An 80 kg cart goes around the inside of a vertical loop of a roller coaster. the radius of the loop is 5m and the cart moves at a speed of 8m/s at the top. what was the force exerted by the track on the cart at the top of the loop?

The denser a substance, the more tightly packed it is. the table below shows the volume and mass of two different substances. comparison of substances substance volume (cm3) mass (g) r 22 10 s 55 25 which of the two substances is more tightly packed? object r is more tightly packed. object s is more tightly packed. both objects are packed equally tightly. this cannot be determined.