This 80 kg roller coaster car weighs how many newtons? How much does gravity pull it down?? This 80 kg car is moving at 20 m/sec at the top where the hill's radius is 100m. What is the centrifugal force?

Will it fly off at the top?

This 80 kg car is moving at 40 m/sec at the bottom where the radius is 50m. What's the centrifugal force there?

What's the total force down at the bottom then?

Someone please awnsers all these question!

Why there is no inductive reactance in dc circuits

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal