A roller coaster car of mass 200 kg starts from rest at the top of a hill 20 m high and rolls down to ground level. From there it starts into a vertical loop. Exactly at the top of the loop it is 15 m high and the radius of curvature of the track is 5.0 m. Assuming negligible friction and air resistance, what is the magnitude of normal force acting on the car at the top of the loop?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).