(Originais Teachy 2023) - Question Medium of Physics

The city of Salvador, famous for its hills and elevators, is a perfect example to demonstrate the force of traction. The Lacerda Elevator, one of the main postcards of the city, transports thousands of people daily between the Upper Town and the Lower Town. Suppose one day, a group of 15 people with an average mass of 70kg decide to use the elevator at the same time. Considering the elevator's mass as 500kg and the acceleration due to gravity equal to 10 m/s², what would be the traction force on the elevator cable when it is at rest or moving at a constant speed?

A traffic engineer installed convex mirrors at various busy intersections to enhance driver visibility and help prevent accidents. At the same time, at a research facility, concave mirrors are used to project larger images of scientific experiments. Taking into account the image formation properties of these two types of mirrors, which of the following statements accurately describes the characteristics of the images formed by convex and concave mirrors in these scenarios?

A solid object is fully submerged in a liquid with a density of 1200 kg/m³ at a depth of 8 metres. Given that the acceleration due to gravity is 9.81 m/s², let’s figure out how the pressure from the liquid on the object changes with depth and how this affects the total buoyant force acting on the object.