A common car engine is 20 efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 MJ/L, how many kilometers per liter does the car achieve?
A) 14 km/L
B) 12 km/L
C) 10 km/L
D) 8 km/L
E) none of the above
Question 2
Why is Isaac Newton sometimes said to have united the heavens and Earth?
A) Because he caused the scientific community to accept the idea that Earth is just one planet orbiting the sun like the other planets.
B) Because Newton's law of conservation of energy seems to apply throughout the universe.
C) Because he discovered that the energy processes that power the sun also operate on Earth.
D) Because Newton's law of gravity seems to apply throughout the universe.
E) Because of the fact that there are no exceptions to the laws of thermodynamics.
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Find the resultant for the following force combinations