Homework Statement
Particles approximately 3.0 X 10-2 cm in diameter are to be scrubbed loose from machine parts in an aqueous ultrasonic cleaning bath. Above what frequency should the bath be operated to produce wavelengths of this size and smaller?
Homework Equations
speed of...
I'm sorry but I can't seem to set this problem up, I have been doing this homework for 3 hours and this problem seems so easy. to Pe = mgy, but i have a brain fart on finding mass.
Kinetic - energy of Motion (1/2mv^2). can yo walk me through it please
Homework Statement
A skier coasts down a very smooth, 10m high slope. If the speed of the skier on top of the slope is 5.0 m/s what's the speed at the bottom of the slope.
Homework Equations
The Attempt at a Solution
I have to take gravity into consideration right?