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Engineering
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 A machine gun fires 60.0 gram bullets at 6 bullets a second. If the velocity of the bullets is 600 m/s, then the average force on the machine gun is
 

  • Option 1)

    67.0 N

  • Option 2)

    75.0 N.

  • Option 3)

    94.0 N

  • Option 4)

    216 N.

 
As learnt in Perfectly Elastic Collision - Law of conservation of momentum and that of Kinetic Energy hold good. - wherein    We have, 0.06 kg / bullet x 6 bullet / second = 0.36 kg / sec Average force = 0.36 kg/ sec x 600 m / sec = 216 kg ms-2                                                                       = 216 N Option 1) 67.0 N This option is incorrect Option 2) 75.0 N. This...
Engineering
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 A ball collides with a second ball at rest. After the collision, the first ball comes to rest and the second ball moves off at the speed of the first ball. In this collision
 

  • Option 1)

    total momentum is not conserved.
     

  • Option 2)

    total kinetic energy is not conserved.
     

  • Option 3)

     total momentum is conserved but total kinetic energy is not conserved.
     

  • Option 4)

    total momentum and total kinetic energy are conserved and the masses are equal

 
As learnt in Perfectly Elastic Collision - Law of conservation of momentum and that of Kinetic Energy hold good. - wherein    Both momentum and energy will be conserved. Option 1) total momentum is not conserved.   This option is incorrect Option 2) total kinetic energy is not conserved.   This option is incorrect Option 3)  total momentum is conserved but total kinetic energy is not...
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