If i add 30j of heat to a system so that the final temperature of the system is 300k, what is the change in entropy of the system? a)-1 j/k b)- 3 j/k c)- 1 j/k d)- 9 j/k e)- 10 j/k

The power source in a certain welding setup generates 3500w that is transferred to the low carbon steel work with a heat transfer factor of 0.85. the melting factor in the operation is 0.45. a continuous fillet weld is to be made with a cross-sectional area of 23 mm2 determine the travel speed at which the welding can be accomplished.