Recent content by nathancurtis11

Homework Statement https://www.smartphysics.com/Content/smartPhysics/Media/Images/EM/14/h14_threewires.png Three infinite straight wires are fixed in place and aligned parallel to the z-axis as shown. The wire at (x,y) = (-10 cm, 0) carries current I1 = 2.9 A in the negative z-direction...

I thought since the ball was stationary then the force by the lower ball on the upper ball had to be exactly equal to the force by gravity, therefore would be the gravitational constant of 9.81

so -9.81e-6 N c = ( 9e9 N m^2 / c ^2 (q^2) ) / ( .04m ^ 2) solve for q from there?

-9.81 Newtons.

So would force be -9.81 then?? so -9.81 = (kq1q2) / r ^ 2 ?

Homework Statement Two small .1 gram stryofoam balls are strung like beads on a vertical insulating thread. The lower ball is glued to the thread but the upper ball is free to move. Imagine that both are given an equal amount of negative charge such that the upper ball is suspended about the...

Homework Statement A person with mass m1 = 50 kg stands at the left end of a uniform beam with mass m2 = 95 kg and a length L = 2.4 m. Another person with mass m3 = 60 kg stands on the far right end of the beam and holds a medicine ball with mass m4 = 14 kg (assume that the medicine ball is at...

I'm an idiot and figured this question out the second I hit submit, so nevermind I got it! Not sure how to delete a post or if I just let it go!

Homework Statement Using trigonometry and Fig. 2 in the ballistic pendulum write-up, show that the height h the pendulum rises after capturing the ball is given by: h=R(1-cosθ) Figure two is here: http://imgur.com/W9nvVZT Homework Equations h=R(1-cosθ) The Attempt at a Solution...

Yeah I noticed a stupid algebra error there -_- . I multiplied the .1 to make it so the v2 's would cancel when adding them together so; 8v1 - v2 = 0 (this step is okay right?) v1 + v2 = 8 9v1 = 8 v1 = 8/9 Time = 200 / (8/9) = 225 seconds 240 - 225 = 15 So she...

I did this is this right? ; 80v1 - 10v2 = 0 (multiply both by .1) 8v1 - v2 = 0 v1 + v2 = 8 -7v1 = -8 v1 = 7/8 m/s Time = 200 / (7/8) ≈ 228.57 seconds 240 - 228.57 ≈ 11.43 seconds So she will make it with 11.43 seconds of air left, is that better?

So given this information how do I go about finding v1 and v2? I know that now 80*v1 = 10*v2 given the law of conservation of motion correct? Do I need to find a v1 and a v2 that will satisfy both the v1+v2 = 8 m/s and the 80*v1 = 10 * v2 ??

Homework Statement You have been hired to check the technical correctness of an upcoming sci-fi thriller film. The movie takes place in the space shuttle. In one scene, an astronaut's safety line is damaged while she is on a space walk, so she is no longer connected to the space...