If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a thermodynamic pump?
What will be an ideal response?
(a) 2.6 (b) 3.6
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Dark matter is ___
a. a cloud of black holes and brown dwarfs in the galactic halo b. extremely cold, supermassive molecular clouds in the disk c. an unknown type of mass that does not emit or absorb photons d. the substance of which black holes are made e. a theory to explain galactic formation that has been proven wrong
What is spacetime?
A) It's the inseparable combination of space and time. B) It's time that we measure when traveling in space. C) It's a graph with four axes. D) It's a way of viewing books at different angles.
Like the discovery of Uranus, the finding of Neptune was accidental
Indicate whether the statement is true or false
On sunny days, why do hot-air balloons suddenly rise when they drift over a wide road or a black asphalt parking lot?
What will be an ideal response?