Recent content by PAstudent

Homework Statement Homework Equations (In picture)[/B]The Attempt at a Solution (In picture) [/B]

Homework Statement Homework EquationsThe Attempt at a Solution I had someone help me with this problem (not on here) and their process and units don't seem to match to me. Or is this correct?

1. Homework Statement Homework Equations In picture The Attempt at a Solution Is my setup correct for finding the combined kinetic energy in part a)

1. Homework Statement Homework Equations P=dW/dt The Attempt at a Solution I feel like I did something incorrect because I didn't use the vertical distance at all. If I'm wrong, does it have something to do with the displacement?[/B]

It says explain why Newton's second law and the constant acceleration kinematics equations cannot be used to check for the 50m

The 50m cannot be checked because it has a variable force from 20-50 and no longer a constant acceleration

1. Homework Statement The Attempt at a Solution I was wondering if I did something wrong for the 50m. I did the same process of finding the area under the line. I'm assuming it's possible to get the same speed since the net work is the same.[/B]

The friction force would oppose the direction of the velocity. So it's wrong to have my friction force down the slope of the track?

Is it correct for (a) to solve for the mass and plug that into the other Newton's 2nd law to cancel the mass and normal force

Thank you for the replies

Homework Statement Homework Equations Fnet=m(v^2/R)[/B]The Attempt at a Solution I understood the FBD and how to find the bank angle. I just don't fully understand what part a and b are giving me in terms of friction. So for a, since it is skidding would only kinetic friction be used? Then...

Thank you for all your help

Hopefully this is correct. Sorry to put you through all of that. I just struggle with these type of angle concepts

I get what you are saying about the vertical direction, but I just don't get how that vector wouldn't be in that quadrant