Acentripetal force causes circular motion because it accelerates an object
toward the center of a circle, which changes the direction of motion but not the speed.
toward the center of a circle, which changes the speed of motion but not the direction.
along the edge of a circle, which changes the direction of motion but not the speed.
along the edge of a circle, which changes the speed of motion but not the direction.
Save and Fit

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

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.