Jack is experimenting at a hill in his neighborhood. He wants to determine which car will go down the hill the fastest. He takes three cars of different weights to the hill in his neighborhood and tests to see which car goes down the hill the fastest. What is the dependent variable in his experiment?

What is the coefficient of kinetic friction μk between the block and the tabletop?

When using the scientist method, which step comes last?

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg