A 40-gallon gas water heater can recover in about an hour. But a Recovery for a 40-gallon electric water heater takes about two hours.But I'm not so sure about a water tank
An old sandwich rotting in a trashcan and building a tower out of magnetic blocks both are undergoing chemical changes.
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What are chemical changes?</h3>
Chemical changes are said to occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
Examples of chemical changes include burning of wood, cooking of pasta, rusting of metal , and rotting of sandwiches.
In conclusion, chemical changes involve the formation of new substances while Physical change is a temporary change.
Learn more about chemical change at: brainly.com/question/19794032
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Answer:
The second arrow from the top to the bottom
Explanation:
This can be explained by the Newton's third law.
For every action there is an equal and opposite reaction.
When an object A exert a force to an object B. Then object B also excerts a force with the same size but opposite direction to object A.