During each cycle of its operation, a certain heat engine does 40 joules of work while exhausting 160 joules of thermal energy to the environment. The energy efficiency of this heat engine is

A) 75%.
B) 80%.
C) 25%.
D) 20%.
E) None of the above.


D

Physics & Space Science

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The buoyant force that keeps a ship afloat is an example of Pascal's principle

Indicate whether the statement is true or false

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An object is moving in a straight line and at a constant speed of 60 kilometers per hour. We therefore conclude that the net force on this object is zero.

Answer the following statement true (T) or false (F)

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The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 4, there will be how many permitted orbital quantum numbers?

a. 2 b. 4 c. 8 d. 16 e. 32

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