A piece of metal has a mass of 20kg and a density of 2.7×10^3kg/m^3.It is attached to a string and immersed in a tank of water. (a) Determine the volume of the object.
(b) Calculate the tension in the string when it is completely immersed.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.