One method used to determine unknown atomicmasses consists of precisely measuring the kinetic energiesof the particles involved in a nuclear reactionand using known atomic masses. The mass of 34Si isdetermined by the 30Si(18O, 14O)34Si reaction initiatedby 100-MeV 18O particles. The outgoing particles have86.63 MeV of energy, which can be determined onlyby measuring the 14O energy and using the conserva-tion of momentum and energy. (a) What is the Qvalue of the reaction? (b) What is the mass of 34Si assumingthe other three masses involved are known(see Appendix 8)?
Nonconservative Forces Work Done By Nonconservative Forces ● In the presence of non-conservative forces, the total mechanical energy is not conserved: ○ W totalW conservativnonconservative ○ W = − ΔU + W = ΔK total nc ○ W nc ΔK + ΔU = ΔE Examples ● What height H must we release the car if it just makes it around the circular loop of radius R ● A shot put (m = 7.26 kg) is shot at an angle of 43.4 degrees and released from a height of 1.82 m above ground level then it lands with a final velocity of 20m/s. It lands a horizontal distance of 17.7 m from the release point. With what speed does the shot put leave the thrower’s hand ● A block of mass