In the diagram, q1 = -3.33*10^_9 C and q2 = -5.22*10^_9 C. The electric field at
point P is zero. What is the distance
from P to q2?
91
92
?
0.255 m
(Remember, E points away from + charges,
and toward - charges.)
(Unit = m)

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?