Archaeologists use a mass spectrometer to separate the nitrogen isotopes ^14N and ^15N. The +1 ions of ^15N enters the spectrometer with a speed of 8.5 km/s, and they travel in a circular arc of radius 25.0 cm. The magnetic field in the spectrometer has strength 5.29 x 10^-3T. What is the mass of a ^15N atom? Let the charge on a proton q = 1.6 x 10^-19 C.

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Which graph represents motion with an object with positive velocity that is located at a position of 3 meters at a time of 0 seconds? a) a b) bb eliminate c) c d) d

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical