Physics

Problem

A heat engine is involved with exchange of heat of

1915 \text{ J}

-40 \text{ J}

+125 \text{ J}

and

-Q \text{ J}

, during one cycle achieving an efficiency of

50.0\%

. The value of

Q

is: a.

640 \text{ J}

40 \text{ J}

980 \text{ J}

400 \text{ J}