An electron is accelerated from rest through a potential difference of 500 V. It then enters a uniform magnetic field of 0.54 T that points out of the page and is perpendicular to the direction of motion of the electron. Assume the electron is moving in the -x direction. Required:
a. What is the magnetic force (magnitude and direction) that acts on the electron?
b. What is the radius of the path the electron follows in the magnetic field?
c. Would the radius of the electron's path be smaller or larger if the charge of the electron were smaller?

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?