Some Physics HW :)?
I am lost and need help. There are 4 steps to this but hopefully if i get this, I will be able to get the rest.
Assume you have 3 different items weighing 3 different amounts (kg), a shoe- 0.3 kg, a washer- 0.003 kg, and a spoon- 0.045 kg. You now get a 50 cm string and swing the object around for 10 seconds. Shoe does 11 revolutions, spoon does 16 revolutions and the washer does 21 revolutions. Now calculate the speed and centripetal acceleration.
- MathguyLv 52 months agoFavorite Answer
First up... don't forget to choose a BEST answer... !!
speed, that is tangential velocity, v, is :
v = ( 2πr ) * ( # rev ) / t
All the objects have the same value for 2πr, just convert r to meters instead of cm before any calculations .
Total distance each moved is ( 2πr)(# rev) , so each has a different value here.
So you can now find the speed of each [ which is just the magnitude of v using eqn above ] .
Centrip force = mv^2 / r so centrip. accel, a , is:
a = v^2 / r again use r in meters, and your v's from part a)