A string has its 4th harmonic at 31.5 Hz. What is the frequency of its 3rd harmonic?
Unit= Hz

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

In science and physics what is the standard unit of measure for speed?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .