WORK, ENERGY AND POWER IN PHYSICS. Course from scratch.

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Matemáticas con Juan

Published on Streamed live on May 3, 2021
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Introductory study of the concepts of work, energy and power in physics. What is energy in general, kinetic energy, potential energy and work. Conservation of energy in an isolated system. STATEMENTS AND SOLUTION OF EXERCISES 4:29 Express the following quantities of energy in joules: a) 10,000 calories b) 50 kWh. 21:42 A force of 1000 N is applied to a body parallel to the ground, causing the body to move 500 m. Find the work done by the force. 28:15 Calculate the work done by a 70 kg man when he rises to a height of 50 m. We consider that the acceleration of gravity is 9.8 m/s2. 37:33 Calculate the kinetic energy, Ec, of: a) a 10 g bullet that has a speed of 500 m/s; b) a 1500 kg car going 108 km/h. 56:23 A 10 kg body is dropped from a height of 100 m. Considering that the acceleration of gravity is g=9.8 m/s2, calculate: a) the kinetic energy and the potential energy before releasing it; b) the kinetic energy and the potential energy when it reaches the ground; c) the speed with which the body reaches the ground. 1:09:07 A spring with elastic constant k=50 N/m is stretched 10 cm with respect to its equilibrium position. Find the elastic potential energy of the spring. 1:16:14 How many watts of power is 1000 hp? And how many hp is 5000 kW? 1:27:12 A person lifts a 100 kg body to a height of 50 m in 10 minutes. a) find the work done; b) find the power. 1:36:27 A spring with a restoring constant of 500 N/m is compressed 15 cm from its equilibrium position and in that situation we place a mass of 25 g next to it. We release the spring and the mass begins to move. Analyze the behavior of the energy in each region and find the speed at A and B. The physics classes before and after this one are here: PART 1 (The most basic) • PHYSICS FROM SCRATCH. Initial course, what ... PART 3 (Gravitation) • GRAVITATION PROBLEMS. Exercises ... Here is a link to the PDF physics problems that we solve: https://drive.google.com/file/d/1nzFK... OTHER PHYSICS FROM SCRATCH VIDEOS Part one (Introduction) • PHYSICS FROM SCRATCH. Initial course, what ... Part three (Gravitation) • GRAVITATION PROBLEMS. Exercises ...

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