An electron moves with an unknown velocity through a magnetic field of 1.56 T that points directly east. The electron experiences a force of 6.24 x 10^-15 N directly south. What is the magnitude and direction of the velocity? Show your work. (The charge of an electron is -1.6 x 10^-19 C)

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2