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The temprature at which the vapour pressure of a liquid becomes equals of the external pressure is its.
At boiling point vapour pressure becomes equal to the external pressure
10 g of ice at $0 ^\circ C$ is mixed with 100 g of water at $50 ^\circ C $ what is the resultant temprature of mixture.
$ \theta_{mix} = { mw \theta w - { miLi \over cw } \over mi + mw } $
Two metal strips that constituate a thermostant must necessarily in their
Thermostat is used in electric apporatas like refrigerator iron etc for automatic cut off Therefore for metallic strips to bend on heating their coefficient of linear expansion should be different.
2 kg of Ice at $ -20 ^\circ C $ is mixed with 5 kg of water at $ 20 ^\circ C $ in an insulating vessel having a megligible heat capacity calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice care $ 1 keal/kg per ^\circ C $ and $ 0.5 Keal/kg 1 ^\circ C$ while the latent heat of fusion of ice is 80 kcoil/kg.
Initially ice will absorb heat to rise its temprature to $0 ^\circ C $ then its melting takes place. If mi = Initial mass of ice mi-1 = Mass of ice that melts and mw = Initial mass of water By low of mixture Heat gained by ice = Heat lost by water $ \Rightarrow mi \times c \times (20) + mi + L = mwC_w (20) $ $ \Rightarrow 2 \times 0.5 (20) + mi \times 80 = 5 \times 1 \times 20 \Rightarrow mi^{-7} = 1 kg $ So final mass water Initial mass of water + mass of ice that melts = 5 + 1 = 6 kg
A lead bullet at $ 27 ^\circ C$ just melts when stopped by an obstancle Assuming that 25% of heat is obsorbed by the obstacle then the velocity of the bullet at the time of striking.
If mass of the bullet is mgm then total heat required for bullet to just melt down. $ \theta_1 = mc \triangle \theta + mL $ Now when bullet is stopped bythe obstacle the loss in its mechanical energy = $ {1 \over 2 } cm \times 10 ^ {-3} v^2 9 $ $ (As mg = m \times 10 ^ {-3} kg ) $ As 25% of this energy is absorbed by the $ \theta_2 = { 75 \over 100 } \times {1 \over 2} mv^2 \times 10^{-3} = {3 \over 8} mv^2 \times 10 ^ {-3} J $ Now the bullet melt if $ \theta_2 \geq \theta_1 $
An electric kettle takes 4A current at 220V How much time will it take to boil 1 kg of water from temprature $2 ^\circ C$ ? The temprature of boiling water is $10 ^ \circ C$ .
$ P \times t = mc \triangle \theta $ $ \Rightarrow t = { mc \triangle \theta \over p } = { 4200 m \triangle \theta \over p } = { 4200 \times m \times \triangle \theta \over VI } $ $ \{ \therefore water = 4200 { 1 \over kg } \times {^ \circ C} \} $ $ \Rightarrow t ={ 4200 \times 1 \times (100 -20 ) \over 220 \times 4 }= 381 sec \approx 6.3 min $
Assertion & Reason Read the assertion and reason carefully to mark the correct option out of the option given below. Assertion : The melting point of the ice decreases with increases pressure Reason : Ice contracts on melting
With rise in pressure melting point of ice decreases also ice contracts on melting.
Assertion & Reason Read the assertion and reason carefully to mark the correct option out of the option given below. Assertion : Fahrenheit is the smallest unit measuring temperature. Reason : Fahrenheit was the first temperature scale used for measuring temperature.
Celsius scale was the first temperature scale and fahrenheit is the smallest unit measuring temperature
Assertion & Reason Read the assertion and reason carefully to mark the correct option out of the option given below. Assertion : Melting of solid causes no change in internal energy. Reason :Latent heat is the heat required melt a unit mass of solid.
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 where m is the mass of the substances and L is the latent heat of the substance.
Assertion & Reason Read the assertion and reason carefully to mark the correct option out of the option given below. Assertion : Specific heat capacity is the cause of formation of land and sea breeze. Reason : The specific heat of water is more then land.
If bath assertion and reason are true and the reason is the correct explanation of the assertion.
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