# Search results

1. ### [Quantum Mechanics]Uncertainty principle

I have a question for Heisenberg's uncertainty principle. Here is the question: You are driving your car when you race thru a stop sign and get subsequently pulled over. The cop measured your speed within a meter of the stop sign. You decide to use the uncertainty principle as your defense...
2. ### A question in Kepler's second and third laws.

pervect, how would you prove that mathematically rather than verbally saying it? Is there any equation that would justify your statement? I am not a physics person so I don't really know what you are saying until I see mathematical equations that could clarify my understanding.
3. ### A question in Kepler's second and third laws.

Ok, here are my final questions after perusing over your replies. 1.How do we deduce that (1/2)h is in fact constant? I know that angular momentum has to be constant but HOW DO WE PROVE IT? 2.in a part where I have to show that h^2/(GM) = ed = b^2/a, I found out that e and d were...
4. ### A question in Kepler's second and third laws.

This is actually a math project. Can you prove the above in mathematical temrs? i don't know if you understand what i am saying.
5. ### A question in Kepler's second and third laws.

thank you very much. ill look over and see if i understand
6. ### A question in Kepler's second and third laws.

I am doing this project on kepler's law and can't figure out something. part a (in the process of proving kepler's second law)of this is to show that h = |r|^2(d(theta)/dt) k when r = (|r|cos(theta))i + (|r|sin(theta))j and h = r x r' = r x v. I showed it by taking derivative of r and cross...
7. ### Ap Physics Question.

I TRULY APPRECIATE YOUR HELP ALONG THE WAY. EVERYONE OF US WHO GETS HELP FROM YOU ARE GRATEFUL TO YOU! THANK YOU SO SO SO SO SO MUCH!
8. ### Ap Physics Question.

Thank you again for your advice. I have found part (b) but i really can't solve part (c) and (d). Can you please explain the answer in detail? Meanwhile here is part (b) (b) a(tan) = (dv)/(dt) = r*(dw)/(dt) = r*alpha. a(tanA) = a(tanB) R*alpha = (2R)*alpha(B) alpha(b) =...
9. ### Ap Physics Question.

Than you so much. Here is what I have so far after getting your advice. (a) Moment of Inertia of a disk is equal to I = (MR^2) / 2. So, I(B) = (1/2) (M)(2R)^2 = 2MR^2. Therefore, the answer is 2MR^2. (b) Since the disks are connected by a chain, they have the same angular acceleration...
10. ### Ap Physics Question.

i tried but it does not work..ok i will explain instead in the first picture for question part (a) only, there are two regular circles. circle A has a radius of R and circle B has a radius 2R. They have the same mass and are indeendent of each other. in the second picture which will be used...

12. ### Ap Physics Question.

Hi, thank you so much for making this kind of post for students like me. I have tried the quesotins but i want to make sure that i was right. if worng, please correct me. THANK YOU SO MUCH. Also i had attached pictures of the question to give you enough information. PLEASE REFER TO THE PICTURE...
13. ### Max Vol. Q.

"Hi, I have a question on max vol. q. Its invloved with multivariable calculus. Q) Find the volume of the largest rectangular box with edges parallel to the axes that can be inscribed in the ellipsoid 9x^2+36y^2 + 4z^2 = 36. What i did was i found the three x,y and z-intersection points...
14. ### Multivariable Question.

Hi, I had problem solving one question. Please help me. I included my answers. Please check to make sure that my way is right. 1. IF f(x,y) = x^2 +4y^2, find the gradient vector f(2,1) and use it to find the tanenet line to the level curve f(x,y) = 8 in the xy-plane at the point (2,1)...
15. ### AP Physics questions Help

HOW ABOUT OTHER PROBLEMS? DID YOU JUST IGNORE OTHER QUESTIONS? AND THE HEIGHT IS NOT GIVEN. WE HAVE TO BE ABLE TO SOLVE IT WITHOUT THE INFORMATION ABOUT THE HEIGHT. PLEASE OTHER PEOPLE HLEP ME.
16. ### Potential Energy, Conservation of Energy problem

Hi, I need an explanation for the following question. I also wrote down my answer. TELL me what you think and give me clues to solve this question. There is a picture of two tracks(lines) that are horizontal and parallel to each other. In the middle of tracks, both have "bumps," Track A has...
17. ### AP Physics questions Help

Hi, I need help with my AP Physics questions. I tried all the problems and was unsure of my ways to approach the problems. If you can correct my errors, I would greatly appreciate your help. Thank you! Please answer each question and tell me whether it is right and show me how to do it and...
18. ### This question. Calculus

Yes, i found the equation k(t) = (absolute value of r'(t) X r''(t)) / absolute value of r'(t) to the three. I found the k(t) to be 1/2. I really can't solove number 2 using your explanation. You just defined what the osculating cirlce is. I realize that the raidus is reciprocal of teh...
19. ### This question. Calculus

Hey, I need your help doing some of math problems. Q) A particle's position at time t is determined by the equation of the helix r(t) = < cost, sint, t> Let P be a point with a coordinates (0,1,pie/2). 1. Find the curvature k(t) at any time t. 2. Find...
20. ### Multivariable Calculus Question

Hey, I need your help doing some of math problems. Q) A particle's position at time t is determined by the equation of the helix r(t) = < cost, sint, t> Let P be a point with a coordinates (0,1,pie/2). 1. Find the curvature k(t) at any time t. 2. Find...
21. ### Lab reasoning in conclusion. how and why did i get such error? or difference?

Also i did a calculatio using your method. I still get the exactly same number. It doesn't really make a difference if you use such calculators as texas instrument TI-83 Plus or TI-89. What else can be errors?
22. ### Lab reasoning in conclusion. how and why did i get such error? or difference?

The experiment consisted of two parts and the results are clearly stated in the calculation part. And without the velocity and time you can stil figure out net force by using f = ma and f = mgsin(angle). Is there any problem with this equation? Here is my conclusion so far. You will understand...
23. ### Lab reasoning in conclusion. how and why did i get such error? or difference?

I wrote a lab report for my physics class and i can't finish my conclusion. In conclusion, I have to write why the results i got was so off and so far i have only two weak reasonings. If any of you can see better or more reasonings, please leave me a comment and elaborate a little bit if you...
24. ### Lab/ Help me reason why the error?

I wrote a lab report for my physics class and i can't finish my conclusion. In conclusion, I have to write why the results i got was so off and so far i have only two weak reasonings. If any of you can see better or more reasonings, please leave me a comment and elaborate a little bit if you...
25. ### Two blocks with masses of 4kg and 8kg

Two blocks with masses of 4kg and 8kg are connected by a string and slide down a 30 degree inclined plane. The coefficient of kinetic friction between 4kg block and the plane is 0.2; that between 8kg block and the palne is 0.35. A) calculate the acceleration of each block. b) calculate teh...
26. ### Determine the vehicle speed for which this curve is appropriate

Here is the question: Q. A highway curve that has a radius of curvature of 100m is banked at an angle of 15 degree. a) Determine the vehicle speed for which this curve is appropriate if there is no friction between the road and the tires of the vehicle. On a dry day when friction is...