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August 24, 2021
Strontium_90 is particularly dangerous fission product of uranium 235 because it is radioactive and it substitue the calcium in Bones what other direct fission product would accompany it in the neutron induced first fission of uranium 235? This reaction m
University of Michigan - Ann Arbor
Simon Fraser University
University of Sheffield
(II) A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 $g$'s. Calculate the force on a 65-kg person accelerating at this rate.What distance is traveled if brought to rest at this rate from 95 km/h?
I) How much tension must a rope withstand if it is used to accelerate a 1210-kg car horizontally along a frictionless surface at 1.20 m/s$^2$ ?
(II) According to a simplified model of a mammalian heart, at each pulse approximately 20 $g$ of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle?
(I) A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 15.0 m/s. A 3350-kg load, initially at rest, is dropped onto the car. What will be the car's new speed?
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welcome to the next unit in physics. One of three in this unit will be discussing nuclear physics. That is, the physics of the nucleus. Historically, the way that the nucleus was first investigated was through radio activity. The thing is that the nucleus is so stable that the only way to really observe what's happening in it is by looking at nuclei that are unstable. At least that was the case in the past. Originally, the nucleus was first realized from raise that were detected coming from uranium. They called them Alfa rays and beta rays. The beta rays. They realized we're actually electrons. They had all the properties of electrons. They were negatively charged. They were hard to absorb. They could move pretty fast. On the other hand, Alfa Reyes, who were positive and they were easily absorbed by even just a thin sheet of paper. So clearly there was something else inside uranium. Besides just electrons. Also there because Adams are neutrally charged, there had to be some positive charge here, but no one knew how much was positive. And if there was anything in there that might not be charged at all, in fact, originally, it was thought that the atom looked like and assembly of negative and positive charges and possibly something else. But it was shown through an experiment by Rutherford that if you let a few of these Alfa particles go through a thin gold sheet, that they will reflect at strange angles. If it had just been a uniformed Adam, it should have just deflected at small angles. But the's deflected at large angles and in some cases even bounced directly back at the source of the radiation. This meant that rather than some small spread out Adam, what we had was a nuclear model that is to say, positives in the middle and negatives on the outside. As people found different ways to study the nucleus, they realized that there was more than just positive molecules on the inside policy positive particles on the inside. There are also neutrally charged particles on the inside, So in the coming section, we'll talk about the structure of the nucleus, how we study it now, how it was studied then, and what we can determine from it and use it for
Condensed Matter Physics