Michael is pulling a 75-kg box to the East using a string that is 60° above the horizontal. If he is applying 250 N of force in the string, then what is the acceleration of the box? ( include friction of 10N)

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.