Name the two spectral windows through which electromagnetic radiation easily reaches the surface of earth and describe the largest-aperture telescope currently in use for each window.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)

What instrument is used to measure liquid volume?