2. A collar moves on a shaft under the action of force F. Force F remains horizontal throughout the motion of the collar. Determine an expression for the velocity of the collar as it reaches position B if it starts from rest at position A. Friction may be neglected.

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.

Which scientist was the first to propose the heliocentric model of the universe? a. aristotle b. isaac newton c. galileo galilei d. nicolaus copernicus

Boiling water is an example of physical change. true or false