Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions)
Three rods AB, BC and BD of same length l and cross section A are arranged as shown. The end D is immersed in ice whose mass is 440 g and is at `0^@C`. The end C is maintained at `100^@C`. Heat is supplied at constant rate of 200 cal/s. Thermal conductivities of AB, BC and BD are K, 2K and `K//2`, respectively Time after which whole ice will melt is (`K=100 cal//m-s^@C A=10cm^2,l=1cm`)
24
Aug
Three rods AB, BC and BD of same length l and cross section A are arranged as shown. The end D is immersed in ice whose mass is 440 g and is at `0^@C`. The end C is maintained at `100^@C`. Heat is supplied at constant rate of 200 cal/s. Thermal conductivities of AB, BC [...]
The efficiency of an ideal gas with adiabatic exponent ‘gamma’ for the shown cyclic process would be
24
Aug
The efficiency of an ideal gas with adiabatic exponent ‘gamma’ for the shown cyclic process would be The efficiency of an ideal gas with adiabatic exponent 'gamma' for the shown cyclic process would be August 24, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,
In a room where the temperature is 30 C, a body cools from 61 C to 59 C in 4 minutes. The time taken by the body to cool from 51 C to 49 C will be
24
Aug
In a room where the temperature is 30 C, a body cools from 61 C to 59 C in 4 minutes. The time taken by the body to cool from 51 C to 49 C will be a body cools from 61 o C to 59 o C in 4 minutes. The time taken by [...]
A monoatomic gas (gamma=5//3) is suddenly compressed to (1//8) of its volume adiabatically then the pressure of the gas will change to
24
Aug
A monoatomic gas (gamma=5//3) is suddenly compressed to (1//8) of its volume adiabatically then the pressure of the gas will change to A monoatomic gas (gamma=5//3) is suddenly compressed to (1//8) of its volume adiabatically then the pressure of the gas will change to August 24, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]
On a two lane road,car A is travelling with a speed of 36km/h.Two cars B and C approach car A in opposite directions with a speed of 54km/h each. At a certain instant when the distance AB=AC,both being 1 km,B decides to overtake A before C does.What minimum acceleration of car B ia required to avoid an accident?
24
Aug
On a two lane road,car A is travelling with a speed of 36km/h.Two cars B and C approach car A in opposite directions with a speed of 54km/h each. At a certain instant when the distance AB=AC,both being 1 km,B decides to overtake A before C does.What minimum acceleration of car B ia required to [...]
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B decides to overtake A before C does.What minimum acceleration of car B ia required to avoid an accident? ,
both being 1 km ,
car A is travelling with a speed of 36km/h.Two cars B and C approach car A in opposite directions with a speed of 54km/h each. At a certain instant when the distance AB=AC ,
On a two lane road ,
Starting with the same initial conditions, an ideal gas expands from volume V 1 to V 2 in three different ways. The work done by the gas is W 1 if the process is purely isothermal, W 2 if purely isobaric and W 3 if purely adiabatic. Then
24
Aug
Starting with the same initial conditions, an ideal gas expands from volume V 1 to V 2 in three different ways. The work done by the gas is W 1 if the process is purely isothermal, W 2 if purely isobaric and W 3 if purely adiabatic. Then an ideal [...]
Two identical containers A and B with frictionless pistons contain the ideal gas at the same temperature and the same volume V. The mass of the gas in A is m A and in B is m B . The gas in each cylinder is now allowed to expand isothermally to the same final volume 2V. The changes in pressure in A and B are found to be Δp and 1.5ΔP respectively. Then:
24
Aug
Two identical containers A and B with frictionless pistons contain the ideal gas at the same temperature and the same volume V. The mass of the gas in A is m A and in B is m B . The gas in each cylinder is now allowed to expand isothermally to the same [...]
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calculate the initial rate of rise of temperature of the sphere The sphere may be treated as a black body rho_(copper) =8.93xx 10^(3)kg//m^(3) s = 3.7xx10^(2) Jkg^(-2) K^(-1) ,
sigma = 5.7 xx 10^(8) Wm^(-2) K^(-4) . ,
solid copper sphere of dimater 10mm is cooled to temperature of 150K and is then placed in an enclousure at 290K Assuming that all interchange of heat is by radiation ,
A car window pane of length 25 cm is hinged at the top and 5 cm of its lower portion is covered by a fixed pane. Calculate the maximum anlgle by which the window pane can be raised outward without letting rain water enter into the car when it races through rain ( falling vertically at 20 kmph) at 60 kmph.
24
Aug
A car window pane of length 25 cm is hinged at the top and 5 cm of its lower portion is covered by a fixed pane. Calculate the maximum anlgle by which the window pane can be raised outward without letting rain water enter into the car when it races through rain ( falling vertically [...]
Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300K. Piston of A is free to move and piston of B is fixed. Same amount of heat is given to the gases in two cylinders. Temperature of the gas in cylinder A increases by 30K. Then, increase in temperature of the gas in the cylinder B is: (γ=1.4 for diatomic gas)
24
Aug
Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300K. Piston of A is free to move and piston of B is fixed. Same amount of heat is given to the gases in two cylinders. Temperature of the gas in cylinder A increases by 30K. Then, increase [...]
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calculate the initial rate of rise of temperature of the sphere The sphere may be treated as a black body rho_(copper) =8.93xx 10^(3)kg//m^(3) s = 3.7xx10^(2) Jkg^(-2) K^(-1) ,
sigma = 5.7 xx 10^(8) Wm^(-2) K^(-4) . ,
solid copper sphere of dimater 10mm is cooled to temperature of 150K and is then placed in an enclousure at 290K Assuming that all interchange of heat is by radiation ,
A boat moves relative to water with a velocity which is n=2.0 times less than the river flow velocity. At what angle to the stream direction must the boat move to minimize drifting?
24
Aug
A boat moves relative to water with a velocity which is n=2.0 times less than the river flow velocity. At what angle to the stream direction must the boat move to minimize drifting? A boat moves relative to water with a velocity which is n=2.0 times less than the river flow velocity. At what angle [...]