Which celestial body is the most likely candidate for life to emerge and evolve?
a. Mars
b. Io
c. Jupiter
d. Venus
e. Europa
a
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A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
A. 0.40 mT B. 0.80 mT C. 0.10 mT D. 0.20 mT E. 0.75 mT
A straw is used for a pea shooter. When you blow through the straw the speed of the emerging pea will be greater if the straw is
A) cut in half. B) full length. C) either cut in half or full length.
The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n = 5 state?
a. –0.544 eV c. 0.544 eV b. 0.378 eV d. –0.378 eV
In Joule's paddle-wheel experiment (shown here), why won't the weight rise when we heat the water?
a. The random motion of water molecules hitting both sides of each paddle wheel does not result in a net force on one side of each paddle. b. Energy conservation would be violated because no external force is applied. c. The heat supplied by the flame does not provide sufficient energy to raise the weight.