Afluence of thermal neutrons is 6.5 x 10" d c m 2in a layer of muscle-equivalent tissue 0.1 gkm4 thick. what is the absorbed dose at the middle of the layer?
assume that the above neutron fluence is approximately uniform throughout
a tissue sphere 5 cm in radius, due to thermalization of a field of intermediate- energy neutrons penetrating the sphere. what is the absorbed dose at the center resulting from thermal-neutron-capture y rays? how does it compare with the total absorbed dose that results (directly or indirectly) from the thermal neu- trons?

Ineed the answer to question 1 , i’m desperate

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)