An inventor claims to have developed a power cycle capable of delivering a net work output of 400 kJ for an energy input by heat transfer of 1200 kJ. The system undergoing the cycle receives heat from a source of 550K and rejects heat to a sink of 350K. Determine if this is a valid claim.

Valid claim

Explanation:

Given

Work output is

Work input is

The temperature of the source

The temperature of the sink is

Efficiency is given by

Insert the values

For ideal cycle it is

The efficiency of the cycle is less than the ideal situation, therefore, it is valid claim.

c) up is the direction the magnetic force is acting on the charge.