A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown. A - what is the zero error of the micrometer?
B - what is the correct diameter wire?

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.)

How can waves travel through ground?

If we decrease the amount of force and keep all other factors the same what will happen to the amount of work