Q1. The loaded cab of an elevator has a mass of 1.7 x 103 kg and moves 239 m up the shaft in 19 s at constant speed. At what average rate does the force from the cable do work on the cab?

Q2. Two equal masses are connected to each other and to walls. The masses are constrained to stay on a horizontal line.

(a) Set up the Newtonian acceleration equation for each mass.

(b) Answer the secular equation for the eigenvectors.

(c) Find out the eigenvectors and thus the normal modes of motion