If a sound waves frequency is 100hz. what is its period

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

What is an example of static friction