The members of truss are pin- connected at joint O as shown in figure. Determine the magnitude of F, and F2 for equilibrium.[Ans: F1 =3.59 kN , F2 = 0.536 kN]
4 KN
45°
6 KN

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.