The Earth's magnetic field has a strength of about 0.5 Gauss. What is the minimum allowed magnetic field at the center of the Helmholtz coils so that the Earth's magnetic field has less than a 1% effect on your measurements of B vs x or B vs r in this experiment

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Determine the maximum r-value of the polar equation r =3+3 cos 0

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.