Explain how warm air temperatures affect the density of the air

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.)

The value of universal gravitational constant is 6.67 × -10 t) newton metre square per kg square ,what does it mean?

Which statements describe the characteristics of asteroids? check all that apply. formed 4.6 billion years ago orbit the sun beyond jupiter range in size from a few feet to more than 500 miles across have a total mass greater than the mass of the moon most are found in the asteroid belt