Question

question 16
an example of a renewable resource is (choose all that apply):
sunlight
natural gas
wild animals
petroleum
wind

question 17
when a thermal system changes, heat stays stored inside the system.
true
false

question 18
an example of chemical energy is:
a rollercoaster sitting on the top of a hill
the unbalanced forces of electrons and protons
electromagnetic radiation from the sun
energy stored in wood

Explanation:

Analyze Question 16

This question asks to identify renewable resources. A renewable resource is naturally replenished on a human timescale.

• Sunlight is continuously available and inexhaustible.
• Natural gas is a fossil fuel, which is non-renewable.
• Wild animals are living populations that can reproduce and replenish, making them renewable if managed sustainably.
• Petroleum is a fossil fuel, which is non-renewable.
• Wind is caused by atmospheric pressure differences driven by solar energy, making it inexhaustible and renewable.

Analyze Question 17

This question asks whether heat stays stored inside a thermal system when it changes.

• Heat is defined as energy in transit between systems due to a temperature difference.
• Systems store Thermal Energy (internal energy), not "heat" itself.
• Therefore, the statement is false.

Analyze Question 18

This question asks for an example of chemical energy. Chemical energy is energy stored in the chemical bonds of substances.

• A rollercoaster on a hill represents gravitational potential energy.
• Unbalanced forces of electrons and protons represent electrical/electrostatic energy.
• Electromagnetic radiation from the sun represents radiant/light energy.
• Wood stores energy in its organic chemical bonds (cellulose, lignin) which is released during combustion. Thus, energy stored in wood is chemical energy.

Answer:

Question 16

• sunlight (Correct answer)
• natural gas
• wild animals (Correct answer)
• petroleum
• wind (Correct answer)

Question 17

• True
• False (Correct answer)

Question 18

• a rollercoaster sitting on the top of a hill
• the unbalanced forces of electrons and protons
• electromagnetic radiation from the sun
• energy stored in wood (Correct answer)