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Questão 1
Questão
Which of these are forms of energy waiting to be turned into one of the other forms? (Tick all that apply)
Responda
-
Thermal
-
Chemical potential
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Gravitational potential
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Kinetic
-
Electrical
-
Light
-
Elastic potential
-
Nuclear
-
Sound
Questão 2
Questão
What is the principle of the conservation of energy?
Responda
-
Energy can never be created or destroyed; it can only be converted from one form to another.
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Energy can be created or destroyed; it can also be converted from one form to another.
Questão 3
Questão
A light bulb has a total energy input of 200J. 190J of this is wasted energy. Work out the energy efficiency.
Responda
-
10%
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5%
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90%
Questão 4
Questão
Draw a Sankey diagram for a candle which wastes most of its energy as heat.
Responda
-
Image:physics_1 (image/png)
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Image:physics_2 (image/png)
Questão 5
Responda
-
kinetic ---> electrical
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electrical ---> sound ---> light
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gravitational potential ---> kinetic ---> electrical
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gravitational potential ---> electrical ---> sound
Questão 6
Questão
Tick all of the true statements.
Responda
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A device which transfers one form of energy into another is called a transducer.
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Energy is normally wasted as heat and sound.
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Wasted energy dissipates into the surroundings.
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Dissipated energy cannot be re-used.
Questão 7
Questão
Which type of heat energy transfer only takes place in fluids and involves warmer, less dense regions of fluid moving upwards and being replaced by colder, sinking fluids?
Responda
-
Conduction
-
Convection
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Radiation
Questão 8
Questão
All types of energy require particles to be transferred.
Responda
- True
- False
Questão 9
Questão
Which of these loses energy more quickly?
Responda
-
A bright, shiny surface
-
A dull, black surface
Questão 10
Questão
Which features of a vacuum flask prevent heat loss by conduction?
Responda
-
A thin vacuum between the walls
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Silvered walls
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Cork or plastic stopper
Questão 11
Questão
Find the work done by a car driving at a force of 500N 200m down a road.
Responda
-
1000J
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5000J
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700J
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300J
Questão 12
Questão
What is power?
Responda
-
Power is the rate of doing work.
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Power = work done x time taken
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Power = work done/time taken
Questão 13
Questão
How fast does a stone weighing 4kg fall from a height of 200m?
Responda
-
28 m/s
-
800 m/s
-
63 m/s
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