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Q 1/8
Score 0
Earth is an example of an
30
closed system
open system
free system
isolated sytem
Q 2/8
Score 0
The second law of thermodynamics states that heat flows from
30
it doesn't flow
hot to cold
in all directions
cold to hot
8 questions
Q.
Earth is an example of an
1
30 sec
Q.
The second law of thermodynamics states that heat flows from
2
30 sec
Q.
Energy transformations are 100% efficient.
3
30 sec
Q.
In any transformation, energy may be lost to
4
30 sec
Q.
Which type of engine is most efficient?
5
30 sec
Q.
A crane uses 65000 J of input energy to do 40000 J of useful work. The efficiency of the crane is
6
60 sec
Q.
An coal generator is 30% efficient at converting the fuel from goal into electricity. If a generator uses 4500 J of input energy, how many Joules of useful energy are obtained? Round to the nearest whole number.
7
60 sec
Q.
A toy train that is 72% efficient produces 190 J of useful energy in movement and sound. How many Joules of input energy are required? Round to the nearest whole number.
