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Homework answers / question archive / Concordia University PHYS 273 LESSON 2 1)If the total energy of a system increases this does not necessarily mean that energy was added to the system

Concordia University PHYS 273 LESSON 2 1)If the total energy of a system increases this does not necessarily mean that energy was added to the system

Physics

Concordia University

PHYS 273

LESSON 2

1)If the total energy of a system increases this does not necessarily mean that energy was added to the system. T OR F

 

 

 

  1.    Plans need light in order to grow. They use process of photosynthesis for this. What is the energy transfer involved?

 

    1. electromagnetic - chemical
    2. Nuclear - thermal
    3. electromagnetic - thermal
    4. Chemical - electromagnetic
  2.    Your little sister drops a bag of candy on your head from the roof of your house. Right be- fore it hits your head, it is moving quickly. Which describes candy’s energy from roof to head?

 

    1. Candy has lost kinetic energy and gained potential energy
    2. lost potential energy & gained kinetic
    3. not lost or gained potential energy
    4. not lost or gained kinetic energy

 

 

 

  1. For the law of conservation of energy, we must turn off lights, heaters, etc when we leave the house. T OR F

 

 

 

 

  1. Home appliances that produce heat trend to be low power. T OR F

 

 

 

 

  1. The law of Conversation of energy

 

    1. is a fundamental law of physics with no known exceptions
    2. is a possible means for extending fossil fuel use.
    3. does not apply to earths system
    4. is obeyed in chemical reactions but not nuclear reactions.

 

 

 

 

  1. Power is

 

    1. amount of energy
    2. rate at which energy is produced or consumed
    3. measured in joules
    4. not well defined in physics

 

 

 

 

  1. A ball is rolling down a hill and gaining speed. Which is true?

 

    1. The ball is gaining potential energy and gaining kinetic energy.
    2. The ball is gaining potential energy and losing kinetic energy.
    3. The ball is losing potential energy and gaining kinetic energy.
    4. The ball is losing potential energy and losing kinetic energy.

 

 

 

  1. In an isolated system energy can be transformed from one form to another, but the toal en- ergy in the system must stay constant T OR F

 

 

 

  1. Which of the following could NOT be a unit of power

 

    1. joules per second
    2. watts
    3. calories per hour
    4. joules

 

 

 

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