# Recent content by jwxie

1. ### Coefficent of friction for a box moving at cosntant speed

a = 0? so it means they are the same force?? So it means all we need is to use the Ff equation now.
2. ### Coefficent of friction for a box moving at cosntant speed

Homework Statement A horizontal force fo 190N is needed to pull a 70kg box across a horizontal floor at a constant speed. What is the coefficent of friction between the box and the floor? Homework Equations Fnet = ma The Attempt at a Solution My setup is F - F_f = m*a But I...
3. ### Find the final temperature of water

Thanks. But if all Qs are negative, unknown delta T is x = 13.6575 It is still above the boiling point though. I thought it was safe to assume that it is no longer steam, but water, fully in liquid form.\\ Here is my setup -423000 = (-2260 * 175g) + (-2.0 * 50 *175) + (-4.184 * 175 * x) x =...
4. ### Find the final temperature of water

Homework Statement What is the final temperature of water if 175 g steam at 150 C loses 423 KJ of energy? Homework Equations Q = M *C_p * Δ T Q = m * heat of (phase_change) The Attempt at a Solution This is how I would go about solving this problem. Going from steam to water requires...
5. ### Prove absorption law

Homework Statement Prove the absorption law A U (A and B) = A Homework Equations The Attempt at a Solution I need to prove the sets are equal. I don't know how to prove the right hand as a subset of the left hand. For left hand as subset of right hand, it's pretty simple (we can define...
6. ### Computer Engineering Vs Computer Science

I can't believe that when I find this thread through Google someone has made new response. I actually need to decide between CpE and CS, since I am a raising Junior. I used to think that CpE will give you the a very good overview of how digital system operate, and it was the reason that put me...
7. ### GPA: Can you be too perfect?

Good point. Social norm. But does your statement imply that you would in a room for 18 hours 7 days a week?
8. ### Schools Does anyone know which college math course uses conics the most?

Conic... as you've mentioned: parabola. I think you have learned about parabola in high school. Maybe not every property because the main purpose of high school education is to provide a general overview of mathematics to the students, so proofs and stating every property may not be all that...
9. ### GPA: Can you be too perfect?

Your username fits this... viscosity. Haha. Yeah. Grade inflation is a common problem, but as long as you have a high, consistent GPA....
10. ### Learning Python

I don't have any experiences with either book. IMO you should always start with C++. It's just a personal view that it is better to attack the common programming stuff and then go to a more laid-back rapid development type programming language (Python can be quite weird to an experienced...
11. ### GRE Vocabulary List Helpful?

I see. But from what I understand if you can't do well on your general even with excellent scores on your subject your chance will be a lot lower...
12. ### What are your feelings about long gaps between classes & waiting on campus

I second this. 10 hours of gap. Definitely get an on-campus job.... at least take out 3 hours.
13. ### How can I maintain my motivation to solve problems?

Man. Stop picking on my poor performance :[ . I know. It's an effort. :tongue:
14. ### How can I maintain my motivation to solve problems?

Interesting suggestion. This can really lead to a good result. If you arrange a study group with the classmates / friends, it is your responsibility to do the homework ASAP, and expect to help each other out. The chatting part can consume time, and should avoid as much as possible. But if you...