The cars on an amusement-park ride travel at a constant velocity of 4.0 m/s on a circular track that has a radius of 4.0 m. What is the magnitude of each car's centripetal acceleration?

A-1 m/s2
B-2 m/s2
C-4 m/s2
D-3 m/s2

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point

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.