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 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
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/cdd8b2f4-1c0d-43ba-8722-fb8b811c5585
Homework Equations
V=IR
V(C)=X(C)*R
The Attempt at a Solution
I'm having trouble with number two. I tried finding Z from the frequency and then calculating the...
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/8fe997e1-46e5-4033-a246-fbad0acb7162
Homework Equations
The Attempt at a Solution
I understand that in question 25, the conductor becomes polarized and its negative charges will be more attracted...
http://www.screencast.com/users/trinhn812/folders/Jing/media/3bedaa97-7020-4c5b-85d8-213de24b30a5
For the above problem. A helpful yahoo user told me that I can prove the answer for the above question by solving the problem. He said:
Total current is 9/6.2 = 1.45 amps.
that all flows thru the...
http://www.screencast.com/users/trinhn812/folders/Jing/media/de5edaba-e848-47f5-82b9-bd770b216e95
I need help with Question 27 specifically. The correct answer is A, but I don't understand why.
I thought it would be B according to Korkoff's Loop rule of the inner left loop, where current...
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...
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...
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...
Homework Statement
http://i43.tinypic.com/i1bq1i.jpg
I need help with number 9
Homework Equations
Wnet=change in KE
Wnc=Change in Energy
The Attempt at a Solution
I haven't been able to get the answer marked by the computer.
I tried Fs(h*cos15)=.5mv^2-mgh
and that is way off...
Homework Statement
http://i43.tinypic.com/352nlw2.jpg
I need help with the question 25. The three star (hardest) problem.
Homework Equations
well conservation of energy is
Mgh=.5Mv^2+.5Mv^2+.5(.5MR^2) ω^2
The Attempt at a Solution
Wouldn't increasing the Radius increase the...
http://www.screencast.com/users/trinhn812/folders/Jing/media/5c3b51ea-aed8-4321-964c-126b49a3c1dc
F/m = 0.3m/s^2
distance in x direction= 1/2(a)(T^2)
By placing v(y) =0 and v(initial)=100 I found the time to be 20 sec.
But my answer is 60m. So 1020-60=960m
Wouldn't the ball misss the...
http://www.screencast.com/users/trinhn812/folders/Jing/media/bf95a29f-4bb7-4f18-8d2b-f0b90dc3af51
I'm not sure how KE would increase when the initial speed is still the same.
Homework Statement
http://www.screencast.com/users/trinhn812/folders/Jing/media/e79a7b88-f71e-4790-a35c-7bc0c3e03ec8
Answer key is marked
Homework Equations
F=gMm/r^2 =ma=mv^2/R
The Attempt at a Solution
So does gMm/r^2 also measure centripetal acceleration?
Physic:Calculating mass of one rail car?
http://www.screencast.com/users/trinhn812/folders/Jing/media/0852e68e-acef-49b1-a54d-39289386b978
I'm confused. Why isn't it 10000N/10car=1000N*1m/s^2=1000kg
Isn't the force The force exerted on the 11th car is moving 10 cars, not just one.
Homework Statement
So finals is coming up and I was reviewing my notes, when I read that according to Netwon's Third Law gravitational forces (Fg) should be equal between to objects like the sun and the Earth. So if the sun and earth have the same Fg toward each other, why doesn't the sun...
Homework Statement
A mass attached by a light spring to the ceiling of an elevator oscillates vertically while the elevator ascends with constant acceleration. Is the period greater than, less than, or the same as when the elevator is at rest
Homework Equations
T=2pi * sqrt(m/k)
The...
Homework Statement
A mass oscillating on a given spring has a period of 2s. The spring is now stretched to have an oscillation amplitude that is twice its original amplitude. Which of the following is true?
A The period is 0.5 s.
B The period is 1 s.
C The period is 2 s.
D The...
Homework Statement
So I'm confused about work and constant velocity. In a sailboat example, if the boat is going at constant velocity then there is no acceleration, therefore no net Force and no work.
However, let's say there is an elevator being pulled upward by a pulley at constant...