Jacob and sophia are playing with a merry-go-round on a playground. the merry-go-round can be modeled as a flat disk with massm= 223.0kg and radiusr= 3.3 m that freely rotates horizontally without frictionabout its center axis. when the merry-go-round is already spinning at23 rotations per minute, jacob exerts a constant forcefj= 12.3 ntangent to the outer edge of the merry go round in the direction of themerry-go-round’s rotation. at the same time sophia puts her foot ata distancer= 3.1 m from the center, which exerts a constant force offrictionfs= 21.2 n. how long will it take for the merry-go-round tocome to a stop?

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

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.