Question
May someone please assist me with these Physics problems, I'd like to check my answers before I submit them. Thank you very much.
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Three spiders are resting on the vertices of a triangular web. The sides of the triangular web have a length of a = 0.79 m, as depicted in the figure. Two of the spiders (S1 and S3) have +6.1 mu C charge, while the other (S2) has -6.1 mu C charge. What are the magnitude and direction of the net force on the third spider (S3)? Suppose the third spider (S3) moves to the origin. Would the net force on the third spider (S3) be greater than, less than, or equal to the magnitude found in part (a)? What are the magnitude and direction of the net force on the third spider (S3) when it is resting at the origin? A metal sphere hangs from a string and has 8 kg of mass. The sphere has a charge of +7.9 pC. A uniform electric field is turned on and directed to the right. Which way does the sphere move? What is the electric force on the metal sphere if the magnitude of the electric field is 10 N/C? When the sphere reaches equilibrium, what is the angle that the string makes with the vertical axis (assuming the same electric field as part (b))? Bees often work together for the greater good of the hive. Sometimes they can get excess charge on them. Four pairs of bees, which can be represented as identical, conducting spheres, bump into each other in the hive. Rank the bees in the order of the size of the magnitude of charge transfer. (Enter your answer in decreasing order of the size of the magnitude of charge transfer. Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.) You hold a ruler that has a charge on its tip 4 cm above a small piece of tissue paper to see if it can be picked up. The ruler has -10 pC of charge. The tissue has 3 g of mass. What is the minimum charge required to pick up the tissue paper?
Explanation / Answer
4)
G = F
0.003*9.8= 9*10^9*10*10^-6*q/0.04^2
so,
q = 0.003*9.8*0.04^2/(9*10^9*10*10^-6) = 5.2266667e-10 C = 0.000522 micro-C