Which of the following statements is not true about underage drinking?

List 3 options on how to reduce knocking problens during engine process,

An inventor claims to have developed a reversed heat engine (ie. a heat pump) which is able to deliver 10 kj heat into the room at 20°c from outside ambient temperature of -10°c by consuming only 2 kj electricity in winter. this claim is a)-impossible b)-possible only if the heat pump is ideal c)-practically possible d)-unable to be assessed as it depends on the working fluid used in the heat pump.

Derive the 2-d finite difference equation for a uniform grid for a node: a) at a plane surface with a uniform heat flux b) at an internal corner with convection