# Search results

1. ### (distance)(speed of light)^2 = speed of time with units

Sorry, I think I made a thread in the wrong section before. I was wondering if anyone thought time could have a speed? If so, what would be its dimensions? I encountered someone who claimed that (distance)(speed of light)^2 = speed of time with units, that would be m^3/s^2 = speed of time...
2. ### Work and coefficient of friction

If you calculate the coefficient of friction that is when it will be its biggest. When you do this, the answer is .16. Therefore, .2 is wrong... It is impossible for it to be .2
3. ### Work and coefficient of friction

Read the entire thread. This question is out of the textbook, but my teacher says that there is an error with the coefficient of friction (which the book claims to be .2). It is obvious that there is an error with the coefficient of friction, but I just don't know how to calculate it. The reason...
4. ### Work and coefficient of friction

It doesn't tell you the acceleration. My teacher challenges that you can still find the coefficient of friction. Knowns: applied force; dimensions of triangle; force of gravity component
5. ### Work and coefficient of friction

I have already stated previously what are givens in the question. There is a box being pushed up an inclined plane by an applied force that is parallel to the horizontal. We are also given the box's mass and the dimensions of the triangle.
6. ### Work and coefficient of friction

Perhaps my teacher is wrong and there is nothing wrong with this question.
7. ### Work and coefficient of friction

A worker pushes a crate weighing 93N up an inclined plane, pushing horizontally parallel to the ground. It then has a digram giving the dimensions of the inclined plane so that an angle can be calculated and work can too. c) THe coefficient of friction is .2. How much work is done by friction...
8. ### Work and coefficient of friction

Homework Statement This is in my work unit. Can someone lead me in the direction of finding the value of the coefficient of friction? What we have is a box being pushed up an incline plane. There is an applied force parallel to the horizontal as well as the force of gravity given. The...
9. ### Equilibrium of reactions - which direction is favored?

That doesn't make sense with the definition then. Because in my textbook it defines that if the equilibrium constant is greater than one, then the forward reaction is favoured. Couldn't your reverse reaction be proceeding faster while having a equilibrium constant greater than one?
10. ### Equilibrium of reactions - which direction is favored?

Thanks, so even if the reverse reaction is proceeding more quickly, the forward can be favoured as depicted by the Keq value > 1?
11. ### Equilibrium of reactions - which direction is favored?

I don't understand what you mean by "excess meaning enough to stop the reaction". I'll try to give you a better example of what I am asking. Say you are given a question and you are told that the equilibrium constant is 4. You are then told to find out if the reaction is in equilibrium, so you...
12. ### Equilibrium of reactions - which direction is favored?

Homework Statement Is it the same to say the products are favour and the forward reaction is favoured. Or can the reverse reaction be favoured but the products be favoured. For example, the equilibrium constant is >1 so by definition the products are favoured, but if a system has excess...
13. ### Circular motion

Fn approaches 0. Thanks.
14. ### Circular motion

Homework Statement A toy with a mass of 100g is going through a loop-the-loop with a diameter of .5m. How fast must the car be moving at the top of the loop in order to not fall. The Attempt at a Solution At the top of the loop, there is a normal force (Fn) and the force of...
15. ### Identities homework problem

Homework Statement I'm on the last section of identities entitled half angle identities. This one seems to give me some trouble because I have never encountered one with a horizontal shift in it. Tips? tan 1/2( ß + π/2 ) = ( 1 + sin ß ) / cos ß
16. ### Free body diagram

Well, in the question it stated that it was accelerating... So was I right to have only the two forces Ft and Fg with Ft bigger?
17. ### Free body diagram

Homework Statement When drawing a freebody diagram for just an elevator, not the people in it, what are all the forces that we have to consider? I just used Fg down and Ft up, but because it is accelerating up, I made Ft greater.
18. ### Motion in 2 Dimensions - Inclined Plane Pulleys

Here, I attached a freebody diagram for the following question given that there is no force of friction due to the emphasis of a smooth surface and no coefficient of friction was given. Can you identify which forces are involved?
19. ### Motion in 2 Dimensions - Inclined Plane Pulleys

Before you approach questions like these, you must have a great understanding of how to draw freebody diagrams. For this question, Fnet = Ft + (-Fg parallel) = ma. If you do not understand where these forces are coming from, let me know and I'll draw you the freebody diagram.
20. ### Motion in 2 Dimensions - Pulleys

Also, I would hope the answer for acceleration is not 1.6 m/s; that is velocity.
21. ### Motion in 2 Dimensions - Pulleys

The acceleration would not be that of gravity, as there are other forces you must take into consideration. Also, there is an acceleration.
22. ### How does the angle at which a ray of light strikes a prism compare with the angle at

Exactly, after light passes through a prism, it deviates from its incident.
23. ### How does -9.2*m/s + 3.6 Kg become 2.6m/s?

Can you post an example..?
24. ### How does the angle at which a ray of light strikes a prism compare with the angle at

When light is passed through a prism, each of the different wavelengths that make up white light refract differently because their indices of refraction of are different. Hence when you pass white light through a prism it is separated into its colours.
25. ### How does the angle at which a ray of light strikes a prism compare with the angle at

Note that the light is not being reflected, rather it is being refracted as it passes through the prism. Google what refraction is, and you should know the answer to your question.
26. ### Photosynthesis - process and variables

Homework Statement I was wondering if there was anybody in here with an understanding of the photosynthesis process? If so, would you be willing to read my description of it and ensure that all information is valid and accurate. Thanks
27. ### Chemistry Chemistry: Moles

1 mol of O2 x 6.0221415 × 10^23 molecules / mol = number of oxygen molecules in a mole
28. ### Determine the normal force of a crate on the floor

Fnet = Fn +Fa - Fg = 0 Fn + 200sin30˚ - (50kg*9.8m/s/s) = 0 Fn + 100N - 490N = 0 Fn - 390N = 0 Fn = 390N .. and that's the answer. Thanks a lot!
29. ### Am I approach this question right? finding acceleration

Perhaps the book is wrong because I attained the same answer without reading the thread until now.
30. ### Determine the normal force of a crate on the floor

Homework Statement A boy pulls a 50kg crate across a level floor with an applied force of 200N. If this applied force is at an angle of 30 degrees with the horizontal and the coefficient of kinetic friction is .3, determine; a) the normal force exerted on the crate by the floor. I...
31. ### Notation for derivatives

So it wouldn't ever matter which one I use? I could use both?
32. ### Leaf Pigments

Since light at the blue end of the spectrum penetrates most easily under water, it is these colours which are being absorbed by the pigments. What we see is the wavelengths that are transmitted or reflected. Therefore, it is the other end of the spectrum which we are seeing (red-yellow.)
33. ### Notation for derivatives

Homework Statement I cannot seem to find my textbook and we just started derivatives. Can anyone tell me when I would use the notation dy/dx as opposed to something like f'(x)?? Thanks!
34. ### Newton's laws and working with systems

4. Given the following system of 50kg carts that accelerate at 3m/s/s with a coefficient of friction of .1 then; []------[]------[]--------> ...^B...^A...^F1 a) find the force that creates the acceleration on the system. (as if it were frictionless) F1=ma =150kg(3m/s/s) =450N b)calculate...
35. ### Newton's laws and working with systems

so when you are solving for the tension in the 2 strings, would one of the equations have m=the systems entire mass, and the other will have m=only 2 blocks?
36. ### Newton's laws and working with systems

I'm not quite sure I understand how to do this.
37. ### Newton's laws and working with systems

I drew one for the entire system
38. ### Newton's laws and working with systems

Homework Statement Say you have three carts connected by strings, with each cart's mass being 50kg, which way would the tension for be pointed in a free body diagram? By the way, the carts are accelerating.. []-[]-[] accelerating --> @ 3m/s/s
39. ### Inclined plane and force of friction

one last question. If I was dealing with a system that contained three blocks attached by a string such as: []-[]-[] and they were accelerating in the right direction, when I am calculating the total frictional force, do I add up all of the normals for the equation Ff=ufn?
40. ### Inclined plane and force of friction

a=0, velocity=constant

net=0
42. ### Inclined plane and force of friction

You slide a 325N trunk up a 20degree inclined plane with constant motion by exerting a force of 211N parallel to the inclined plane. what is the sum of the applied force, friction, and the parallel component to the trunks weight? why? thanks in advanced
43. ### Unit conversions and significant digits

I'll give you an example 10,000 see where the 0 is underlined? Flip it so that line is on top of the 0 instead of on the bottom
44. ### Inclined plane and force of friction

That makes sense. How do we know how many components to use for net force in a given problem? I was making this much more complicated than it is.. This is partially because I am teaching this to myself and I came across one question whcihO involved the sum of the applied force, parallel...
45. ### Unit conversions and significant digits

you can put a line above the last zero that you want to be significant
46. ### Inclined plane and force of friction

Homework Statement I am having some difficulties finding out the force of friction for an inclined plane. If we know the mass of the object, the angle of the inclined plane, and the acceleration, how to we find Ff? I know how to draw the diagrams, but I can't seem to find what force of...
47. ### Explain why this function is discontinuous

nvm, the book must be wrong..
48. ### Explain why this function is discontinuous

Homework Statement Using the test for continuity at a point, explain why each function is discontinuous at the given x-value. Classify each discontinuity. the question is a piecewise function. i(x)={(x^2+5x+4)/(x^3+1), x=/= -1 {2, x=-1 this is all one piece wise function...
49. ### Fnd the limit of sqrt(x^2 + 4x) - x as x goes to infinity

is there any way to tell when you've got a function in indeterminate form before factoring?
50. ### Fnd the limit of sqrt(x^2 + 4x) - x as x goes to infinity

I was taught to plug a zero in wherever x is in the denominator. ie. 4/x = 0 when dealing with limits of infinity