Using sound waves, signals allow oceanographers to determine ocean depth.
a. sonar
b. radar
c. phone
d. radio

Which is not true about oxygen-17 and oxygen-18?

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.