Aprofessional golfer is examining a video of a practice swing. the high‑speed footage shows that his club is in contact with the ball (which was initially at rest on the tee) for only δ=0.971δt=0.971 ms, and the radar gun clocks the speed of the ball as =161vb=161 mph after it comes off the club. the golf ball has a mass of =45.9mb=45.9 g. what is the magnitude of the impulse imparted to the ball by the club?

The earth's magnetic field, with a magnetic dipole moment of 8.0×1022am2, is generated by currents within the molten iron of the earth's outer core. suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter “wire.” the loop diameter is measured from the centers of this very fat wire.to decide whether this is a large or a small current density, compare it to the current density of a 7.0 a current in a 2.0-mm-diameter wire.