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
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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)
If a nuclide has a decay constant of 0.765 × 10-6 s-1 and contains 3.0 × 1017 nuclei
(a) what is the half life? (b) what is its initial activity? (c) what is the activity after 12. days?
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
The buoyant force that keeps a ship afloat is an example of Pascal's principle
Indicate whether the statement is true or false