After a long day of online classes and watching KPop videos, you decided to close the lid of your laptop (Figure 1). You then realized that your laptop can be idealized as a rigid thin plate BD (mass = 0.370 kg and centroidal mass moment of inertia l = 37/19200 kg-m²) pinned at one end with its side view as shown in Figure 2. The lid with a side length of 250 mm is initially at rest when a load of P = 5.00 N is applied. \10⁰ Figure 1 208 rad/s2 151.3 rad/s2 139.0 rad/s2 66.4 rad/s2 D 250 mm 50⁰ P B Figure 2 4. Which of the following values is closest to the magnitude of the angular acceleration of rigid plate BD?

Problem Description You are stuck in an elevator with a meter stick, a spring with a spring constant of 30 N/m, and an object with a mass of exactly 0.5 kg. When you suspend the object from the end of the spring, you find that the spring stretches by 18 cm. Determine everything you can about the motion of the elevator from this information. Instructions In a neat and organized fashion, write out a solution which includes the following: 1. A sketch of the physical situation with all given physical quantities clearly labeled. 2. Represent the forces exerted on the object using a force diagram and, after you have made your determinations about the motion of the elevator, construct possible motion diagrams representing the motion of the elevator (if you think there is only one possible motion draw that, if you think there are several possible motions draw motion diagrams for each of them). 3. Determine everything you can about the motion of the elevator. Use your force diagram and…