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Please answer the following questions with detailed answers/solutions: Work done by a force on a body has to change the energy of that body. (True/false) Work is a measure of energy. (True/false) A horizontal force F acts on a simple pendulum to displace it through an angle θ. Calculate the work done by gravitational force (with proper sign). The work done by a centripetal force on a circulating body is necessarily zero. (True/false) A block of mass M attached to a spring of spring constant k is pushed down by a force F through a distance x. Find the work done by the spring force. A force F which acts at the topmost point of a disc makes it roll on the floor. For a displacement d, (A) The work done by friction is zero. (True/false) (B) The net work done on the disc is ________. When you jump into the air, the forces exerted by your leg muscles do work on your body. These forces are conservative. (True/false). If the potential energy of a diatomic molecule is given by U=A/r 2 - B/r, where r is the separation between the two atoms and A & B are positive constants, the distance between the two atoms at equilibrium is ___.

Please answer the following questions with detailed answers/solutions:



  1. Work done by a force on a body has to change the energy of that body. (True/false)

  2. Work is a measure of energy. (True/false)

  3. A horizontal force F acts on a simple pendulum to displace it through an angle θ. Calculate the work done by gravitational force (with proper sign).

  4. The work done by a centripetal force on a circulating body is necessarily zero. (True/false)

  5. A block of mass M attached to a spring of spring constant k is pushed down by a force F through a distance x. Find the work done by the spring force.

  6. A force F which acts at the topmost point of a disc makes it roll on the floor. For a displacement d,

    (A) The work done by friction is zero. (True/false)


    (B) The net work done on the disc is ________.




  7. When you jump into the air, the forces exerted by your leg muscles do work on your body. These forces are conservative. (True/false).




  8. If the potential energy of a diatomic molecule is given by U=A/r2 - B/r, where r is the separation between the two atoms and A & B are positive constants, the distance between the two atoms at equilibrium is ___.




 

Grade:12

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