity of molecule depends only on the translational degree of freedom.
The net upwared force on the bottom of cylinder = wt. of liquid displaced by cylinder + thrust on the upper surface of cylinder due to h column of liquid = Vρg + hρg × πR2 = ρg (V + πR2h)
When frame is dipped into a soap solution and taken out, a soap film is formed on frame. When the portion A is punctured, the soap film of portion A will break. Due to surface tension, the portion of film in B will tend to have least surface area. Due to which the thread line between A and B will bend having concave shape towards A and convex shape towards B.
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