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# One method used to determine unknown atomicmasses consists of precisely measuring the

ISBN: 9781133103721 454

## Solution for problem 59 Chapter 13

Modern Physics for Scientists and Engineers | 4th Edition

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Problem 59

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)?

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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 m1 = 2.40 kg is connected to a second block of mass m2 = 1.80 kg. When the blocks are released, they move through a distance d = 0.500 m at which point m2 hits the floor. The coefficient of friction between m1 and the table is 0.450. Find the speed of the blocks just before m2 lands. ● A 20.0 kg child slides down a 1.0m long slide inclined at 40.0o. The child starts at rest on the top and experiences a frictional force of 5.00 N. What is the speed of the child at the bottom of the slide ● An 80 kg jogger starts from rest and runs uphill in a stiff breeze. At the top of the hill the jogger has done a work W = 1.8 x 104 J, air resistance has done a work W = nc1

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