20 points! 4. label each as “independent” variable or “dependent” variable a. variable that you change in an experiment b. variable that you measure (how it responds to the variable you changed) c. the variable that is on the x axis of a graph (horizontal) d. the variable that is on the y axis of a graph (vertical)

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.

What are two examples of phase changes that skip a phase during transition?