# Physical Science

## Chapter 6: Thermal Energy

### Solve a Simple Equation

 1. Find the change in thermal energy of a 20-kg wooden chair that warms from 15º to 30º if the specific heat of wood is 700 J/(kgº). A) 140,000 J B) 210,000 J C) 490,000 J D) 1,090,800 J 2. Find the change in thermal energy of a 20-kg wooden chair that warms from 20º to 55º if the specific heat of wood is 700 J/(kgº). A) 140,000 J B) 210,000 J C) 490,000 J D) 1,090,800 J 3. Find the change in thermal energy of a 20-kg wooden chair that warms from 15º to 20º if the specific heat of wood is 700 J/(kgº). A) 28,000 J B) 210,000 J C) 140,000 J D) 490,000 J 4. Find the change in thermal energy of a 20-kg wooden chair that warms from 25º to 35º if the specific heat of wood is 700 J/(kgº). A) 140,000 J B) 210,000 J C) 363,600 J D) 490,000 J 5. Find the change in thermal energy of a 20-kg wooden chair that warms from 30º to 45º if the specific heat of wood is 700 J/(kgº). A) 140,000 J B) 210,000 J C) 490,000 J D) 1,090,800 J 6. The air in a living room has a mass of 72 kg and a specific heat of 1010 J/(kgº). What is the change in thermal energy of the air when it warms from 15º to 30º? A) 140,000 J B) 210,000 J C) 490,000 J D) 1,090,800 J 7. The air in a living room has a mass of 72 kg and a specific heat of 1010 J/(kgº). What is the change in thermal energy of the air when it warms from 20º to 55º? A) 210,000 J B) 490,000 J C) 1,090,800 J D) 2,545,200 J 8. The air in a living room has a mass of 72 kg and a specific heat of 1010 J/(kgº). What is the change in thermal energy of the air when it warms from 15º to 20º? A) 140,000 J B) 210,000 J C) 363,600 J D) 1,090,800 J 9. The air in a living room has a mass of 72 kg and a specific heat of 1010 J/(kgº). What is the change in thermal energy of the air when it warms from 25º to 35º? A) 140,000 J B) 210,000 J C) 363,600 J D) 727,200 J 10. The air in a living room has a mass of 72 kg and a specific heat of 1010 J/(kgº). What is the change in thermal energy of the air when it warms from 30º to 45º? A) 1,090,800 J B) 490,000 J C) 210,000 J D) 140,000 J