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from article Rigid-body dynamics
Rotation of a symmetric rigid body around a fixed axis through the center of mass.
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Image
from article Rigid-body dynamics
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from article Rigid-body dynamics
Impulse imparted to a billiard ball by a cue stick. ( After V. D. Barger and M. G. Olsson, Classical Mechanics: A Modern Perspective, 2d ed., McGraw-Hill, New York, 1995)
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from article Rigid-body dynamics
Rotation of a point located at about the z axis.
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from article Rigid-body dynamics
Wheel rolling without slipping on a level surface. (After V. D. Barger and M. G. Olsson, Classical Mechanics: A Modern Perspective, 2d ed., McGraw-Hill, New York, 1995)
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from article Rigid-body dynamics
Velocity of points on a wheel (a) relative to the center of mass and (b) relative to the ground. (After V. D. Barger and M. G. Olsson, Classical Mechanics: A Modern Perspective, 2d ed., McGraw-Hill, New York, 1995)
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from article Rigid-body dynamics
Rolling motion of inertial ellipsoid on the tangent plane describing the force-free motion of a rigid body.
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from article Rigid-body dynamics
Principal axes of a tennis racket (a) along the handle, (b) perpendicular to the handle in the plane of the strings, and (c) perpendicular to the handle and strings. (After V. D. Barger and M. G. Olsson, Classical Mechanics: A Modern Perspective, 2d…
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from article Relaxation time of electrons
Effect of the electric field on electron distribution in a solid, viewed in k-space, where k is the electron wave vector. The shaded area indicates occupied states in distribution which result when the field is applied.
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from article Relaxation time of electrons
Scattering of conduction electrons from lattice vibrations in copper. (a) Fermi surface and Brillouin zone of copper. (b) Dependence of the scattering coefficient on the direction of the conduction electron wave vector, according to theoretical…
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from article Relaxation time of electrons
Electron energy distribution function (density of states) versus energy at five time delays after absorption of an 180-femtosecond laser pulse by a gold film. The broken line is the best Fermi distribution fit at the electron temperature shown.…
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from article Low-temperature acoustics
Experimental arrangement to measure the velocity and attenuation of sound in a sample cooled to 4.2 K (−452°F) using liquid helium.
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from article Low-temperature acoustics
Ratio of the sound attenuation αs in the superconducting state to that in the normal state αn for metallic tin, as a function of temperature T. The superconducting transition temperature Tc is 3.71 K (−453.0°F) for tin.
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from article Low-temperature acoustics
Velocity of the various types of sound in superfluid 4He as a function of temperature. 1 m/s = 3.28 ft/s. °F = (K × 1.8) − 459.67.
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from article Optical microscope
Microscope objectives: (a) 16-mm (0.63-in.) dry achromat; (b) typical high-power dry achromat; (c) 2-mm (0.08-in.), NA 1.40, oil-immersion apochromat. (Photographic Service Department, Kodak Research Laboratory)
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from article Optical microscope
Two types of catadioptric objective. (a) Maksutov type. (b) 53X, NA 0.72, ultraviolet objective, designed by Gray. Glass elements in the latter serve purely as reflectors. (Photographic Service Department, Kodak Research Laboratory)
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from article Optical microscope
Diagram of light microscope. (American Optical Corp.)
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from article Optical microscope
Optical diagram of inverted microscope.
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from article Optical microscope
Diagram of light rays as they pass through a binocular biobjective microscope.
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from article Optical microscope
Light path in critical illumination. (American Optical Corp.)
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from article Optical microscope
Light path in Köhler illumination. (American Optical Corp.)
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from article Optical microscope
Dark-field illumination. (American Optical Corp.)
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from article Optical microscope
Hanging-drop preparation.
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from article Optical microscope
Scanning near-field optical microscope (SNOM or NSOM). (a) Setup. (b) Optical probe next to a metallic film with small holes. (After U. Dürig, D. W. Pohl, and F. Rohner, Near-field optical scanning microscopy, J. Appl. Phys., 59:3318–3327, 1986)
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from article Hygrometer
Simplified resistive hygrometer circuit in which the electrical resistance of the polymer film depends on the ambient humidity. The electrical resistance of the polymer is measured across the electrical leads as shown. The ends of the two electrical…
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from article Hygrometer
Simplified capacitive hygrometer circuit in which the electrical capacitance of the contact electrodes across the polymer film depends on the ambient humidity.
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from article Resonance (alternating-current circuits)
Resonant circuits.
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from article Resonance (alternating-current circuits)
Phasor diagrams at frequencies near resonance (Q = 5).
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from article Resonance (alternating-current circuits)
Universal resonance curve. (After H. H. Skilling, Electrical Engineering Circuits, 2d ed., John Wiley and Sons, 1955)
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from article Resonance (alternating-current circuits)
Multiple resonance. (a) Double-tuned network with mutual inductance M. (b) Current I in R as function of frequency f.
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from article Cellphone camera
The Samsung Galaxy S10’s three rear cameras. From left to right: 12-MP telephoto camera, f/2.4 aperture; 12-MP wide-angle camera, dual f/1.5 and f/2.4 aperture; and 16-MP ultrawide camera, f/2.2 aperture.
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from article Cellphone camera
Photograph taken with the iPhone XR’s single, rear 12-MP wide-angle camera with an f/1.8 aperture, 5X digital zoom, six-element lens system, autofocus with focus pixels, optical image stabilization, bokeh and depth control, and HDR.
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from article Cellphone camera
The Bayer filter, invented by Brice Bayer of Eastman Kodak, overlays the camera image sensor grid to permit the measurement of color by the individual photo sensors. The data are analyzed to provide a color photograph. (a) Top view of the Bayer…
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from article Finite element method
Structures modeled by fitting together structural elements: (a) truss structure; (b) two-dimensional planar structure.
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from article Finite element method
Element types: (a) bar; (b) beam; (c) membrane elements; (d) solid elements; (e) axisymmetric solid; (f) plate-bending elements; (g) curved-shell elements; (h) axisymmetric thin-shell element.
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from article Finite element method
Finite element method of (a) fuselage section and (b) wing of a business jet.
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from article Perpetual motion
Wheel of the Marquis of Worcester.
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from article Perpetual motion
Perpetual-motion device of the first kind based on the hydrostatic paradox.
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from article Perpetual motion
Perpetual motion of the third kind.
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from article Euclidean geometry
Parallel lines and planes.
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from article Euclidean geometry
Normal to a plane.
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from article Euclidean geometry
Regular pentagon ABCDE showing the diagonal d.
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from article Graphic recording instruments
Single-pen, direct-acting, circular-chart pressure recorder. (After D. M. Considine, ed., Process Instruments and Controls Handbook, McGraw-Hill, 1957)
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from article Graphic recording instruments
Multichannel x-t recorder with several recording mechanisms combined in one unit. Signal inputs feed channels at the rear, and each channel has its own set of controls. Multiple pens are staggered to miss each other as they traverse the exhibiting…
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from article Graphic recording instruments
One form of a flat-bed, x-y chart recorder. Plug-in units can be used to configure the recorder range, filter signals, and derive the x movement from elapsed time.
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from article Graphic recording instruments
System for potentiometric feedback positioning of a marker.
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from article Soliton
Static soliton solution of the sin ϕ mode. (a) Field ϕ. (b) Energy density .
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from article Soliton
Space and time variation of the energy density in a collision between two solitons moving in opposite directions. The wave with the higher peak energy is moving faster. The two waves emerge from the collision with shape and speed unchanged.
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from article Soliton
Fluxon oscillator. Steady bias current flows down through the long Josephson junction and forces a fluxon to move in one direction and an antifluxon to move in the other direction. The fluxon is reflected from the end of the structure as an…
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from article Clathrate compounds
Schematic drawing of the lattices of (a, c) urea and (b, d) thiourea; c and d show accommodation of unbranched and branched paraffin chains, respectively.
