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They are parallel .

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Q: When two forces act in the same direction thy are?
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Who invented thy swinging chair?

Thomas Jefferson.


Why area is called a derived quantity?

Derived quantities are quantities that are calculated from two or more measurements. They include area, volume, and density. The area of a rectangular surface is calculated as its length multiplied by its width. The volume of a rectangular solid is calculated as the product of its length, width, and height.


How are mechanical and electromagetic waves different?

Here are some differences between mechanical and electromagnetic waves.Mechanical waves can be either transverse or longitudinal. Electromagnetic waves are only transverse waves.Mechanical waves require a material medium to propagate. Thy can only travel in solids, liquids and gases. Electromagnetic waves do not require any medium. They can travel in vacuum also.Electromagnetic waves travel at the speed of light. Mechanical waves travel at much slower speeds.Mechanical waves propagate by the vibration of molecules of the medium. Electromagnetic waves travel by the oscillations of the electrical and magnetic vectors of a photon.


Mollusks' group of organs is called a?

1. Gastropods: they make up the largest group of mollusks. They have a single shell that is often spiral-shaped. Also thy live in freshwater, saltwater, and terrestrial environment. 2. Bivalves: they include clams, oyster, mussels, and scallops. Most bivalves live in marine or freshwater environments. They use their feet for for digging and anchoring in the mud or sand. 3. Cephalopods: Cephalopods such as squids and octopuses are faster and more agile than gastropods and bivalves. They are marine predators and their mouth is are the center of their foot, which is surrounded by long tentacle-like arms to catch and hold prey. Plato users: C) a foot, a mantle, and a visceral mass


How did Hans Geiger discover the atomic nucleus?

Hans Geiger, by name of Johannes Wilhelm Geiger, was born in Neustadt-an-der-Haardt, German, on September 30, 1882. Being a German nuclear physicist, Geiger was the inventor of the Geiger counter which was a detector for radioactivity.Geiger was awarded the Ph.D. by the University of Erlangen in 1906. Being one of the most valuable collaborator of Ernest Rutherford, Geiger worked in Manchester England with Rutherford from 1906 to 1912. Eventually, in 1911, they devised the first version of the Geiger counter to count the number of alpha particles and other ionising radiation. With the aid of other radiation detectors, he used his counter in early experiments that led to the identification of the alpha particles as the nucleus of the helium atom. They also demonstrated that alpha-particles had two units of charge. It was also observed that occasionally alpha-particles are deflected through large angles when thy strike a thin leaf of gold or silver. This scattering experiment was essential in leading to Rutherford's nuclear theory of the atom, made in 1912, that in any atom, the nucleus occupies a very small volume at the centre.Many theories of radioactivity were also found and demonstrated by Geiger. In 1910, with Rutherford, they showed that two alpha-particles are emitted in the radioactive decay of uranium and in 1912, with J. M. Nuttal, they proved that this is caused by two uranium isotopes. The Geiger-Nuttall rule of 1911, states that the relationship is linear between the logarithm of the range of alpha-particles and the radioactive time constant, which is involved in the rate of decay of emitting nucleus.Geiger returned to Germany in 1914. During World War I, he served as an artillery officer in German Army. With Walther Bothe, Geiger devised the technique of coincidence counting and used it in 1924 to clarify the detail of the Compton effect. In the next year, at the University of Kiel, where he was offered a professional appointments, he and Walther Müller improved the sensitivity, performance, and durability of the particle counter which Geiger made before. Named the Geiger- Müller counter (picture shown on the left) in the present-day, the improved device detects not only alpha particles but other types of ionising radiation such as beta particles (electrons) and ionising electromagnetic photon.Geiger also participated in Germany's abortive attempt to develop an atomic bomb during World War II. He died in Berlin on September 24, 1945.