What is formed in the shape of a long, low land area between hills or mountains?

The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.

If a balloon is taken outside on a very cold day, what will occur?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value