Q. A cosmic-ray proton in interstellar space has an energy of 13.0 MeV and executes a circular orbit having a radius equal to that of Earth's orbit around the Sun (1.50 1011 m). What is the magnetic field in that region of space?
Q. A worker pushes horizontally on a large crate with a force of 304 N, and the crate is moved 4.4 m. How much work was done?