Evenly Varied Movement 1. During a car race, one of the competitors can reach 100km / h from the start in 5s. What is the average acceleration he describes? 2. A piece of furniture starting from rest with a constant acceleration equal to 1m / s² moves for 5 minutes. At the end of this time, how fast is it acquired?
Light - Behavior and Principles 1. The average distance between Earth and the Sun is 150,000,000 km. How long does light take to reach Earth? (Considering c = 300,000 km / s). The first step is to understand the displacement of light. Since c is a constant velocity, the movement must be uniform, ie: With this, simply replace the values given in the exercise: We can still express this time in minutes: Therefore, the light takes approximately 8 minutes and 20 seconds to travel from the sun. to the earth.
1849 - Armand Fizeau measures the speed of light. 1850 - Rudolf Julius Emanuel Clausius creates the Second Law of Thermodynamics. 1859 Gustav Robert Kirchhoff discovers the spectral lines, different for each chemical element. 1865 - James Clerk Maxwell unifies the laws of electric and magnetic forces.
Note the following experience. Material - 1 cup; - 2 candles; - 1 box of matches. Procedure: - light both candles; - cover one of the candles with a glass; - observe. What keeps the candle flame lit is the oxygen gas. The candle that is not covered with the glass will only go out when the wax runs out. This is because there is so much oxygen gas in the environment.
Boiling: Transformation of a liquid into a vapor operated on the liquid mass itself in the form of bubbles. Development of air bubbles in a liquid subject to heating. echo: More or less clear repetition of a sound reflected by a body. Sound repeated. Repetition. Electricity: A form of natural energy, linked to electrons, manifested by attractions and repulsions, and luminous, chemical and mechanical phenomena.
When a body performs a Circular Motion, it undergoes an acceleration that is responsible for changing the direction of movement, which we call centripetal acceleration, as seen in the MCU. Knowing that there is an acceleration and given the mass of the body, we can, by Newton's 2nd Law, calculate a force that, like the centripetal acceleration, points to the center of the circular path.