(part 1 of 2) A neutron in a reactor makes an elastic head on collision with the nucleus of an atom initially at rest.
Assume: The mass of the atomic nucleus is
about 14.7 the mass of the neutron.
What fraction of the neutron's kinetic energy
is transferred to the atomic nucleus?
1. 0.238549
2. 0.298761
3. 0.271318
4. 0.286041
5. 0.256837
6. 0.290161
7. 0.29141
8. 0.211115
9. 0.270659
10. 0.253598

(part 2 of 2)
If the initial kinetic energy of the neutron is
4.42 x 10^-13 J. find its final kinetic. energy.

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.