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A Carnot heat engine has an efficiency of 10%. If the same engine is worked backward to obtain a refrigerator, then find its coefficient of performance. A Carnot heat engine has an efficiency of 10%. If the same engine is worked backward to obtain a refrigerator then find its coefficient of performance. October 28, 2020 [...]

An object of mass 0.2kg executes simple harmonic oscillation along the x−axis with a frequency of (25/π)Hz. At the position x=0.04, the object has Kinetic energy of 0.5J and potential energy `0.4 J. The amplitude of oscillations is An object of mass 0.2kg executes simple harmonic oscillation along the x−axis with a frequency of (25/π)Hz. [...]

In which case will the efficiency of a Carnot cycle be higher ? (a) When the temperature of the source is increased by delta T. In which case will the efficiency of a Carnot cycle be higher ? (a) When the temperature of the source is increased by delta T. October 28, 2020 Category: Uncategorised [...]

The efficiency of a Carnot cycle is 1/6. By lowering the temperature of sink by 65 K, it increases to 1/3. Calculate the initial and final temperatures of the sink. it increases to 1/3. Calculate the initial and final temperatures of the sink. The efficiency of a Carnot cycle is 1/6. By lowering the temperature [...]

A Carnot engine is designed to operate between 480 K and 300 K. Assuming that the engine actually produces 1.2 kJ of mehanical energy per kcal of heat absorbed, compare A Carnot engine is designed to operate between 480 K and 300 K. Assuming that the engine actually produces 1.2 kJ of mehanical energy per [...]

The potential energy of a particle of mass 1 kg in motion along the x-axis is given by U=4(1−cos2x) J. Here x is in meter. The period of small oscillations (in sec) is The potential energy of a particle of mass 1 kg in motion along the x-axis is given by U=4(1−cos2x) J. Here x [...]

A refrigerator whose coefficient of performance is 5, extracts heat from the cooling compartment at the rate of 250 J/cycle. (a) How much work per cycle is required to operate A refrigerator whose coefficient of performance is 5 extracts heat from the cooling compartment at the rate of 250 J/cycle. (a) How much work per [...]

A refrigerator freezes water at 0 C into 10 kg ice at 0 C in a time interval of 30 min. Assuming the room temperature to be 20 C, calculate the minimum amount of power needed A refrigerator freezes water at 0 C into 10 kg ice at 0 C in a time interval of [...]

The frequency of a particle executing SHM is 10 Hz. The particle is suspended from a vertical spring. At the highest point of its oscillation, the spring is unstretched. Maximum speed of the particle is (g=10m/s^2) The frequency of a particle executing SHM is 10 Hz. The particle is suspended from a vertical spring. At [...]

A particle executing SHM of amplitude a has displacement a/2 at t=T/4 and a negative velocity. The epoch of the particle is A particle executing SHM of amplitude a has displacement a/2 at t=T/4 and a negative velocity. The epoch of the particle is October 28, 2020 Category: Cengage JEE Mains Physics by B.M Sharma [...]