Power: A 200-W light bulb is connected across a 110-V dc power supply. What current will flow through this bulb?
A. 0.90 A
B. 0.36 A
C. 0 A
D. 0.60 A
E. 1.8 A
Answer: E
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A hypothesis that has been repeatedly and rigorously tested and supported is known as a:
a. model b. testable prediction c. scientific method d. scientific theory e. result
Center of Mass: A 1.0-g bead is at (-2.0 cm, 2.0 cm), a 2.0-g bead is at (2.0 cm, -4.0 cm), and a 3.0-g bead is at (2.0 cm, 0.0 cm). What are the coordinates of the center of mass (or center of gravity) of this system of beads?
Fill in the blank(s) with the appropriate word(s).
Carnot Engine: What is the efficiency of an ideal Carnot engine operating between a reservoir in which ice and water coexist, and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atm for both reservoirs.
A. 27% B. 0.27% C. 100% D. 1.0% E. 15%
Molecular dissociation is the process in which
A) the bonds between atoms in a molecule are broken. B) a molecule goes from the solid phase to the gas phase. C) the bonds between electrons around an atomic nucleus are broken. D) an element changes into another form. E) an electron is shared between atomic nuclei.