Please help with last physics problem ------> The arrangement in the drawing shows a block (mass = 15.6 kg)?

Posted on 2016-07-04 18:39:00 in Physics by SANDY REM

The arrangement in the drawing shows a block (mass = 15.6 kg) that is held in position on a frictionless incline by a cord (length = 0.606 m). The mass per unit length of the cord is 1.30 × 10-2 kg/m, so the mass of the cord is negligible compared to the mass of the block. The cord is being vibrated at a frequency of 164 Hz (vibration source not shown in the drawing). What is the smallest angle θ between 15.0 ° and 90.0 ° at which a standing wave exists on the cord? Answer_____degrees 

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