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1 Exhaust takes away 250J. Engine is heated by 150J. 100 Joules go to make the car move. How many Joules does gasoline produce?
2 Gasoline gives 800J to the engine cylinder. Then, piston rotates shaft and shaft rotates wheels. 200J are used for to rotate wheels. How many joules do go to exhaust pipe?
3 "Baikonur" launches a new space rocket. How does rocket spend energy of fuel? Describe it.
4 There is a machine that lifts heavy objects. Imagine that you can use first law of thermodynamics in the following: A > Q
What can you say about this machine? Where can we find such machine?
5 What do you think about ΔU? Is it a good thing that we have? Is it better to have greater ΔU or smaller ΔU? Why?

driftstiwrx    1   23.11.2020 06:58    12