Consider two closed systems a and b. system a contains 3000 kj of thermal energy at 20°c, whereas system b contains 200 kj of thermal energy at 50°c. now the systems are brought into contact with each other. determine the direction of any heat transfer between the two systems.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.