A wood block measures 30 cm by 10 cm, and this block is 5 centimeters thick. The wood block has a weight of 8 Newtons and is floating in water. a. What is the weight of the water displaced by the wood block? (2 points) b. Calculate the height of the water line on the wood block. Show how you start the calculation as well as the calculated answer. (6 points)

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared