A bullet is fired with a horizontal velocity of 500 m/sec. It passes through a 3-kg block of wood, A, and becomes embedded in a second, 2.5-kg block of wood, B. The bullet causes Blocks A and B to start moving to the right with velocities of 3 m/sec and 5 m/sec, respectively. The mass (g) of the bullet is most nearly:

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

What are the north and south poles of a solenoid change with?

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.