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Work Energy Power 2

Quiz by YeoSK

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12 questions
Show answers
  • Q1
    In which situation is work done?
    Zenna studies very hard for the exams.
    John pushes against the whiteboard.
    Ester lifts up a bottle from the floor.
    30s
  • Q2
    In which situation is work not done?
    Cathy holds her bag while walking towards the class.
    Daryl runs up to the classroom because he is late.
    Macho does push-ups in class.
    30s
  • Q3
    Tom pulls the projector to the front of the class. Calculate the work done by Tom.
    Question Image
    15 Nm
    36 Nm
    4 J
    36 J
    30s
  • Q4
    A box of mass 10 kg is carried in a lift from level 1 to level 10 of a building. If the vertical distance between two levels is 3 m, calculate the work done on the box.
    300 J
    270 J
    3000 J
    2700 J
    30s
  • Q5
    A 2 kg box is initially at rest at the bottom of a smooth slope. The box is then being pulled up the slope by a 26 N force. Calculate the work done by the 26 N force.
    Question Image
    40 J
    95 J
    104 J
    52 J
    30s
  • Q6
    A box is pushed 10 m along a horizontal surface by a force of 8 N. The frictional force opposing the motion is 6 N. Calculate the work done by the frictional force.
    Question Image
    80 J
    60 J
    140 J
    20 J
    30s
  • Q7
    A box is pushed 10 m along a horizontal surface by a force of 8 N. The frictional force opposing the motion is 6 N. Calculate the amount of work done that is converted to thermal energy.
    Question Image
    20 J
    140 J
    80 J
    60 J
    30s
  • Q8
    A box is pushed 10 m along a horizontal surface by a force of 8 N. The frictional force opposing the motion is 6 N. Calculate the amount of work done that is converted to kinetic energy
    Question Image
    80 J
    20 J
    60 J
    140 J
    30s
  • Q9
    The box of mass 10 kg is dragged at a constant speed through a horizontal distance of 3 m on a rough surface. If the average frictional force between the box and the surface is 50 N, calculate the work done by the applied force.
    300 J
    150 J
    1500 J
    3000 J
    30s
  • Q10
    The work done by a student to walk up a flight of stairs in 10 seconds is 1200 J. Calculate the power of the student.
    120 W
    12000 W
    12 W
    30s
  • Q11
    An 80 kg man walks up a flight of steps to reach a height of 4 m in 16 seconds. Calculate the minimum power required by man.
    80 W
    20 W
    5120 W
    200 W
    30s
  • Q12
    A dam situated 600 m above a hydroelectric power station supplies water at a rate of 4000 kg/s to drive the generators. Calculate the amount of electrical power generated.
    2.4 MW
    0.24 MW
    24 MW
    30s

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