Q. You drag a block across a table while a friend presses down on the block. The coefficient of friction between this table and this block is 0.4. The vertical component of the force exerted by the table on the block is 220 N. How big is the horizontal component of the force exerted by the table on the block?

Q. A vertical scale on a spring balance reads from 0 to 245 rm{N}. The scale has a length of 11.0 rm{cm} from the 0 to 245 rm{N} reading. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 3.00 rm{Hz}.Ignoring the mass of the spring, what is the mass m of the fish?