Suppose you have a solid ball, a piece of pipe and a solid disc that have the same mass and diameter. If you roll them all down a hill in a race, which will reach the

bottom first:

a) First the pipe, then the disc, then the ball

b) First the disc, then the ball, then the pipe

c) First the ball, then the disc, then the pipe

d) There will be 3-way tie since they all have the same mass and diameter.

Aballet student who learns with the of his instructor is demonstrating learning.

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.

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?