Name
... What two things can you say about an object’s motion if the net forces on the object are zero? Which of these objects are accelerating? a. A ball that is falling. b. A rocket flying at a constant velocity through space. c. A car traveling down the road at a constant velocity. d. A book resting on a ...
... What two things can you say about an object’s motion if the net forces on the object are zero? Which of these objects are accelerating? a. A ball that is falling. b. A rocket flying at a constant velocity through space. c. A car traveling down the road at a constant velocity. d. A book resting on a ...
A -B
... twice its weight in order to ensure sufficient attraction, compute the required electric field strength near the surface of the drum. The electric force must be the same as twice the gravitational force on the toner particle. ...
... twice its weight in order to ensure sufficient attraction, compute the required electric field strength near the surface of the drum. The electric force must be the same as twice the gravitational force on the toner particle. ...
Nuclear and Thermal Physics
... Therefore protective clothing should be worn to prevent the contamination of the body by radioactive substances. For example, strontium-90 is absorbed into the bones where its radiation damages bone marrow. An external source is less dangerous, because it will only cause damage while it is close to ...
... Therefore protective clothing should be worn to prevent the contamination of the body by radioactive substances. For example, strontium-90 is absorbed into the bones where its radiation damages bone marrow. An external source is less dangerous, because it will only cause damage while it is close to ...
Chapter 24: The Nucleus
... The decay of radioactive nuclei is a statistical process. The decays are governed by waves of probability, just as atomic processes are governed by orbitals of probability. Predicting the instant that a particular nucleus will decay is impossible. It may wait several thousand years in its excited st ...
... The decay of radioactive nuclei is a statistical process. The decays are governed by waves of probability, just as atomic processes are governed by orbitals of probability. Predicting the instant that a particular nucleus will decay is impossible. It may wait several thousand years in its excited st ...
When Energy Conservation Seems to Fail: The Prediction of the
... number of particles. Vice versa, it was expected an integer nuclear moment when the nucleus contained an even number of particles. However, as stressed by Goudsmit (1932, p. 40) through the study of the hyperfine structures of some nuclei, it was found that nuclei that should consist of an even numb ...
... number of particles. Vice versa, it was expected an integer nuclear moment when the nucleus contained an even number of particles. However, as stressed by Goudsmit (1932, p. 40) through the study of the hyperfine structures of some nuclei, it was found that nuclei that should consist of an even numb ...
Chapter 12 Notepacket
... • Two poles that are ___________________ attract each other. • Two poles that are alike _______________________ each other. A magnetic force of attraction holds the two train cars together. ...
... • Two poles that are ___________________ attract each other. • Two poles that are alike _______________________ each other. A magnetic force of attraction holds the two train cars together. ...
Electrostatics and Coulombs Law
... charge. (In the SI system its units are Coulombs.) – Charges can be negative (like electrons) or positive (like protons). – In matter, the positive charges are stuck in place in the nuclei. Matter is negatively charged when extra electrons are added, and positively charged when electrons are removed ...
... charge. (In the SI system its units are Coulombs.) – Charges can be negative (like electrons) or positive (like protons). – In matter, the positive charges are stuck in place in the nuclei. Matter is negatively charged when extra electrons are added, and positively charged when electrons are removed ...
Forces and Motion
... Special Applications of Newton’s Laws Weight and Friction Weight – The force between too bodies, usually between a large mass and a much smaller mass Weight is not an inherent property of an object (like mass or inertia) but is location dependent The farther an object is from the center of the mass ...
... Special Applications of Newton’s Laws Weight and Friction Weight – The force between too bodies, usually between a large mass and a much smaller mass Weight is not an inherent property of an object (like mass or inertia) but is location dependent The farther an object is from the center of the mass ...
Nuclear force
The nuclear force (or nucleon–nucleon interaction or residual strong force) is the force between protons and neutrons, subatomic particles that are collectively called nucleons. The nuclear force is responsible for binding protons and neutrons into atomic nuclei. Neutrons and protons are affected by the nuclear force almost identically. Since protons have charge +1 e, they experience a Coulomb repulsion that tends to push them apart, but at short range the nuclear force is sufficiently attractive as to overcome the electromagnetic repulsive force. The mass of a nucleus is less than the sum total of the individual masses of the protons and neutrons which form it. The difference in mass between bound and unbound nucleons is known as the mass defect. Energy is released when nuclei break apart, and it is this energy that used in nuclear power and nuclear weapons.The nuclear force is powerfully attractive between nucleons at distances of about 1 femtometer (fm, or 1.0 × 10−15 metres) between their centers, but rapidly decreases to insignificance at distances beyond about 2.5 fm. At distances less than 0.7 fm, the nuclear force becomes repulsive. This repulsive component is responsible for the physical size of nuclei, since the nucleons can come no closer than the force allows. By comparison, the size of an atom, measured in angstroms (Å, or 1.0 × 10−10 m), is five orders of magnitude larger. The nuclear force is not simple, however, since it depends on the nucleon spins, has a tensor component, and may depend on the relative momentum of the nucleons.A quantitative description of the nuclear force relies on partially empirical equations that model the internucleon potential energies, or potentials. (Generally, forces within a system of particles can be more simply modeled by describing the system's potential energy; the negative gradient of a potential is equal to the vector force.) The constants for the equations are phenomenological, that is, determined by fitting the equations to experimental data. The internucleon potentials attempt to describe the properties of nucleon–nucleon interaction. Once determined, any given potential can be used in, e.g., the Schrödinger equation to determine the quantum mechanical properties of the nucleon system.The discovery of the neutron in 1932 revealed that atomic nuclei were made of protons and neutrons, held together by an attractive force. By 1935 the nuclear force was conceived to be transmitted by particles called mesons. This theoretical development included a description of the Yukawa potential, an early example of a nuclear potential. Mesons, predicted by theory, were discovered experimentally in 1947. By the 1970s, the quark model had been developed, which showed that the mesons and nucleons were composed of quarks and gluons. By this new model, the nuclear force, resulting from the exchange of mesons between neighboring nucleons, is a residual effect of the strong force.