- #1
MathewsMD
- 433
- 7
An object is constrained by a cord to move in a circular path of radius 0.5m on a horizontal frictionless surface. The cord will break if its tension exceeds 16N. The maximum kinetic energy the object can have is:
Attempt at solution:
Well if tension can only be constant, then velocity is maximum when:
T = mv2/r - mg, right?
since v must be subtracted from to equal T, and this is the case at the bottom of the circle when it is motion.
So then I isolate m,
m = 16 / (2v2 - 9.8)
Then I use K = [8/(2v2 - 9.8)]v2
Now when I get here, I run out of equations to use. I am thinking I have forgotten something, but when I keep trying to isolate for v in other equations, I just keep getting the same answer.
Any help would be greatly appreciated! :)
Attempt at solution:
Well if tension can only be constant, then velocity is maximum when:
T = mv2/r - mg, right?
since v must be subtracted from to equal T, and this is the case at the bottom of the circle when it is motion.
So then I isolate m,
m = 16 / (2v2 - 9.8)
Then I use K = [8/(2v2 - 9.8)]v2
Now when I get here, I run out of equations to use. I am thinking I have forgotten something, but when I keep trying to isolate for v in other equations, I just keep getting the same answer.
Any help would be greatly appreciated! :)