Does anyone know the answer or how to solve this ?

a neutron in a reactor makes a elastic head on collision with the nucleus of an atom initially at rest. assume: the mass of the atomic nucleus is about 11.5 the mass of the neutron. what fraction of the nuetron's kinetic energy is transferred to the atomic nucleus?

if the initial kinetic energy of the neutron is 4.06 × 10^-13 j, find it's final kinetic energy. in units of j

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.