An engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100j of heat out of boiling water at 100∘c, do mechanical work of 80j, and exhaust 20j of heat at 10∘c. what, if anything, is wrong with this claim?

Explanation:

Intake heat, QH = 100 J

output heat, Qc = 20 J

Work, W = 80 J

TH = 100°C = 373 K

Tc = 10°C = 283 K

TH/ Tc =  373 / 283 = 1.318

QH/Qc = 100 / 20 = 5

for a heat engine, those ratios should be same. so temperature is not correct.

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