physics

1)A hypothetical neutral atom has 77 electrons. One of its electrons is held in circular orbit of radius r = 0.244 nm by electrostatic attraction between the electron and the nucleus. Assume: the interaction between electrons is negligible. Calculate the speed of orbit of this electron in m/s.

2)Assume the charge in the nucleus of an atom is evenly distributed through the nucleus.

In a hypothetical 56 electron neutral atom, the radius of the nucleus is 5.93 pm. Find the magnitude of the electric field at the surface of this nucleus, in N/C.

3)Two positive point charges are fixed on the x-axis: q1 is at the origin and q2 = 4.73q1 is at (14.6 cm, 0). You now place a third charge Q on the x-axis at (x,0) and it remains at rest. Find x in cm.

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