Questions asked by Joël

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• How can the ionization energy of sodium be calculated knowing that the value of the wavelength at the Start of the continuum in the emittion spectrum is 242nm?
  
• Sand is deposited at a uniform rate of 20g/s and with negligeable kinetic energy unto an empty convergor belt moving horizontally at a constant speed of 10m/s. Calculate the force required to maintain the constant velocity?
  
• A stream 50m wide is flowing at 15m/s. Isaac can swim at a speed of 20m/s in calm water. In what direction ( angle ) must Isaac set off if he must reach the opposite bank by the shortest route?
  
• Sand is deposited at a uniform rate of 20g/s and with negligible kinetic energy unto an empty convegor belt moving horizontally at a constant speed of 10m/s. Calculate the power required to maintain the constant velocity?
  
• How can we prove that the work done to accelerate a body from rest to a velocity, V is given by W=1/2(mV^2)?
  
• A body initially at rest explodes into 2 pieces of mass 2M and 3M respectively having a total kinetic energy E. The kinetic energy of piece of mass 2M after the explosion is?
  
• A pendulum bob of mass 0.5kg hanging from a vertical string of length 20m attached to a fixed point is pulled to one side with the string taut until it makes an angle 30° to the vertical. Calculate the work done on the bob?
  
• A ball is projected vertically upward with a velocity of 30m/s. 2s later another ball is released from the top of a story building 80m tall. Determine after what time the balls bi pass each other and at what height do they bi pass?
  
• A mass of 0.2kg is whirled in a horizontal circle of radius 0.5m by a string inclined at 30° to the vertical. Calculate the tension in the string and the speed of the mass in the horizontal circle?