What is the focal length of a lens? the distance between the object and the image distance between the object and the center of the lens the distance between the center of the lens and the image the distance between the focal point and the center of the lens

Determine the maximum r-value of the polar equation r =3+3 cos 0

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?