Answers edited by harsh s.

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• A particle A, having a charge of 5.0*10^-7C is fixed in a vertical wall. A second particle B of mass 100 g and having equal charge is suspended by a silk thread of length 30 cm from the wall. The point of suspension is 30 cm above the particle A---?
  
• How do you simplify #e^(-2ln5)#?
  
• Question #46aba
  
• What is the wavelength, in nm, of a photon emitted during a transition from the n = 5 state to the n = 2 state in the hydrogen atom ?
  
• When is #sin(x)=\frac{24cos(x)-\sqrt{576cos^2(x)+448}}{14}#?
  
• The work done against gravity in moving a box with a mass of 5 kilograms through a height of 3 meters is approximately ......... ?
  
• How do you solve #x^2 - 6x - 12=0#?