Let's design a roller coaster. It should consist of a long ramp leading into a loop. The loop should have a radius r of 7.2 m. The cars have a mass M of 211 kg. Assuming that friction can be neglected here, what should be the minimum height h of the ramp (in m) with respect to the bottom of the loop so that the cars don't fall off the track at the top of the loop

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.

Calculate 9 ∙ 10-5 divided by 3 ∙ 10-9. (box after the "10" in answer is for the