Scientists today learn about the world by

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current