A spool (mass M and radius R) of rope lets off rope so that it wraps around a pulley and attaches to the ceiling. The pulley is massless and has a weight of mass m hanging from it. See the figure. If the block falls a distance h, how fast is the block moving?

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

Which of these metals are magnetic?