Earth is approximately a sphere with a radius of 6.37 x 106 m. what are i) its circumference in km ii) its surface in km² iii) its volume in km³

Acharge of 8.4x10^-4 c moves at an angle of 35 degrees to a magnetic field that has a field strength of 6.7x10^-3 t. if the magnetic force is 3.5 x10 ^-2 n, how fast is the charge moving?

What organization and environment is described above?

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.