What is the energy of a 4 kg apple that is sitting on a 2 m high tree branch (use ham)

Explanation:

The energy is potential energy, mgh.

m = mass in kg

g = acceleration due to gravity (alot of talk about whether g is 9.8, 9.81 or 10)

h = height above your zero line (alot of times distance to the ground)

PE = mgh = 4 * 10 * 2 = 80 Nm or 80 Joules

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it