A disc spinning with 24J of kinetic energy is kept in a container containing a fluid having a heat capacity of 2000J/K. When the disc comes to rest what will be the change in internal energy if ΔU = 3.5ΔT.(a) 0(b) 0.042J(c) 0.021J(d) 0.028JThe question was posed to me in semester exam.This intriguing question originated from First Law of Thermodynamics topic in division Thermodynamics of Physics – Class 11

A disc spinning with 24J of kinetic energy is kept in a container cont

1.	A disc spinning with 24J of kinetic energy is kept in a container containing a fluid having a heat capacity of 2000J/K. When the disc comes to rest what will be the change in internal energy if ΔU = 3.5ΔT.(a) 0(b) 0.042J(c) 0.021J(d) 0.028JThe question was posed to me in semester exam.This intriguing question originated from First Law of Thermodynamics topic in division Thermodynamics of Physics – Class 11
Answer» Right answer is (B) 0.042J The best I can explain: When the disc comes to REST all its kinetic energy will have been CONVERTED into INTERNAL energy of the system. The fluid has a heat capacity of 2000J/K which MEANS that for 24J the change in temperature will be 24/2000 = 0.012K. Given: ΔU = 3.5ΔT ⇒ ΔU = 3.5*0.012 = 0.042J.

Discussion

No Comment Found

Related InterviewSolutions

A block of mass 1kg is given a velocity of 5m/s on a horizontal flat surface. What will be the change in internal energy of the block-surface system, when the block comes to rest. The coefficient of kinetic friction is 0.3 and coefficient of static friction is 0.4.(a) 25J(b) 12.5J(c) 0(d) 30JThe question was asked in an internship interview.This intriguing question comes from First Law of Thermodynamics topic in chapter Thermodynamics of Physics – Class 11
Two bodies in thermal equilibrium can have different pressures. True or False?(a) True(b) FalseI had been asked this question in an international level competition.Enquiry is from Thermal Equilibrium in chapter Thermodynamics of Physics – Class 11
20J of heat energy is extracted from a cold reservoir when 30J of work is done on a refrigerator. What is the coefficient of the refrigerator?(a) 2/3(b) 5/3(c) 3/5(d) 1/3I have been asked this question during an interview.This question is from Thermodynamics topic in portion Thermodynamics of Physics – Class 11
What is the relation between work obtained in an reversible and irreversible process?(a) Wrev > Wirr(b) Wrev < Wirr(c) Wrev = Wirr(d) It depends on change in temperatureThe question was asked in quiz.I'd like to ask this question from Thermodynamics in division Thermodynamics of Physics – Class 11
What is a quasi-static process?(a) Irreversible(b) Reversible(c) In equilibrium at every state(d) Not involving frictionI have been asked this question during an interview.I would like to ask this question from Thermodynamics topic in division Thermodynamics of Physics – Class 11
Which law of thermodynamics says that efficiency of a heat engine cannot be 1?(a) First(b) Zeroth(c) Second(d) ThirdThis question was posed to me in exam.Origin of the question is Second Law of Thermodynamics in section Thermodynamics of Physics – Class 11
Select the correct statement.(a) Internal energy is a path variable(b) Heat is a path variable(c) Work done is a state variable(d) Internal energy is a microscopic variableI have been asked this question by my school teacher while I was bunking the class.This intriguing question originated from Thermodynamics topic in chapter Thermodynamics of Physics – Class 11
The variables like pressure, volume, temperature of a thermodynamic system are microscopic. True or False?(a) True(b) FalseI got this question in an online quiz.This is a very interesting question from Thermal Equilibrium in section Thermodynamics of Physics – Class 11
First law of thermodynamics is based on?(a) Conservation of energy(b) Conservation of mass(c) Conservation of momentum(d) Conservation of workThe question was asked in an online interview.I need to ask this question from First Law of Thermodynamics topic in portion Thermodynamics of Physics – Class 11
What will be the value of temperature of hot reservoir in a carnot cycle, if the temperature of cold reservoir is 25°C, heat absorbed from hot reservoir is 12J and heat rejected to cold reservoir is 4J?(a) 684K(b) 333.33K(c) 894K(d) 433.33KI got this question in an interview for job.My enquiry is from Thermodynamics in section Thermodynamics of Physics – Class 11

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment