Hi, i am kind of at a loss here. I cant seem to figure out this problem, not sure if i am doing it right or not. All help is greatly appreciated.(adsbygoogle = window.adsbygoogle || []).push({});

A ball of mass 4kg is suspended on a light spring with a constant of 850n/m. the ball is spun in a circular orbit at a constant speed so the string makes an angle of 22 degrees from the vertical. find the length of the spring and the speed of the ball.

Here is what i believe the diagram would look like.

http://img212.imageshack.us/my.php?image=22me2.png

alright so here is what i did right/wrong.

fg=mg

= 4(9.8)

fg =39.2N

fg=fspring

mg=kxcos22

39.2=850xcos22

x=aprox 5cm

the length of the spring is 5cm . That sounds pretty wrong...hope in right :D

ok onto the speed.

fc=(mv^2)/r

T=39.2/cos22=42.3

tsin22=fc

42.3sin22=(m(v^2))/r

42.3sin22=(4(v^2))/5sin22

v=2.7m/s

speed = 2.7m/s

so did i do anything wrong..?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Spring, length and speed

**Physics Forums | Science Articles, Homework Help, Discussion**