g an electron of mass m subscript e equals 9.11 x 10 to the power of negative 31 end exponent k g kg, charge q equals negative 1.6 x 10 to the power of negative 19 end exponent C is accelerated through a potential difference of V equals 3.5 x 10 cubed V. After being accelerated, the electron enters a uniform magnetic field B equals 0.2 T where the electron begins to move in a circular path perpendicular to B. Determine the radius of the path of the electron.

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r