Use the drop-down menus to complete the sentences. A concave lens is
A convex lens is
v in the middle than at the edges, and causes light rays to
vin the middle than at the edges, and causes light rays to

Select the correct answer from each drop-down menu. compared to its surroundings, the concentration of solutes is low inside a cell. so, the cell is with respect to its surroundings. a particular solute in this cell uses energy for its transport from the cell to its surroundings. this type of transport is called

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Convection currents are caused by differences in what two things?