A room contains 60 kg of air at 100 kPa and 15°C. The room has a 250 W refrigerator (the refrigerator consumes 250 W of electricity when running), a 120 W TV, a 1 kW electric resistance heater, and a 50-W fan. During a cold winter day, it is observed that the refrigerator, the TV, the fan, and the electric resistance heater are running continuously but the air temperature in the room remains constant. The rate of heat loss from the room that day is

A room contains 60 kg of air at 100 kPa and 15°C. The room has a 250

1.	A room contains 60 kg of air at 100 kPa and 15°C. The room has a 250 W refrigerator (the refrigerator consumes 250 W of electricity when running), a 120 W TV, a 1 kW electric resistance heater, and a 50-W fan. During a cold winter day, it is observed that the refrigerator, the TV, the fan, and the electric resistance heater are running continuously but the air temperature in the room remains constant. The rate of heat loss from the room that day is
A.	3312 kJ/h
B.	4752 kJ/h
C.	5112 kJ/h
D.	2952 kJ/h
Answer» D. 2952 kJ/h

Discussion

No Comment Found

Related MCQs

What reaction takes place during photosynthesis?
Which among this is not an exothermic reaction?
SI unit of enthalpy is_______
At constant pressure P the volume of a gas increases from V1 to V2 when ‘Q’ amount of heat is removed from the system. What will happen to internal energy?
In the given system, 20J of heat is supplied to the gas molecules. The spring is initially not elongated or compressed. If the spring gets compressed by 1cm. Calculate the change in internal energy of the system. Spring constant = 200N/m. Assume piston moves slowly.
In the process A to B to C, 20J of heat is supplied from A to B. 20.5J of heat has been removed from B to C and 2J of heat has been added from C to A. Calculate the value of ‘v’ from the given conditions in the diagram. The values of pressure and volume given in the graph are in S.I. units.
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.
Consider a gas contained in a rigid container of volume 20m3. What will be the change in internal energy if 50J of heat is provided to it? Assume the gas exerts a pressure of 1atm on the walls.
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.
What is the relation between the internal energy and heat supplied in the process 1 & 2 shown in the diagram? Both paths start at A and end at B.

Discussion

No Comment Found

Related MCQs

Reply to Comment