Can you help me with the calculations for these please.

7. [-/2 Points] DETAILS SERCP11 15.2.OP.004. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The figure below shows a small, hollow, plastic sphere hanging vertically from a thin, lightweight thread. The sphere has a mass of 7.20 g and a uniformly distributed charge of q, = 31.9 nC. Directly below it is a second sphere with the same mass, but a charge of q, = -58.0 nc. (Assume this second sphere is fixed in place.) The centers of the two plastic spheres are a distance d = 2.00 cm apart. 41 + 92 - (a) What is the tension (in N) in the thread? N (b) The thread will break if the tension in it exceeds 0.180 N. What is the smallest possible value of d (in cm) before the thread breaks? cm Need Help? Read It8. [-/2 Points] DETAILS SERCP11 15.3.OP.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A small piece of foam has a mass of 4.06 g and a charge of -18.2 UC. It levitates, motionless, when placed in a uniform electric field perpendicular to the ground. What is the magnitude of the electric field (in N/C)? N/C What is the direction of the electric field? O upward O downward O east O west Need Help? Read It Submit Answer9. [-/4 Points] DETAILS SERCP11 15.3.P.023.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A proton accelerates from rest in a uniform electric field of 680 N/C. At some later time, its speed is 1.46 x 10 m/s. (a) Find the magnitude of the acceleration of the proton. m/s2 (b) How long does it take the proton to reach this speed? US (c) How far has it moved in that interval? m (d) What is its kinetic energy at the later time? Need Help? Read It Master It Submit