A1.0 kg brick falls off a ledge of height 44m and lands on the ground at 3.0 s later.
a. find the final velocity of the brick using equations of motion
b. find the final velocity of the brick using conversation of energy

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

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.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block