Recent content by BoldKnight399

So i did that using my numbers and I get that the answer is 29.83 which makes absolutely no sense because mew cannot be bigger than 1. Did I do somethign wrong in the calculations: I got that my equations were: r*Fnmewk=1/2mr^2*(w*2pi/t) so mewk=(1/2mr^2*(w*2pi/t))/(r*F) so mew k=29 which...

so then torque=r X (fn*mewk)=I*alpha but then how do I relate omega to alpha? is it alpha=domega/dt?

second law for rotations? torque=rXF? and Oh, fk=fnmewk. but I still don't know where to fit it into the equation/ or is that my F?

A grindstone in the shape of a solid disk with diameter 0.550 m and a mass of m = 50.0 kg is rotating at omega = 840 rev/min. You press an ax against the rim with a normal force of F = 160 N , and the grindstone comes to rest in 7.60 s. Find the coefficient of friction between the ax and the...

A bowling ball weighing 72.0N is attached to the ceiling by a rope of length 3.78 m. the ball is pulled to one side and released; it then swings back and forth as a pendulum. As the rope swings through the vertical, the speed of the bowling abll is 4.00 m/s. What is the acceleration of the...

yeah...I missed the fact that q was on the x axis. makes sense now. Thank you for your help!

Two positive point charges, each of which has a charge of 1.5 × 10−9 C, are located at y = +0.50 m and y = −0.50 m. The Coulomb constant is 8.98755 × 10^9 N · m2/C2. a) Find the magnitude of the resultant elec- trical force on a charge of 1.0×10−9 C located at x = 0.55 m. Answer in units...

Moral of the story: I need to learn to read. Thank you so much!

I tried it and it was wrong. So I guess that I did something wrong. Any ideas?

An electron moving through an electric field experiences an acceleration of 7200 × 10^3 m/s2. Find the magnitude of the electric force acting on the electron. The Coulomb constant is 8.99 × 109 N · m2/C2 and the fundamental charge is 1.60 × 10−19 So I thought that since E*q=F then it...

hmmm good call. Thank you soooooooo much!

you can do that?

x=tan(t)+sec(t) and y=tan(t)-sec(t) I have to take the derivative, but it specifically states that I must eliminate the Parametric to do so (I think as a way to check we can do this...oops) I was thinking that I could turn the x into: x=sint+1/cost and then I could go from there, the only...

ok Thank you!

Integral from o to inf of sin(x/2)dx First thing I did was ditch the infinity so it became: lim as a-->inf of integral from 0 to a of sin(x/2)dx next I integrated it: lim as a approaches infin of -cos(x/2) evaluated from o to a then I plugged in: lima->inf of -2cos(a/2)+2(cos0) My...