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Tutor profile: Curtis W.

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Curtis W.
Student at University of Washington
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Questions

Subject: Physics (Newtonian Mechanics)

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Question:

Why does centripetal force point inwards? When I am turning a sharp curve in my car, I feel myself getting pushed outwards. So shouldn't centripetal force points outwards?

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Curtis W.
Answer:

What you are feeling is the car door exerting an inward force on you. Centripetal force must point inwards because your change in velocity points inwards.

Subject: Physics (Electricity and Magnetism)

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Question:

I have a capacitor in series with a resistor in a circuit powered by a 5V battery. What is the current running through the circuit?

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Curtis W.
Answer:

There is zero current in this circuit because in a purely DC circuit, a capacitor essentially acts as an open wire, so no current will flow through the capacitor. This means that the voltage drop across the resistor is zero (V=IR and I=0) so then the voltage across the capacitor must be 5V in order to satisfy Kirchhoffs Loops Rule.

Subject: Nuclear Physics

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Question:

If protons are positively charged, how are they held together in the nucleus? wouldn't they repel each other away?

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Curtis W.
Answer:

Protons are held together by a force known as the strong nuclear force, which is much greater in magnitude then the electromagnetic force that repels them away.

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