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Two small particles A and B having masses m = 0.5 kg each and charges q_1 = (-155//18 muC) and q_2 = (+100 muC) , respectively, are connected at the ends of a nonconducting, flexible, and inextensible string of length r = 0.5 m . Particle A is fixed and B is whirled along a verticle circle with center at A. if a vertically ipward electric field of Strength E = 1.1 xx 10^5 NC^-1 exists in the space, calculate the minimum velocity of particle B required at the highest point so that it may just complete the circle (g = 10 ms^-2) . .

A chinese fire cracker when busted creates 100 dB sound at a distance of 10 cm. this level of sound is dangerous and can create deafness. To reduce the sound to a safer level, we need to stand far from it. At what minimum destance from the fire cracker a person should stand so that sound level heard by him is 40 dB? (Assume that sound energy spread equally in all directions)