# Return time for a string

• Jan 22nd 2011, 06:33 PM
gbenguse78
Return time for a string
Hi
I am struggling with the second part of this problem. It reads this way:

A particle P of mass 0.8kg is attached to one end of a light elastic string of natural length 1.6m and modulus of elasticity 20N. The other end of the string is fixed to a point O on the smooth horizontal surface on which P rests. The particle is held at rest with OP = 2.6m and then released.
a)Show that the, while the string is taut, P moves with simple harmonic motion.
b)Calculate the time from the instant of release until P returns to its starting point for the first time?

• Jan 22nd 2011, 07:58 PM
snowtea
Did you do (a)? You should've gotten a periodic function. The answer to (b) is just asking for the period. Think about it :)
• Jan 22nd 2011, 08:24 PM
gbenguse78
Quote:

Originally Posted by snowtea
Did you do (a)? You should've gotten a periodic function. The answer to (b) is just asking for the period. Think about it :)

Okay. My brain is rolling its nerves and searching for that unique oiling. Thanks. I'll be back!
• Jan 22nd 2011, 10:17 PM
gbenguse78
Quote:

Originally Posted by snowtea
Did you do (a)? You should've gotten a periodic function. The answer to (b) is just asking for the period. Think about it :)

Will I need to consider the time it took the string to Slacken?