Question

Two objects A and B have the same mass and the same specific heat. Object A is heated from 30°C to 70°C and object B is cooled from 70°C to 30°C. How are the thermal energies of the two objects related after the temperature change has occurred?

A. The thermal energy of A is 40 kJ and the thermal energy of B is 30 kJ.
B. The thermal energies of A and B are the same.
C. The thermal energy of B is higher than the thermal energy of A.
D. The thermal energies of A and B have the same magnitude but opposite signs.

Answer 1

@moradi312

Answer 2

D?

Answer 3

@Abhisar

Answer 4

@eric_d

Answer 5

It's D.when their specific heat capacity and their mass is equal their heat capacity is same.
\[C=Q \div \Delta T\] \[Q=\Delta T \times C\]their C is equal and magnitude of temperature change is same but with opposite signs for them and these condition cause D proper choice.

Answer 6

thank you!

Answer 7

you'r welcome.