Recent content by Alice7979

Homework Statement lim (1/x - 1/3) / (x-3) x->3 Homework EquationsThe Attempt at a Solution I tried to cancel the bottom (x-3) out by multiplying the top by 3/3 and x/x and then got ((3-x)/3x)/(x-3) but ended with 0/0 and the right answer is -1/9. The top part is confusing me.

(9.11E-31)(1.60E-19)(.3)/(1.60E-19)(1.673e-27) =1.6E-4 I got it right but the homework program doesn't work that well so I didn't really get it right had to have 3 sig figs :( Thank you though

Yea, I wasn't sure if my work was right F=qvB ----> F= (1.60E-19)v(.30) I don't know if I should try to find v and I don't remember how but if qB=mv/r, can I solve for v/r and do it that way?

Thank you

ELECTRON: 9.11E-31(v^2/r) = (-1.60E-19)(B)(v) PROTON: 1.673E-27(v^2/r) = (1.60E-19)(.3)(v) 9.11E-31(v^2/r) / (-1.60E-19)(B)(v) = 1.673E-27(v^2/r) / (1.60E-19)(.3)(v) Belectron: -1.6E-4

Homework Statement A proton is projected perpendicularly into a magnetic field that has a magnitude of 0.30 T. The field is then adjusted so that an electron will follow a circular path of the same radius when it is projected perpendicularly into the field with the same velocity that the proton...

Homework Statement One component of a magnetic field has a magnitude of 0.0431 T and points along the +x axis, while the other component has a magnitude of 0.0686 T and points along the -y axis. A particle carrying a charge of +1.70 × 10-5 C is moving along the +z axis at a speed of 4.24 × 103...

It was supposed to be V/2

Homework Statement A battery has an emf of V and an internal resistance of r. What resistance R, when connected across the terminals of this battery, will cause the terminal voltage of the battery to be ? A. r= R B. R= 4r C. R= r/4 Homework Equations V=IRThe Attempt at a Solution Req= r+R =...

I got it, the answer was supposed to be in scientific notation

I entered .001 s and I still have it wrong

*Vo cancel out* 1/2= sin(406.5t) 1/2= sin(.523599) t=406.5/.523599 = .0012880664 s

Never mind, I angular velocity=2pif

How do you know its in radians?

Homework Statement According to Equation 20.7, an ac voltage V is given as a function of time t by V = Vo sin 2ft, where Vo is the peak voltage and f is the frequency (in hertz). For a frequency of 64.7 Hz, what is the smallest value of the time at which the voltage equals one-half of the...