The form of energy that flows from hot object to a cold object is called

Question 1: The form of energy that flows from hot object to cold object is heat.

Heat always flows from higher temperature to lower temperature.

Step 1: Metal feels colder than wood at same temperature below body temperature because metal conducts heat faster from hand.

$(a)$ Metal feels colder compared to wood. True

$(b)$ Metal conducts heat more than wood. True

$(c)$ Reflects more heat than wood. False (reflection not relevant; conduction matters)

Question 2: Assume $X$ body temperature $98.6^\circ\mathrm{F}$ and $Y$ lower (e.g., $98^\circ\mathrm{F}$).

Heat flows from higher to lower temperature body.

Step 1: Compare temperatures: $98.6^\circF > 98^\circ\mathrm{F}$.

$(a)$ $X$ has higher body temperature than $Y$. True

$(b)$ $X$ has lower body temperature than $Y$. False

$(c)$ Both have same body temperature. False

Question 3: Boiling point of water is $100^\circ\mathrm{C}$.

Step 1: Water starting at lower temperature needs more heat to reach $100^\circ\mathrm{C}$.

$(a)$ Water from $20^\circ\mathrm{C}$ to boil needs more heat/time than from higher temperature. True

$(b)$ Water from more than $50^\circ\mathrm{C}$ but less than $80^\circ\mathrm{C}$ needs more heat. False (needs less than from $20^\circ\mathrm{C}$)

Question 4: Iron ball at $40^\circ\mathrm{C}$, water at $4^\circ\mathrm{C}$.

Step 1: Iron temperature $T_iron = 40^\circC > T_water = 4^\circ\mathrm{C}$.

Heat flows from higher $T$ to lower $T$.

$(a)$ Flow from iron to water. True

$(b)$ Flow from water to iron. False

$(c)$ Flow from mug to ball or ball to mug. False