Formula for force of attraction
Field of a cylindrical bar magnet calculated with Ampère s model Two models are used to calculate the magnetic fields of and the forces between magnets. The physically correct method is called the Ampère model while the easier model to use is often the Gilbert model. Ampère model: In the Ampère model…
Peter Higgs theory
However, after struggling with his theories in the 1960s without much support, the subsequent transition to celebrity has not been a comfortable one for him. Nobody else took what I was doing seriously, so nobody would want to work with me,he said in an interview on The Life Scientific on BBC Radio…
Gravitational pull on Moon
By measuring the ages of lunar rocks, we know that the moon is about 4.6 billion years old, or about the same age as Earth. The distance between the Earth and its moon averages about 238, 900 miles (384, kilometers). The diameter of the moon is 2, 160 miles (3, 476 kilometers). The moon s massthe amount of material that makes up the moonis about one-eightieth of the…
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Netflix science documentary
More and more people today are interested in science. With the development of modern technologies, it becomes possible for everyone to get the access to the most interesting and fascinating science documentaries. Video-streaming companies allow us to watch the best science shows and movies, giving us a chance to get closer to the world of science. There are various companies…
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Uses of gravitational force
Gravity between planets We can now use Newton s Law to derive some results concerning planets in circular orbits. Although we know from Kepler s Laws that the orbits are not circular, in most cases approximating the orbit by a circle gives satisfactory results. When two massive bodies exert a gravitational force on one another, we shall see (in the SparkNote on Orbits) that…
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Universe expansion accelerating
One of the observational foundations for the big bang model of cosmology was the observed expansion of the universe. Measurement of the expansion rate is a critical part of the study, and it has been found that the expansion rate is very nearly flat . That is, the universe is very close to the critical density, above which it would slow down and collapse inward toward a future…
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Newtons Apple Tree
In May 2015, UNL planted two Flower of Kent trees on the west side of Jorgensen Hall, home of the Physics & Astronomy Department. Landscape Services cloned the two trees from the original Flower of Kent tree granted to the university in 1991. Also called Newton’s Apple Tree, UNL s first Flower of Kent tree can be found on the southwest corner of Behlen Observatory. UNL…
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