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A certain electric motor produced 15 kJ ...

A certain electric motor produced 15 kJ of energy each second as mechanical work and lost 2 kJ as heat to the surroundings. What is the change in the internal energy of the motor and its power supply each second ?

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The correct Answer is:
17 KJ
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Knowledge Check

  • A certain electric motor produced 15 kJ of energy each second as numerical work and lost 2kJ as heat to the surroundings. What is the change in the internal energy of the motor and its power supply each second.

    A
    `-17 kJ`
    B
    `17 J`
    C
    `27 kJ`
    D
    `23 kJ`

  • A system absorbs 50 kJ heat and does 20 kJ of work. What is the net change in the internal energy of the system ?

    A
    Increase by 30 kJ
    B
    Decrease by 30 kJ
    C
    Increase by 70 kJ
    D
    Decrease by 70 kJ

  • A certain reaction is exothermic by 220kJ and does 10kJ of work. What is the change is the internal energy of the system at constant temperture?

    A
    `+230kJ`
    B
    `+210kJ`
    C
    `-210kJ`
    D
    `-230kJ`

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    A system absorb 600 J of heat and work equivalent to 300 J on its surroundings. The change in internal energy

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    A gas performs 0.320 kJ work on surroundings and absorbs 120 J of heat from the surroundings.Hence change in internal energy is

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