One particle has a charge of -1.87 x 10-°C, while another particle has a charge of -1.10 x 10-°C. If the two particles are separated by 0.05, what is
the electromagnetic force between them? The equation for Coulomb's law is
F = kq192 , and the constant, k, equals 9.00 x 10-9 Nm²/C2.
A. 7.41 x 10-6 N.
B. -7.41 x 10-6N
C. 3.70 x 10-7N
D. -3.70 x 10-7 N

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?