which is false?

Consider the following processes:

I.
Energy flows as heat from a hot object to a colder object

II.
Work is done on a system and an equivalent amount of energy is rejected as heat by the system

III.
Energy is absorbed as heat by a system and an equivalent amount of work is done by the system

is it just II?
Responses

physics - bobpursley, Wednesday, June 24, 2009 at 8:45pm
III is false also. There is no need for work to be done, it could have been stored as potential energy (like in mech or chem energy).

I did this answer (II and III false) but it was wrong.... is it just III that is false?

II is wrong, III is wrong. If I were you I would discuss it with your instructor.

To determine which statement is false, let's examine each statement:

I. Energy flows as heat from a hot object to a colder object
This statement is true according to the laws of thermodynamics. Heat always flows from a higher temperature object to a lower temperature object.

II. Work is done on a system, and an equivalent amount of energy is rejected as heat by the system
This statement is true. According to the first law of thermodynamics, when work is done on a system, the energy gained by the system is equal to the sum of the work done on the system and the heat absorbed by the system.

III. Energy is absorbed as heat by a system, and an equivalent amount of work is done by the system
This statement is false. In reality, when energy is absorbed as heat by a system, it does not necessarily mean that an equivalent amount of work is done by the system. Energy absorbed as heat is often dissipated or stored as potential energy within the system instead of being converted directly into work.

Based on this analysis, the false statement is III.