People can snorkel down to a depth of roughly one meter. This means that the additional pressure on the air in their lungs is roughly
a. 9800 N.
b. 9800 Pa.
c. 9800 ATM.
d. 19,600 N.
e. 19,600 N/m2.
b
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Massive stars cannot generate energy through iron fusion because
a. iron fusion requires very high density. b. stars contain very little iron. c. no star can get hot enough for iron fusion. d. both fusion or fission of iron nuclei absorb energy e. massive stars supernova before they create an iron core.
The number of technological civilizations in our galaxy is limited by
a. the number of stars in our galaxy b. the fraction of stars with planets c. the number of planets per star in habitable zone longer than a few billion years d. the fraction of suitable planet where technical life forms evolve. e. All of the above.
An object that is positively charged will
a. attract a rubber rod stroked with fur. b. attract a glass rod stroked with silk. c. be polarized. d. none of these
Three coplanar parallel straight wires carry equal currents I to the right as shown below. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.