A crowbar of 2m is used to lift an object of 800N. if the effort arm is 160cm. calculate the effort applied.

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?