The density of the earth is given by p=3g/4rG where"p" is the density "G" is the gravitational constant 'r' is the radius of the earth and 'g' is the acceleration due to gravity. Show that the relations are correct on the basis of dimensional analysis .

There are multiple tuning forks present in the room, and annie strikes one with a natural frequency of 400 hz. which of these other tuning forks will begin to vibrate through resonance and make the sound louder? a 200 hz tuning fork a 400 hz tuning fork a 800 hz tuning fork a 1600 hz tuning fork