Using hooke's law, f s p r i n g =k delta x, find the force needed to stretch a spring 2 cm if it has an elastic constant of 3/ncm a: 2/3 n b: 3/2n c: 3n d: 6n

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)

Which are causes of mechanical weathering? (check all that apply) a. acid rain b. plant growth c. animal actions d. carbon dioxide e. pressure release i chose b & e and got the question wrong.