The earth's acceleration due to gravity varies from 9.780 m/s2at the equator to 9.832 m/s2 at the poles. A pendulum whose length is precisely 1.000 m can be used to measure g. Such a device is called a gravimeter.
How long do 100 oscillations take at the equator?
How long do 100 oscillations take at the north pole?

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.

Which of the following is not used to measure wind? oa. psychrometero b. wind socko c. weather vaneo d. anemometer

Me ! since green bounces off red, this must be collision a. elastic b. explosion c. inelastic