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Tutor profile: Zach D.

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Zach D.
Physics/AP Physics Teacher, 7 Years Teaching Experience
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Questions

Subject: Chemistry

TutorMe
Question:

How does the kinetic molecular theory work to explain why pressure increases as temperature increases? What's a real world example of this?

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Zach D.
Answer:

The atoms in a material are always vibrating. They move faster as they gain more heat energy and slower as they lose heat energy. But as they move faster with more heat they bump into each other more and create more space between the atoms. This is when states can change for the substance but this is also when pressure would increase because the atoms are hitting against the sides of the container more and more frequently. A real world example of this would be if I were to open my radiator cap in my engine after running for a while. The coolant would be hot and the atoms inside moving very quickly. The pressure would build inside the radiator and if I were to open the cap the liquid would burst out.

Subject: Physics

TutorMe
Question:

Newton's 1st law can be found anywhere in our lives. Give an example of N1L and identify where inertia plays a role.

Inactive
Zach D.
Answer:

Newton's 1st law states that objects in motion stay in motion/objects at rest stay at rest. The more inertia an object has the more it "follows" N1L. For example, my backpack with few books in it would have small inertia and would not move unless I picked it up and applied a force to it. But if my backpack was filled with textbooks it would have more inertia and would "resist" moving more than before and would require more force to move. The same would be seen if my backpack was in motion on a slippery surface (like ice). If my light backpack was moving at a constant velocity on ice it would not take much force to stop it from moving because it has a small inertia. Inversely, my heavy backpack would want to continue sliding on the ice and would require more force to stop moving because it has more inertia.

Subject: Physical Science

TutorMe
Question:

In what ways can a system have all three kinds of heat transfer? Give a real world example.

Inactive
Zach D.
Answer:

Conduction - heat moving through difference in densities from hot and cold fluids/gases, Conduction - heat transfer through contact, Radiation - heat transfer though light/radioactivity. All three could be found in a campfire, where hot air would rise above the fire, things that directly touch the fire/coals would become hot, the electromagnetic radiation given off by the flames also transferring heat.

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