Question Answers
Sahay Sir > Question Answers
A uniform metallic disc of radius r and mass m is spinning with angular speed omega_(0) about an axis passing through its centre and perpendicular to plane. If its temperature is increased (slightly) by DeltaT its new angular speed is (The coefficient of linear expansion of the metal is alpha)
05
Sep
A uniform metallic disc of radius r and mass m is spinning with angular speed omega_(0) about an axis passing through its centre and perpendicular to plane. If its temperature is increased (slightly) by DeltaT its new angular speed is (The coefficient of linear expansion of the metal is alpha) The quantity PV/KT (k = [...]
A brass boiler has a base area of 0.15m^2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg / min when placed on a gas stove. The temperature of the part of the flame in contact with the boiler is. Thermal conductivity of brass =107.4 Js^−1 m^−1 K^ −1 ; Heat of vaporization of water =2256 × 10^3 Jkg^−1 .
05
Sep
A brass boiler has a base area of 0.15m^2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg / min when placed on a gas stove. The temperature of the part of the flame in contact with the boiler is. Thermal conductivity of brass =107.4 Js^−1 m^−1 K^ −1 ; Heat [...]
Consider isothermal expansion of 0.5 mole of an ideal gas when Q amount of heat is added to it. Following graph shows variation in final volume V with Q. Find the temperature of the gas (ln 3 ≈ 10, R = 3/25 J/mole−K)
05
Sep
Consider isothermal expansion of 0.5 mole of an ideal gas when Q amount of heat is added to it. Following graph shows variation in final volume V with Q. Find the temperature of the gas (ln 3 ≈ 10, R = 3/25 J/mole−K) Consider isothermal expansion of 0.5 mole of an ideal gas when Q [...]
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500 °C and then placed on a large ice block at (0 degree). What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g^–1 K^–1; heat of fusion of water = 335 J g^–1).
05
Sep
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500 °C and then placed on a large ice block at (0 degree). What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g^–1 K^–1; heat of fusion of water = 335 [...]
A rod of length 1000 mm and co-efficient of linear expansion α=10^−4 per degree c is placed symmetrically between the two fixed walls separated by 1001 mm. then young’s modulus of the rod is 10^11 N/m^2 . if the temperature is increased by 20 degree C , then the stress develop in the rod is (in N/m^2 )
05
Sep
A rod of length 1000 mm and co-efficient of linear expansion α=10^−4 per degree c is placed symmetrically between the two fixed walls separated by 1001 mm. then young’s modulus of the rod is 10^11 N/m^2 . if the temperature is increased by 20 degree C , then the stress develop in the rod is [...]
A certain amount of ideal monoatomic gas undergoes a process given by TV^(1/2) = constant. The molar specific heat of the gas for the process will be given by
05
Sep
A certain amount of ideal monoatomic gas undergoes a process given by TV^(1/2) = constant. The molar specific heat of the gas for the process will be given by A certain amount of ideal monoatomic gas undergoes a process given by TV^(1/2) = constant. The molar specific heat of the gas for the process will [...]
A gas at the temperature 250 K is contained in a closed vessel. If the gas is heated through 1 K, then the percentage increase in its pressure will be
05
Sep
A gas at the temperature 250 K is contained in a closed vessel. If the gas is heated through 1 K, then the percentage increase in its pressure will be A gas at the temperature 250 K is contained in a closed vessel. If the gas is heated through 1 K then the percentage increase [...]
A thin rod of negligible mass and area of cross-section 2∗10^−5 m^2 , suspended vertically from one end, has a length of 0.5 m at 200^∘ C. The rod is cooled to 0^∘C, but length is kept same by attaching a mass at the lower end. The value of this mass is (Young’s modulus = 10^11 N/m^2 , Coefficient of linear expansion 10^−5 K^−1 ).
05
Sep
A thin rod of negligible mass and area of cross-section 2∗10^−5 m^2 , suspended vertically from one end, has a length of 0.5 m at 200^∘ C. The rod is cooled to 0^∘C, but length is kept same by attaching a mass at the lower end. The value of this mass is (Young’s modulus = [...]
Tags:
A thin rod of negligible mass and area of cross-section 2∗10^−5 m^2 ,
but length is kept same by attaching a mass at the lower end. The value of this mass is (Young's modulus = 10^11 N/m^2 ,
Coefficient of linear expansion 10^−5 K^−1 ). ,
has a length of 0.5 m at 200^∘ C. The rod is cooled to 0^∘C ,
suspended vertically from one end ,
Earth receives 1400 W/m^2 of solar power. If all the solar energy falling on a lens of area 0.2m^2 is focussed onto a block of ice of mass 280 grams, the time taken to melt the ice will be (Latent heat of fusion of ice =3.3×10^5 J/kg).
05
Sep
Earth receives 1400 W/m^2 of solar power. If all the solar energy falling on a lens of area 0.2m^2 is focussed onto a block of ice of mass 280 grams, the time taken to melt the ice will be (Latent heat of fusion of ice =3.3×10^5 J/kg). Earth receives 1400 W/m^2 of solar power. If [...]
What must be the lengths of steel and copper rods at 0 degree C for the difference in their lengths to be 10 cm at any common temperature?
05
Sep
What must be the lengths of steel and copper rods at 0 degree C for the difference in their lengths to be 10 cm at any common temperature? What must be the lengths of steel and copper rods at 0 degree C for the difference in their lengths to be 10 cm at any common [...]