Atomic Structure
... The following observations were made: 1. Most of the -particles (nearly 99%) went straight without suffering any deflection. 2. A few of them got deflected through small angles. 3. A very few (about one in 20,000) did not pass through the foil at all but suffered large deflections (more thant 90°) o ...
... The following observations were made: 1. Most of the -particles (nearly 99%) went straight without suffering any deflection. 2. A few of them got deflected through small angles. 3. A very few (about one in 20,000) did not pass through the foil at all but suffered large deflections (more thant 90°) o ...
Wed 9/16
... The initial momentum of the one-student system is nonzero. The initial momentum of the two-student system is zero. We're interested in the force exerted on one student, so we apply the Momentum Principle to a system consisting of one student. We can estimate Δt from the compression distance in the c ...
... The initial momentum of the one-student system is nonzero. The initial momentum of the two-student system is zero. We're interested in the force exerted on one student, so we apply the Momentum Principle to a system consisting of one student. We can estimate Δt from the compression distance in the c ...
Work
... Born: Dec. 24 1818, Salford, Lancashire, England Died: Oct. 11, 1889 Joule studied the nature of heat and discovered its relationship to mechanical work. This led to the theory of conservation of energy, which led to the development of the first law of thermodynamics. (from Wikipedia) ...
... Born: Dec. 24 1818, Salford, Lancashire, England Died: Oct. 11, 1889 Joule studied the nature of heat and discovered its relationship to mechanical work. This led to the theory of conservation of energy, which led to the development of the first law of thermodynamics. (from Wikipedia) ...
Problems
... boy has speed 1.40 m/s at the crest of a slope 2.60 m high and 12.4 m long. At the boĴom of the slope his speed is 6.20 m/s. If air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, find the work he did in pushing forward on his wheels during the downhill ride. ...
... boy has speed 1.40 m/s at the crest of a slope 2.60 m high and 12.4 m long. At the boĴom of the slope his speed is 6.20 m/s. If air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, find the work he did in pushing forward on his wheels during the downhill ride. ...
Electric Charges and Fields
... 1. Two charges, q1 and q2, are separated by a distance, d, and exert a force, F, on each other. What new force will exist if a) q1 is doubled b) q1 and q2 are cut in half c) d is tripled d) d is cut in half e) q1 is tripled and d is doubled? 2. How many excess electrons are on a ball with a charge o ...
... 1. Two charges, q1 and q2, are separated by a distance, d, and exert a force, F, on each other. What new force will exist if a) q1 is doubled b) q1 and q2 are cut in half c) d is tripled d) d is cut in half e) q1 is tripled and d is doubled? 2. How many excess electrons are on a ball with a charge o ...
chapter_7
... Born: Dec. 24 1818, Salford, Lancashire, England Died: Oct. 11, 1889 Joule studied the nature of heat and discovered its relationship to mechanical work. This led to the theory of conservation of energy, which led to the development of the first law of thermodynamics. (from Wikipedia) ...
... Born: Dec. 24 1818, Salford, Lancashire, England Died: Oct. 11, 1889 Joule studied the nature of heat and discovered its relationship to mechanical work. This led to the theory of conservation of energy, which led to the development of the first law of thermodynamics. (from Wikipedia) ...
Summary of Static Electricity
... Again, it is a scalar so you must pay attention to the signs of the charges. Although it may be convenient to think about electrical potential energy as being analogous to gravitational potential energy. Whenever a charge moves in its ‘natural direction’ it will lose potential energy (negative PE) a ...
... Again, it is a scalar so you must pay attention to the signs of the charges. Although it may be convenient to think about electrical potential energy as being analogous to gravitational potential energy. Whenever a charge moves in its ‘natural direction’ it will lose potential energy (negative PE) a ...
Chapter 6: Newton`s third law of motion – action and
... ground. Earth exerts a force on the ball (the force of gravity). In turn, the ball exerts a force on earth. The force that the ball exerts on earth is the same as the force that earth exerts on the ball. The ball accelerates toward earth as a result of the action force. Does this mean that earth acc ...
... ground. Earth exerts a force on the ball (the force of gravity). In turn, the ball exerts a force on earth. The force that the ball exerts on earth is the same as the force that earth exerts on the ball. The ball accelerates toward earth as a result of the action force. Does this mean that earth acc ...
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.