(2) Grade 9 (GED) (Grade 9B, G Physics) C С
Choose the correct answer * 15
(0.5 Points)
Which of the selections of equipment contains all the apparatus that would be required
to determine the density of a small, irregularly-shaped stone?
А
Metre ruler, balance
B.
Measuring cylinder, balance
с
Measuring cylinder, metre ruler
D
Measuring cylinder, thermometer
A
B
С

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.