Question 2 10 pts
A marble rolling across a shelf with a velocity of 3.04 m/s reaches the
edge of the shelf and rolls over the edge. If the marble hits the floor
1.173 meters away from the point on the floor directly beneath the edge
of the shelf, the top of the shelf is m above the floor.

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

Photons with the highest energy have the longest period

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.