By Leonid V. Azaroff
In easy-to-follow conversational language, this booklet finds the mysteries of physics and tells concerning the physicists who made it attainable, from the invention of the legislation of gravity via Isaac Newton and the development of the 1st electrical battery by way of Alessandro Volta, to the current century's improvement of solid-state electronics, nuclear hands and nuclear reactors, lasers, and so on. The evolution of physics in the course of four Read more...
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Extra info for Physics over easy : breakfasts with Beth and physics
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Fig. 3. The total momentum of the ejected exhaust gases acting on the left must equal the total momentum of the rocket to the right in order to conserve the momentum of the fuel-rocket system to the same value it had before the fuel’s ignition. “I thought it was the pressure from the rocket’s exhaust pushing against the surrounding air that propelled the rocket,” Beth commented. “This is a commonly held misconception. In outer space there is no air to push against, yet it is possible to maneuver the rocket even out there.
Before you start today’s mini-lecture,’’ Beth said the next morning just as I forked a delicious apple pancake into my mouth, “I’ve been puzzling over Newton’s third law. ” “According to Newton, the mass of an object, when multiplied by its speed, determines its momentum. Suppose a ball strikes a hard surface like the floor. If the collision is one we call elastic, the ball will bounce back with the same speed with which it struck the floor. What actually happened to cause the ball to reverse its momentum?
The first such direct conversion of the mass of uranium atoms into energy took place under the seats of the University of Chicago’s football stadium, where it was used primarily to generate some heat. ” “Yet, llke so many other scientific discoveries, atomic energy can be used to benefit humankind as well. To return to our topic, tell me more about how energy and heat are related,” Beth requested. “First let me tell you what heat is. A Scotchman by name of John Black pictured heat to be a liquid that could flow into a body to warm it and out of it to cool it.
