Question

question 5 of 10 which object has the most thermal energy? a. a 10 kg rock at 10°c b. a 6 kg rock at 15°c c. a 10 kg rock at 15°c d. a 6 kg rock at 10°c

Explanation:

Step1: Recall thermal - energy formula

Thermal energy $Q = mc\Delta T$. Assuming the specific - heat capacity $c$ is the same for the rocks (since they are of the same material), and $\Delta T$ is not relevant as we are comparing at given temperatures, thermal energy is proportional to mass and temperature. Higher mass and higher temperature mean more thermal energy.

Step2: Compare the options

Option A has a mass of 10 kg and a temperature of 10°C. Option B has a mass of 6 kg and a temperature of 15°C. Option C has a mass of 10 kg and a temperature of 15°C. Option D has a mass of 6 kg and a temperature of 10°C. Comparing mass and temperature, the object with the highest mass and highest temperature will have the most thermal energy. Among the options, the 10 - kg rock at 15°C (Option C) has both a relatively high mass and a relatively high temperature.

Answer:

C. A 10 kg rock at 15°C