Recent content by Hisui

Homework Statement How fast (in rpm) must a centrifuge rotate if a particle 9.00cm from the axis of rotation is to experience an acceleration of 115,000 g's? Homework Equations Either v=2(pi)r/T or v=(square root)(ar) ...not knowing which of these to use is possibly my first problem...

Excellent. Many thanks.

Homework Statement A ball at the end of a string is revolved at a uniform rate in a vertical circle of radius 72cm. If its speed is 4m/s and its mass is 0.300kg, calculate the tentsion in the string when the ball is (a) at the top of its path and (b) at the bottom of its path. Homework...

Oh, right. Got it, thank you!

[SOLVED] Force on a slope "Franz is skiing in the Alps. He is racing down a steep slope of 50.0 degrees. For waxed skis on snow, we have mu sub k (for kinetic friction)=0.05. What is his acceleration?" I'm so confused... don't I need his mass to even begin to approach this or am I missing...

Oh, yeah I guess I was over-thinking it. Thanks!

Homework Statement "During the launch, a rocket is accelerated with 20.0m/s^2 upward. A 105.0kg astronaut is more concerned about his weight than about his safety and is standing on a scale. What is the scale reading in kg?" Homework Equations F=ma and also 4.45N=1lb The Attempt...

[SOLVED] Reading Acceleration in V vs. T Graph So, I figured the answer to my own question, but I'm not sure how to delete my own post... sorry guys...