2. [0/2 Points] PREVIOUS ANSWERS SERCP11 15.2.P.012. ASK YOUR TEACHER A positive charge q1 = 3.50 HC on a frictionless horizontal surface is attached to a spring of force constant k as in the figure shown below, When a charge of q2 = 9.250 uC is placed 9.50 cm away from the positive charge, the spring stretches by 5.00 mm, reducing the distance between charges to d = 9.00 cm. Find the value of k. 6456 x N/m Submit Answer 3. [0/2 Points] DETAILS PREVIOUS ANSWERS SERCP11 1S.A.P.068. MY NOTES ASK YOUR TEACHER Three identical point charges, each of mass m = 0.210 kg, hang from three strings, as shown in the figure below. If the lengths of the left and right strings are each L = 38.0 cm, and if the angle 9 is 45.0\10. [-/0.62 Points] SERPSE1O 22.3.0P.009. ASK YOUR TEACHER PRACTICE ANOTHER (a) A physics lab instructor is working on a new demonstration. She attaches two identical metal globes with mass m = 0.180 g to cords of length L as shown in the gure. 6) Both globes have the same charge of 6.80 nC, and are in static equilibrium when 9 = 535. What is L (in m)? Assume the cards are massless. ITI (b) What If? The charge on both globes is increased until each cord makes an angle of 9 = 10.7 with the vertical. If both globes have the same electric charge, what is the charge (in nC) on each globe in this case? nC 11. [-l0.62 Points] SERCP11 15.A.P.065. ASK YOUR TEACHER PRACTICE ANOTHER Two hard rubber spheres, each of mass m = 14.9 g, are rubbed with fur on a dry day and are then suspended with two insulating strings of length L = 5.40 cm whose support points are a distance d = 3.21 cm from each other as shown in the figure below. During the rubbing process, one sphere receives exactly twice the charge of the other. They are observed to hang at equilibrium, each at an angle of 0 = 10.5 with the vertical. Find the amount of charge on each sphere. (Assume the two spheres have charges q1 and q2 = 2q1) tdrl l | | | l' I I l L 5} I9 I I I | | | m m (D '71 = C 172 = C Need Help? _ 12. [l0.62 Points] SERCP11 15.2.0P.008. ASK YOUR TEACHER PRACTICE ANOTHER The gure below shows four small spheres, each with a positive charge, at the corners of a square. The length of each side of the square is at The sphere at top-right has a charge of q; the one at lower-le: has a charge of 2.5q; the other two each have a charge of 5.0q. (Assume that the +x-axis is to the right and the +y-axis is up along the page.) (1 5.01.7 q 2 Oq .5q 5. W? (a) What is the magnitude of the force on the sphere with charge q? Express your answer in terms of [(2, q, and a in symbolic form. F= (b) What is the direction of the force on the sphere with charge q? (Enter your answer in degrees counterclockwise from the +xaxis.) counterclockwise from the +X-axis Need Help? 13. [-/0.62 Points] DETAILS SERCP11 15.2.OP.013. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The figure below shows three small, charged spheres at the corners of an equilateral triangle. Sphere A has a charge of 1.45 JC; B has a charge of 5.70 JC; and C has a charge of -5.04 JC. Each side of the triangle is 0.500 m long. What are the magnitude and direction of the net electric force on A? (Enter the magnitude in N and the direction in degrees below the +x-axis.) B + 0.500 m 60.00 + A magnitude N direction o below the +x-axis Need Help? Read It