Question

7-8

7. -76.66 points SerPSE109.4.OP 012.MI. My Notes Ask Your Teacher A neutron in a nuclear reactor makes an elastic, head-on collision with the nucleus of a carbon atom initially at rest. (a) What fraction of the neutron's kinetic energy is transferred to the carbon nucleus? (The mass of the carbon nucleus is about 12.0 times the mass of the neutron.) (b) The initial kinetic energy of the neutron is 2.30 10-13). Find its final kinetic energy and the kinetic energy of the carbon nucleus after the collision. neutron carbon nudeus Need Help? Read Master 8. 3.33/6.66 points Previous Answers SerPSE10 9.4.OP.015.MI. My Notes Ask Your Teacher (a) A 13.0 g wad of sticky clay is hurled horizontally at a 110 g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of friction between block and surface is 0.650, what was the speed of the clay (in m/s) immediately before impact? 83.67X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. m/s (1) What If? Could static friction prevent the block from moving after being struck by the wad of clay if the collision took place in a time interval A4 -0.100 s? Explain your answer. Yes, a slightly larger coefficient of static friction could reasonably prevent the block from moving. o No, the coefficient of static friction that would be required is unrealistically large. Need Help? Red

Answer 1

fraction of energy transferre - 4XIX 12 € 1 m, tm r = 1 1 1+12) fx = 48 ft = 0.284 . Energy at neutron En =(1-fJE =(1-00284)* 20 30 x16's = 1.65 xroJ Energy at carbonatoom E = fz XE = 0.284 x 2030x10'3 Ec=0.6581035 -13