Which are characteristics of concave mirrors? Check all that apply.
A. surface curves inward
B. image can be upside down
C. image is always virtual
D. surface curves outward
E. image can be real

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.