Grade 12 Physics Problem

[Vortrex]

Okay so I am doing my homework and here is the basics of the problem....

A mass of 5 kg is swung in a vertical circle on a rope with a radius of 10 m.

We have to figure out what the minimal frequency is if we want to keep it just barely spinning

and

We have to find the maximum tension

I have no idea what I am doing so if any of you could post a solution with the work showing me how to do it, it will greatly help me work on my physics homework,

Thanks,

Vortrex

[Kratos]

SEX!?

[People]

DRUGS?!?!?!

[Kratos]

VIDEOTAPE?!?!

But seriously, do your own fuckin' homework.

I hate faggots like you who sign up for one day and never log in the next and beyond.

[Vortrex]

....I've been here for a couple months now just dont come to this section much, hell I was on original totse for a time. I'm not exactly "a faggot who signs up for one day"

[Anima Mundi]

....I've been here for a couple months now just dont come to this section much, hell I was on original totse for a time. I'm not exactly "a faggot who signs up for one day"

He signed up for a single day. He was never on Totse. Flame him.
PS- gatdamn mudfarmer

[The Jitterskull]

Okay so I am doing my homework and here is the basics of the problem....

A mass of 5 kg is swung in a vertical circle on a rope with a radius of 10 m.

We have to figure out what the minimal frequency is if we want to keep it just barely spinning

and

We have to find the maximum tension

I have no idea what I am doing so if any of you could post a solution with the work showing me how to do it, it will greatly help me work on my physics homework,

Thanks,

Vortrex

Find the centrifugal force, the tension on the wire pulling it in towards the center and then isolate for the perpendicular velocity needed relative to frequency (re arrange that).

Hopefully that gets you on the right track. Write out all your equations for EVERYTHING and solve by variables only.

[Mantikore]

http://www.physicsforums.com/archive/index.php/t-34917.html

[Stock Market Anomalies]

....I've been here for a couple months now just dont come to this section much, hell I was on original totse for a time. I'm not exactly "a faggot who signs up for one day"

Doesn't matter, they're probably just being cunts because they never made it to grade 12 but neither did I so I can't really help you all I can say is don't do drugs and get laid while you can.

[dysik]

CENTRIPETAL FORCE! centrifugal is not real.

Fc = (mv^2)/r


A) for the minimum frequency, the Fc will be equal to the weight of the mass at the top, therefor the net force at the top being 0.

Fc = Mg = 5 x 9.8 = 49N

49 = (5 x v^2)/10 (from above equation)
now solve for v

now that you know v, find the circumference of the circle and then find frequencey, too simple to bother explaining.

B) ok so maximum tension is going to be at the bottom, when weight and centripetal force are aligned. ie calculate weight, calculate Fc and add them. (EDIT) well since i just calculated that Fc and Mg are equal for the velocity, total tension is going to be 2x Mg = 98N

this is assuming that velocity is constant, and that i have not made some retarded simple error, as i did not put much thought into this.

how can you not do this at the end of a the year, and if you just started, what a random thing to start on.

[Vortrex]

I appreciate the help guys I get the concept now and yeah this is about 1.5 months into the course material so we've still got a bit to do

[Mor3BL7]

the answer is 6.