Question

ΔK + ΔU + ΔEint = W + Q + TMW +TET + TER
(a) the heating coils in your toaster during the first five seconds after you turn the toaster on

ΔU = W + Q + TMW + TMT

0 = Q + TMT + TET + TER


ΔU = Q + TMT

ΔK = W + Q

ΔEint = Q + TET + TER

ΔK + ΔU + ΔEint = W + Q + TMW + TMT

ΔEint = W + Q + TET

(b) your automobile from just before you fill it with gas until you pull away from the gas station at speed v

ΔK + ΔU + ΔEint = W + Q + TMW + TMT

ΔU = W + Q + TMW + TMT


ΔK = W + Q

ΔEint = Q + TET + TER

ΔEint = W + Q + TET

0 = Q + TMT + TET + TER