Final answer:
The cup of 50°C water has a greater thermal energy than the bathtub of 50°C water.
Step-by-step explanation:
The cup of 50°C water has a greater thermal energy than the bathtub of 50°C water.
Thermal energy is determined by the amount of heat stored in an object, which is calculated using the formula Q = m * c * ΔT, where Q is the heat, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
In this case, assuming that the masses of the cup of water and the bathtub of water are equal, the cup of water will have a higher thermal energy.