PHYSICS 1B Lecture 1: [4-4] W1T Fluids at Rest

In 0.604 s, a 13.3 kg block is pulled through a distance of 4.54 mon a frictionless horizontal surface, starting from rest. The blockhas a constant acceleration and is pulled by means of a horizontalspring that is attached to the block. The spring constant of thespring is 468 N/m. By how much does the spring stretch?

One arm of a U-shaped tube (open at both ends) contains water, and the other alcohol. If the two fluids meet at exactly the bottom of the U, and the alcohol is at a height of 10.5 cm, at what height will the water be? Answer in cm.

The electric potential is 50V at a point X and 70V at a point Y. What is the minimum average power needed by an external force to move a charge of 4 micro-coulombs from rest at X to rest at Y in 5 seconds?