Lay a pencil on a flat surface. This will serve as the fulcrum for your experiment. 2. Set the center of the ruler on the pencil so that the length of the ruler is perpendicular to the pencil 3. Place stack of 3 pennies onto one end of the ruler. Record the distance from the center of the ruler that these pennies were placed. The distance is from the center of the stack of pennies to the center of the ruler. 4. Predict the distance from the fulcrum that you must place the center of mass of 4, 5, 6, 7 and 8 penny stacks to balance the ruler. You wi

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form