A steel rail way track in kaduna has a length of 27m when the temperature is 35°c. a. what is the length on the 3rd day when temperature is 44°c
b. suppose the truck is held firmly to the ground so that it can expand 10 at stress results in the track due to the temperature change take young modulus of Steel is 2.0 x 10¹¹ and 1m² of linear expansion Steel as 1.1×10`³⁰c

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?