Explanation
As the two gases are in thermal equilibrium, so Boyle’s law will be obeyed i.e. PAVA = PB VB.
Here mPV = a constant, hence line H.
For the given volume of the liquid, the sphere has the minimum surface area.
Average K.E. per molecule of a gas = 3/2 kT which is independent of mass of molecule but depends upon temp alone.
W = 2 S ∆A = 2 × 72 × (0.6 – 0.5) × 10 = 144 ergs
Average K.E. per molecule of a gas = 3/2 kT = a constant at a given temperature.
For a thinnest wire, the elongation in wire will be maximum for a given load, which is so corresponding to line OA.
Let the height of oil level in one side of U-tube be higher than water level in other arm of U-tube by h cm. Then pressure due to (h + 50) cm of oil column is equal to the pressure due to 50 cm of water column. So
(h + 50) × 0.8 × g = h × 1 × g
On solving, h = 12.5 cm.
The steamlined shaped body has less resistance due to air
The effective weight = weight of bird + reactional force due to acceleration of bird = 5 + ma = 5 + 0.5 × 2 = 6 N.
Temperature change in Celsius scale = Temperature change in Kelvin scale = 27 K.
Thermoelectric thermometer is based on Seebeck effect.
Production and measurement of temperature close to O K is done in cryogenics.
At absolute zero (i.e., OK) vrms becomes zero.
Zero Kelvin = –273oC (absolute temperature). As no matter can attain this temperature, hence temperature can never be negative on Kelvin scale.
For gases γ is more.
The boiling point of mercury is 400oC. Therefore, the mercury thermometer can be used to measure the temperature upto 360oC.
Rapidly changing temperature is measured by thermocouple thermometers.
Stress = YαΔθ ; hence it is independent of length.
Solids, liquids and gases all expand on being heated, as a result density (= mass / volume) decreases.
As coefficient of cubical expansion of liquid equals coefficient of cubical expansion of vessel, the level of liquid will not change on heating.
When the ball is heated, expansion of ball and cavity both occurs, hence volume of cavity increases.
In vapour to liquid phase transition, heat liberates.
Pressure inside the mines is greater than that of normal pressure.Also we know that boiling point increases with increase in pressure.
Due to large specific heat of water, it releases large heat with very small temperature change.
Melting point of ice decreases with increase in pressure. (as ice expands on solidification)
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