Physics of Meteors :: physics space meteor falling star

A falling star is really a Meteor and is a form of space debris. They are not really stars at all. There are cases where meteors have entered the Earth’s atmosphere. In most cases, Meteors burn up upon entry into the atmosphere and never make it to the surface of the planet. There are times when the meteor starts to burn up, but because the mass is big enough, it makes it to the surface, smaller then when it started out. Through both means, the meteor deals with some measure of resistance upon entering the atmosphere. The main resistance that the meteor encounters is air resistance (or drag). Due to this collision with the atmosphere, the meteor’s surface begins to melt and vaporize causing the meteor to start breaking apart at its outer layers. When a meteor enters Earth’s atmosphere, they enter at a minimum velocity. This minimum velocity is about 11km per second (25,000 miles per hour). That is quicker then a bullet being fired from a gun. That is only the minimum; there are meteors that can get going much faster. Another comparison to this is that a space shuttle moves around the Earth roughly at about 8km per second. Most meteors burn up when they enter Earth’s atmosphere. There are a few meteors however, that make it to the surface. The ones that make it to the ground are called meteorites. Not all meteors are the same material wise. Some meteors are made out of rock, while others are made out of iron. Some even have a mixture of both, but in most cases, it is one or the other. A fun fact that came up is that as much a 4 billion meteors fall to the Earth each day. Most of them are not significant enough for anyone to notice. Another one is that the Earth gains about a million kilograms of mass a day from meteors. If you let N equal the number of stone meteorites, which fall on one km2 of the surface of the Earth during a one-year period and N, includes all meteorites with a mass greater then or equal to m kg. The rate of the number of meteorites that touches down is:

My Career as Social Work Practitioner Essay

When I considered social work as a profession the decision was one made with great ease. As a juvenile I faced many hardships that still affect my everyday life. After beginning my education as a social work major I now realize I was a youth that lacked a necessary advocate. Alot of problems that I dealt with could have been disputed or even prevented had I been able to receive certain resources and interact with the proper professionals. I notice also that there are more potential cases than professionals available to solve them today. The world we live in lacks advocates with the well-being of those suffering social problems in mind. My past and the sight I have gained for the future ,alone lead me to the profession of a social worker. As an adolescent I found myself in and out of the juvenile correctional system for various incidents. I now can say I struggled with many typical issues faced by those of my generation, while at the time not knowing of any help available to me outsid e of my home. Not only did I struggle with acting out but I also had many emotional tribulations that I later found could be maintained by seeking help from a clinical professional. While feeling I was at an dead end I met a social worker through Harris County JJAEP named Thelma Herman. With the help of Mrs. Herman I was able to take benefit of all the help and resources I was once lacking. She got involved in the middle of a big crisis in my life that lacked a lot of understanding from those around me. Her influences’ put me in the right direction with my education and allowed me to regain a hold on my life. Once I took advantage of various programs such as; Houston Advocates, MHMRA, and Snap, I was able to notice a great difference in my everyday life due to these resources. When I decided to further my education I spent a period of time looking for a profession that would suite my purpose of wanting to help others, that were in like situations of my own. Helping the youth, educating parents, and providing necessary resources’ for a family to properly function, can all be achieved in the social work profession. In the future as a social worker, I plan to practice at a micro level in schools or possibly a juvenile detention center. Past experiences alone will give me the basis I need to successfully help my clients and give them the necessary resources to be productive in life. My ultimate career goal will be to open a girl’s home, that offers all resources needed for girls age 13-21 with the intentions all who come through the doors will lead successful lives as an adult. I feel that every bit of my goals as a social work practitioner are achievable and thus the reason I find this very profession suitable.

Chapter 23 the Evolution of Populations - 6020 Words

Biology, 7e (Campbell) Chapter 23: The Evolution of Populations Chapter Questions 1) What is the most important missing evidence or observation in Darwins theory of 1859? A) the source of genetic variation B) evidence of the overproduction of offspring C) evidence that some organisms became extinct D) observation that variation is common in populations E) observation that competition exists in populations Answer: A Topic: Concept 23.1 Skill: Knowledge 2) Which hypothesis of inheritance, common at Darwins time, caused many to question the ability of natural selection to bring about adaptation in populations? A) particulate hypothesis B) blending hypothesis C) chromosomal hypothesis D) nucleic acid hypothesis E)†¦show more content†¦What is the percentage of the population that is heterozygous for this allele? A) 3 B) 9 C) 21 D) 30 E) 42 Answer: E Topic: Concept 23.1 Skill: Application 12) In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.2. What is the frequency of individuals with Aa genotype? A) 0.20 B) 0.32 C) 0.42 D) 0.80 E) Genotype frequency cannot be determined from the information provided. Answer: B Topic: Concept 23.1 Skill: Application 13) In a population with two alleles, A and a, the frequency of a is 0.50. What would be the frequency of heterozygotes if the population is in Hardy-Weinberg equilibrium? A) 1.00 B) 0.75 C) 0.50 D) 0.25 E) 0.10 Answer: C Topic: Concept 23.1 Skill: Application 14) Most copies of harmful recessive alleles in a sexual species are carried by individuals that are A) haploid. B) polymorphic. C) homozygous for the allele. D) heterozygous for the allele. E) B and C Answer: D Topic: Concept 23.1 Skill: Knowledge 15) In a population with two alleles, A and a, the frequency of A is 0.2. 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