Answers edited by vrma

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• A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, another ball is dropped from a building 15 m high. After how long will the balls be the same height?
  
• Please solve this wave-optics based question?
  
• An object with volume 6.0*10^1 m^3 and mass of 2.600*10^4 kg will have bouyancy force,in ethyl alcohol?
  
• F. what is the orbital diagram and the corresponding electron configuration of 26Fe?
  
• Mechanics question help on forces?
  
• Particles *P* and *Q* move on a line of greatest slope of a smooth inclined plane. *P* is released from rest at a point *O* on the line and 2s later passes through the point *A* with speed #3.5ms^-1#. (i) Find the acceleration of *P* and the angle?
  
• The wavelength of a photon is 10A find its energy? 2
  
• Two bodies are projected at angle theta and 90 minus theta to the horizontal with the same speed the ratio of their maximum vertical height is?
  
• In harmonic oscillator transition from ground state to second excited state is forbidden, why?