1796042
Pregunta 1
Pregunta
Which of these are forms of energy waiting to be turned into one of the other forms? (Tick all that apply)
Respuesta
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Thermal
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Chemical potential
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Gravitational potential
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Kinetic
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Electrical
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Light
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Elastic potential
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Nuclear
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Sound
Pregunta 2
Pregunta
What is the principle of the conservation of energy?
Respuesta
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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.
Pregunta 3
Pregunta
A light bulb has a total energy input of 200J. 190J of this is wasted energy. Work out the energy efficiency.
Respuesta
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10%
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5%
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90%
Pregunta 4
Pregunta
Draw a Sankey diagram for a candle which wastes most of its energy as heat.
Respuesta
-
Image:physics_1 (image/png)
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Image:physics_2 (image/png)
Pregunta 5
Respuesta
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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
Pregunta 6
Pregunta
Tick all of the true statements.
Respuesta
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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.
Pregunta 7
Pregunta
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?
Respuesta
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Conduction
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Convection
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Radiation
Pregunta 8
Pregunta
All types of energy require particles to be transferred.
Respuesta
- True
- False
Pregunta 9
Pregunta
Which of these loses energy more quickly?
Respuesta
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A bright, shiny surface
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A dull, black surface
Pregunta 10
Pregunta
Which features of a vacuum flask prevent heat loss by conduction?
Respuesta
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A thin vacuum between the walls
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Silvered walls
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Cork or plastic stopper
Pregunta 11
Pregunta
Find the work done by a car driving at a force of 500N 200m down a road.
Respuesta
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1000J
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5000J
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700J
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300J
Pregunta 12
Pregunta
What is power?
Respuesta
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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
Pregunta 13
Pregunta
How fast does a stone weighing 4kg fall from a height of 200m?
Respuesta
-
28 m/s
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800 m/s
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63 m/s
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