PLEASE HELP AND PLEASE SHOW WORK 1. In deep space two spheres each of radius 3.8

Question

PLEASE HELP AND PLEASE SHOW WORK

1. In deep space two spheres each of radius 3.80 m are connected by a 2.98 102 m nonconducting cord. If a uniformly distributed charge of 39.5 mC resides on the surface of each sphere, calculate the tension in the cord.

2

A proton accelerates from rest in a uniform electric field of 662 N/C. At some later time, its speed is 1.40 x 106 m/s. (a) Find the magnitude of the acceleration of the proton 2 m/s (b) How long does it take the proton to reach this speed? Hs (c) How far has it moved in that interval? (d) What is its kinetic energy at the later time?

Explanation / Answer

1)

distance between the centres of two spheres is

7.6 + 298 = 305.6 m

force between two spheres is

F = kq1q2 / r^2

F = (9 x 10^9 x 39.5 x 10^-3 x 39.5 x 10^-3) / (305.6)^2

F= 150.4N

so tension in the rod is 150.4N

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