Question

the surface of a heated metal object measures 120°c. it is dropped into a bucket filled with water measuring 10°c. which is most likely to occur in an hour?
water temp is the same light blue
metal temp increases pink
equilibrium is reached yellow
10
the warmth you feel holding a warm cup of cocoa is an example of
conduction pink
convection light green
radiation dark green

Explanation:

• For the first part (metal - water interaction):
• Heat transfer occurs from the hotter object (metal at \(120^{\circ}C\)) to the cooler object (water at \(10^{\circ}C\)).
• According to the principle of heat transfer, when two objects are in thermal contact, heat flows until thermal equilibrium is reached.
• For the second part (warm cup of cocoa):
• Conduction is the transfer of heat through direct contact. When you hold a warm cup of cocoa, heat is transferred from the cup (in contact with your hand) to your hand.
• Convection involves the transfer of heat through the movement of fluids (liquids or gases).
• Radiation is the transfer of heat in the form of electromagnetic waves (no medium required).

Answer:

• First part: equilibrium is reached (YELLOW)
• Second part: conduction (PINK)