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 amasu Posts: 1, Reputation: 1 New Member #1 Apr 8, 2014, 10:55 PM
Waves and frequencies, tones and harmonic motion (Please help , Swedish student)
I am a Swedish student, it is the first time I am on Reddit and truthfully I am desperate.
I Got a test in 4 hours and I need to know how to solve these 4 basic questions before I take the test. I have used Google translate.

1. A feather is pulled out 4 cm if you hang 50 grams in it. If the spring is then loaded with a total of 150 grams and can pivot up and down the harmonic motion, which is the period?

2. A mass of 0.5 kg undergoing harmonic motion with a frequency of 2 Hz and an amplitude of 8mm. calculate:

3. A machine produces a certain distance of the sound level 87 decibels, how big would the noise level be if three such machines started simultaneously next to each other?

4. A string has a fundamental frequency of 294 Hz. then press down your finger on the string and it will be 25% shorter. What is the new frequency for the new basic tone that arise?

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