g The angular size of the Moon when viewed with the unaided eye and through a telescope (both from Earth) is, respectively, 0.60° and 11°. If the focal length of the objective is 50 cm, determine the focal length of the eyepiece.

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

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.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.