(15 points) How does change in a roller coasters motion depend on the sum of the forces and the mass of the ride?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

Could we see a galaxy that is 20 billion light-years away?