Question

4 which direction does thermal energy move?
a. from colder to warmer objects b. from warmer to colder objects
c. only from solids to liquids d. both a. and b.
5 which of the following is the best example of the process of radiation?
a. a piece of paper is torn in half b. warmed air rises above a candle
c. socks are warmed up by placing them on a woodstove d. sunlight warms a greenhouse

Explanation:

Question 4

Thermal energy transfer follows the second law of thermodynamics. Heat naturally flows from regions of higher temperature (warmer objects) to regions of lower temperature (colder objects). Option a violates the natural direction of heat flow. Option c is incorrect as thermal energy transfer is not restricted to solids to liquids. Option d is wrong because only the direction from warmer to colder is correct.

Radiation is the transfer of heat in the form of electromagnetic waves. Sunlight (electromagnetic waves) warming a greenhouse is radiation. A piece of paper being torn is a physical change (not heat transfer). Warmed air rising is convection. Socks on a wood - stove involve conduction (direct contact heat transfer).

Answer:

b. from warmer to colder objects

Question 5