Ablock of iron has the dimension of 3.00 cm x 3.00 cm x 3.00 cm. it's has a mass of 213 g. water has a density of 100 g/cm^3. will it sink in water? yesno

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line