# Search results

1. ### Magnitude and direction a uniform magnetic field

Thanx I figured it out I was using the right formula and had forgotten that the mass of the proton is 1.67x10^-27 and I was using the charge which was 1.6 x10^-19.. but thank you for the idea on right hand rule that helped with the 2nd part. ash:smile:
2. ### Magnitude and direction a uniform magnetic field

magnetism Hi I'm stuck on this problem I its got to be something simple.Here goes.... A proton moves perpendicularly to a uniform magnetic field B at 1.0x10^7 m/s and exhibits an acceleration of 2.0x10^13m/s^2 in the + x-direction when its velocity is in the + z-direction. Determine the...
3. ### Harmonic wave

so I would use the formula a=Aw^2cos(wt)
4. ### Harmonic wave

ok I need help starting this problem. I always have trouble seeing which formula to use so ant thoughts would be helpful A harmonic wave is traveling along a rope. It is observed that the oscillator that generates the wave completes 40.0 vibrations in 30.0 s. Also, a given maximum travels 425...
5. ### Vibrations and waves

well that is what chapter it is in sry I didn't really know what to put in heading. Thanks though ash
6. ### Vibrations and waves

A 500-g block is released from rest and slides down a frictionless track that begins 2.00 m above the horizontal as shown in the figure. At the bottom of the track, where the surface is horizontal, the block strikes and sticks to a light spring with a constant of 20 N/m.find the maximum distance...
7. ### I have no idea how to start this help

so will the angles made on the triangle be 45degrees? and I use them in my calculations?
8. ### I have no idea how to start this help

A stuntman whose mass is 70 kg swings from the end of a 4.0-m-long rope along the arc of a vertical circle. Assuming he starts from rest when the rope is horizontal, find the tensions on the rope that are required to make him follow his circular path,(a) at the beginning of his motion, (b) at a...
9. ### Can anyone help my start this problem?

:blushing: ooh....thanks for the help :smile:
10. ### Can anyone help my start this problem?

Ac= v^2 / r 12^2 / .100 which I got 1440. and the answer is 14.4
11. ### Can anyone help my start this problem?

A 0.150-m-radius grinding wheel, starting at rest, develops an angular speed of 12.0 rad/s in a time interval of 4.00 s. What is the centripetal acceleration of a point 0.100 m from the center when the wheel is moving at an angular speed of 12.0 rad/s?
12. ### Rolle's Theorem

thanks for the replys I had seen my error after my post I was using the mean value theorem instead of rolles theorem opps:blushing: thanks for the replys though
13. ### Rolle's Theorem

Ok I think I can use Rolles theorem on F(x)=x^2+3x on the inteval [ 0,2] because the derivative can be defined so then I think I use the formula [f(b)-f(a)] / [b-a] to find f'(c), then set f'(c) = F'(x) and solve is this process right?:shy:
14. ### Critical numbers

Thank you I might need more help later :wink:
15. ### Critical numbers

Im supposed to find the critical numbers for the function: F(x)= x^3-12x^2 I think I did it right I just needed some reassurance, I got F'(x)= 3x^2-24 =3x(x-8) =3x=0 and x-8=0 so the critcal numbers are x=0 and x=8 I think:shy: I hope someone can tell me if I did this right...
16. ### First Derivative Test problem

Thank you for your help that made more since than what I got from class :P
17. ### First Derivative Test problem

yes That is what I eventually need, I can usually get the answer after I find f '(x) but the 1+ cos^2x is the part I cant figure out can you help?
18. ### First Derivative Test problem

Hi I need help using the First derivative test on this problem: f(x)= sinx divided by 1 + cos^2x . any help would be awesome.:confused: