hmm so far..
m= mass of box and M=mass of cart. I assume the acceleration of the box and cart is the same.
F(box)=force(friction)=umg=ma
ug=a
F(cart)=force done by you=Ma
Substitute ug=a into the equation.
u*g*M=Force so mass of the box doesn't matter?
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/d77fab7d-ece6-4c9c-be65-bf41f94770fd
Homework Equations
I got the right answers doing the work shown, but I don't understand the logic of how I solved question 4.
The Attempt at a Solution
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/9582a1aa-b21a-4e50-8774-b60866a7d666
Homework Equations
lambda=h/p
The Attempt at a Solution
So I got 4.04E-12 m but the book says the answer is 3.23pm
I'm not sure where I'm wrong
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/23298f1b-2ef4-4cdf-8b7a-58c9be07335a
Homework Equations
E=hf
The Attempt at a Solution
I'm not even sure how to get the distance for this problem.
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/6596c399-feb6-49cf-82a7-d6d16c2a88e8
Question 17
Homework Equations
So I solved this problem using kinematics and would like to learn how to solve it use conservation of energy. I can't seem to get the right...
http://www.screencast.com/users/trinhn812/folders/Jing/media/07c73e88-45a9-4703-91e1-237b20135d2c
I'm not sure why the answer is A. I tried reasoning myself that it has to do with the critical angle, but I can't seem to convince myself.
I'm still a bit confused as to why the dot like patterns are horizontal. What is the black dot? Is that suppose to indicate a circular single slit?
In the following picture, I'm confused as to how the picture on the left translate to the one on the right. As the diffraction pattern on the left...
I'm just having a horrendous time trying to figure this problem out. My geometry is really lacking.
http://www.screencast.com/users/trinhn812/folders/Jing/media/64c9342a-985a-4bb2-9e29- [Broken]
98b5b5ebb1ad
I believe so. The wavelets due to huygen's principle can still propagate at the edges of the hair. Do the wavelets propagate horizontally around the vertical hair? It just confuses because single slit oriented vertically produce vertical patterns. But hair doesn't and I am told it acts similar...
http://www.screencast.com/users/trinhn812/folders/Jing/media/9527c4fa-05b4-4baa-98ee-2a3ad47e7e5a
I need an explanation for question 6. Why would voltage stay the same across capacitor 3?
The dielectric increases capacitance which is inversely related to voltage correct? The equation...
Homework Statement
http://screencast.com/t/ZTk3NDUxNjU
I need help with understanding number 18.
Homework Equations
Center of mase formula: m1x1+m2x2/(all masses)
The Attempt at a Solution
How do you tell if adding the weight will make the truck tipover.
I calculated that...
Homework Statement
Now two fluids are placed in the same tube (d). Both sides are open to the atmosphere without pistons. One fluid is water and the other (on top of the water in the left branch of the tube) is an oil of unknown density. l = 135mm and d = 12.3mm. What is the density of the...
Homework Statement
Compare impulse for the two objects
http://www.screencast.com/users/trinhn812/folders/Jing/media/ecf05e80-8fa7-435c-bfa0-891cf13b176a
Homework Equations
Change in impulse equation
The Attempt at a Solution
When you calculate impulse do you have to find the...
Homework Statement
http://www.screencast.com/users/ntrinh3/folders/Jing/media/a4165a56-de0d-4a4a-a01e-49242fd505c4
Need help with question 13
Homework Equations
Conservation of energy and momentum occurs in elastic collision
The Attempt at a Solution
Why would the block 2 have an...
oh so that's it.
How about if they just give you the x-coordinate in a system? exe:
http://www.screencast.com/users/ntrinh3/folders/Jing/media/010db89d-7781-4262-aa79-57eaf706730f
do you just add all of the x-coordinates and divide by how many points?
Homework Statement
I'm confused about how to find the center of mass
http://www.screencast.com/users/ntrinh3/folders/Jing/media/a9773d23-38f1-4d28-a6f8-3b681d42d4c2
and
http://www.screencast.com/users/ntrinh3/folders/Jing/media/bfb40c40-0068-41e8-ac83-2146e1df3330
Homework...
Homework Statement
http://www.screencast.com/users/ntrinh3/folders/Jing/media/7b6a2810-2827-44c3-adfc-cd27d564b812
Homework Equations
Wnet=change in KE
The Attempt at a Solution
so I made the coordinate with x positive in right direction and y is positive up.
Fdcos30-mgh=.5mv^2...
When a car brakes, isn't it in motion and using kinetic friction to stop, and not static friction?
Static friction causes rolling motion in wheels, but there is no rolling motion so it skids. So shouldn't kinetic friction do work and not static? I'm a bit confused on the two concept.
Homework Statement
Which forces does work?
http://www.screencast.com/users/ntrinh3/folders/Jing/media/3f09a85d-142c-4f73-a8a8-1ad506d5c2b8
Homework Equations
W=fdcos(theta)
The Attempt at a Solution
I always thought normal and friction does no work because it is perpendicular to...
1. Homework Statement
http://i43.tinypic.com/i1bq1i.jpg
I need help with number 9
2. Homework Equations
Wnet=change in KE
Wnc=Change in Energy
The Attempt at a Solution
so I'm assuming the energy dissipated means the work done by friction?
so work of friction is umgcos(15)*d...
sorry I meant that F(k) which is the force due to kinetic friction.
The equation for work is FDcos(theta). They gave use the height so I calculated the distance of the slope by Pythagorean theorem which gives cos(15)*the height.