Recent content by Stovebolt

That is correct. You are only asked for acceleration (or deceleration in this case), so initial velocity doesn't come into play.

That is correct, nice job.

You're on the right track. There really isn't any other way to do this than to divide the acceleration due to gravity into components - one component in the direction the skier is traveling, the other perpendicular to this. Since there is no friction, you will not need to use the...

Think about the direction of acceleration due to gravity. Compare this to the direction the skier is moving - they are not the same. You will need to take the component of acceleration in his direction.

Good start. The number of protons in a single atom of a given element is equal to the atomic number. If the sample contains no excess charges, you should be able to find the number of electrons based on the number of protons. An elementary charge (the charge of one proton (+) or...

You don't need mass or acceleration in this case - you are already given the force. For this problem, you need to look at the moment (or torque) applied vs. output.

On the first part, correct. Think of it this way - the greater the force pushing down (perpendicular to the object and the surface), the greater the friction - but this force will be proportional to the force trying to cause motion parallel to the surface. If you increase one, the other...

Good ideas, you should be able to get good results with that. You are right, if you are looking for \mu between two surfaces of paper, you need to have motion between only paper surfaces, so you will need to secure the paper to hard, smooth surfaces. One thing to be careful of - you will...

From the looks of the numbers, I'm guessing you averaged the magnitudes of each of the forces? If so, that is not the correct approach. Otherwise it looks like you took the right steps. I highly recommend drawing a diagram of the web, keeping in mind that you are looking for the sum of the...

Not exactly. The point I'm making is that the amount of weight that contributes to the normal force will vary depending on how much overlap you have. If you had only two sheets, you would need nearly full overlap to have the full weight of the top sheet applied to the second sheet. The less...

In your example, the coefficient of friction will not be changing. The coefficient of friction between two surfaces is a constant (provided you are not deforming the surfaces or changing the material properties), but you are correct that there would be less weight (Normal force) and therefore...

A better definition of a Normal force is one that acts perpendicularly to a surface. On a flat surface, an object that is acted upon only by gravity will have a normal force = (mass * gravitational acceleration), as you noted. For an inclined surface, you will need to take only the component...

Very good advice so far, and I'll add one more bit - When you're not sure, ask someone if they know you well enough to give you a reference, rather than asking for a reference directly. This is generally an easier way to ask , as it doesn't put someone in the position where they might feel...

What is the answer supposed to be? The only thing I can see would be that the question is asking for the force due to the pressure from the seawater, which might mean the water only, not the total pressure (which would include atmospheric pressure, as you did above).

I agree with your formulas, but not your answer. Can you show specifically what you did to come up with your answer?