For the next problem consider the following springmass syste

For the next problem, consider the following spring-mass system Suppose that you are apply masses 1, 2, and 3 to the mass-spring chain illustrated above such that m = [m_1 m_2 m_3] = [0.200 0.400 .0200] measured in kg. Assume the acceleration due to earth\'s gravity is g = 9.8m/s^2. Also assume that the mass of each spring is zero and that these springs satisfy the ideal version of Hooke\'s law. Then, which of the following gives the displacement vector u = [u_1 (T) u_2 (T) u_3 (T)] measured in meters at t = T when the system is at equilibrium under the force of gravity on earth.

Solution

Biomedical Imaging Question: Using the figure above, calculate the X-ray intensity, as a function of the incident intensity I0, that reaches the detector for each of the three X-ray beams. The dark-shaded area represents bone, and the light-shaded area represents tissue. The linear attenuation coefficients at the effective X-ray energy of 68 keV are 10cm-1 for bone and tissue, respectively.