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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 [...]
A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity ω. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be
24
Aug
A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity ω. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be A thin circular ring of mass [...]
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 [...]
Two boats, A and B, move away from a buoy anchored at the middle of a river along the mutually perpendicular straight lines: the boat A along the rive, and the boat B across the river. Having moved off an equal distance from the buoy the boats returned. Find the ratio of times of motion of boats τA/τB if the velocity of each boat with respect to water is η=1.2 times greater than the stream velocity.
24
Aug
Two boats, A and B, move away from a buoy anchored at the middle of a river along the mutually perpendicular straight lines: the boat A along the rive, and the boat B across the river. Having moved off an equal distance from the buoy the boats returned. Find the ratio of times of motion [...]
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A and B ,
move away from a buoy anchored at the middle of a river along the mutually perpendicular straight lines: the boat A along the rive ,
move with constant velocities v 1 and v 2 . At the initial moment their position vectors are r 1 and r 2 respectively. The condition for particles A and B for their collision is: ,
Two boats ,
Two particles A and B ,
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, 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) .
24
Aug
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, 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 = [...]
Tags:
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 double-pane window consists of two glass sheets each of area 1m^(2) and thickness 0.01m separated by a 0.05 m thick stagnant air space. In the steady state, the room glass interface and the glass outdoor interface are at constant temperature of 27^(@)C and 0^(@)C, respectively. (a) Calculate the rate of heat flow through the window pane. (b) Find the temperatures of other interfaces. [Take: thermal conductivities as K_(glass)=0.8Wm^(-1)K^(-1) and K_(air)=0.08Wm^(-1)K^(-1)]
24
Aug
A double-pane window consists of two glass sheets each of area 1m^(2) and thickness 0.01m separated by a 0.05 m thick stagnant air space. In the steady state, the room glass interface and the glass outdoor interface are at constant temperature of 27^(@)C and 0^(@)C, respectively. (a) Calculate the rate of heat flow through the [...]
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A double-pane window consists of two glass sheets each of area 1m^(2) and thickness 0.01m separated by a 0.05 m thick stagnant air space. In the steady state ,
Cubical expansivity of benzene =1.2xx10^(-3)K^(-1) Cubical expansivity of wood =1.5xx10^(-4)K^(-1) ,
Density of wood at 0^(@)C=8.8xx10^(2)kgm^(-3) ,
find the change in temperature at which wood will just sink in benzene. Density of benzene at 0^(@)C=9xx10^(2)kgm^(-3) ,
the room glass interface and the glass outdoor interface are at constant temperature of 27^(@)C and 0^(@)C ,
Using the following data ,
Two particles A and B, move with constant velocities v 1 and v 2. At the initial moment their position vectors are r 1 and r 2 respectively. The condition for particles A and B for their collision is:
24
Aug
Two particles A and B, move with constant velocities v 1 and v 2. At the initial moment their position vectors are r 1 and r 2 respectively. The condition for particles A and B for their collision is: move with constant velocities v 1 and v 2 [...]
A round disc of moment of inertia I2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I1 rotating with an angular velocity ω about the same axis. The final angular velocity of the combination of disc is
24
Aug
A round disc of moment of inertia I2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I1 rotating with an angular velocity ω about the same axis. The final angular velocity of the combination of disc is An electric fan has blades [...]