NEED HELP AS SOON AS POSSIBLE, I JUST HAVE A FEW MINUTES LEFT!!! The diagram shows a cathode-ray oscilloscope (c. r.o.) being used to measure the rate of rotation of a flywheel. The flywheel has a small magnet M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated, which is passed to the c. r.o. The display of the c. r.o. is 10 cm wide. The flywheel is rotating at a rate of about 3000 revolutions per minute. Which time-base setting will display clearly separate pulses on the screen? A 1 s cm -1 B 10 ms cm -1 C 100µs cm -1 D 1µs cm -1

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?