Physics
... 3. mass is measured in terms of Newton's laws a. inertial mass = object's resistance to change in motion (first law) b. gravitational mass = gravity's affect on an object (second law) 4. third law forces are equal and opposite, but don't cancel each other out because they act on different objects, w ...
... 3. mass is measured in terms of Newton's laws a. inertial mass = object's resistance to change in motion (first law) b. gravitational mass = gravity's affect on an object (second law) 4. third law forces are equal and opposite, but don't cancel each other out because they act on different objects, w ...
21. Galaxy Evolution Agenda The Monty Hall Problem/Paradox 21.1
... momentum tends to shape a collapsing gas cloud into a spinning disk. Thus, ellipticals may have formed from protogalactic clouds with relatively small amounts of angular momentum, while the clouds that formed spirals had greater angular momentum. (2) Dense clouds tend to cool and form stars more rap ...
... momentum tends to shape a collapsing gas cloud into a spinning disk. Thus, ellipticals may have formed from protogalactic clouds with relatively small amounts of angular momentum, while the clouds that formed spirals had greater angular momentum. (2) Dense clouds tend to cool and form stars more rap ...
Mass spectrometry powerpoint
... molecules in the sample. This is true even for things which you would normally expect to form negative ions (chlorine, for example) or never form ions at all (argon, for example). Nearly all lose just one electron (~5% will lose two) ...
... molecules in the sample. This is true even for things which you would normally expect to form negative ions (chlorine, for example) or never form ions at all (argon, for example). Nearly all lose just one electron (~5% will lose two) ...
Acceleration and free fall
... Definition of acceleration for linear v − t graphs Galileo’s experiment with dropping heavy and light objects from a tower showed that all falling objects have the same motion, and his inclined-plane experiments showed that the motion was described by v = at+vo . The initial velocity vo depends on w ...
... Definition of acceleration for linear v − t graphs Galileo’s experiment with dropping heavy and light objects from a tower showed that all falling objects have the same motion, and his inclined-plane experiments showed that the motion was described by v = at+vo . The initial velocity vo depends on w ...
1. setting the scene 2. the cosmic dark ages and the first stars
... lines, or ‘absorption systems’. Each absorption system is at a different distance along the path travelled by the quasar light on its way to our telescopes on Earth, and therefore appears at a different redshift in the quasar spectrum (as a consequence of the universal expansion). Among the differen ...
... lines, or ‘absorption systems’. Each absorption system is at a different distance along the path travelled by the quasar light on its way to our telescopes on Earth, and therefore appears at a different redshift in the quasar spectrum (as a consequence of the universal expansion). Among the differen ...
Chapter 9 Rotational dynamics
... At each instant there is a new point of contact B and therefore a new axis of rotation, but instantaneously the motion consists of a pure rotation about B. the angular velocity of this rotation about B is the same as the angular velocity of the rotation about the center of mass. Since the distance ...
... At each instant there is a new point of contact B and therefore a new axis of rotation, but instantaneously the motion consists of a pure rotation about B. the angular velocity of this rotation about B is the same as the angular velocity of the rotation about the center of mass. Since the distance ...
Modified Newtonian dynamics
In physics, modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's laws to account for observed properties of galaxies. Created in 1983 by Israeli physicist Mordehai Milgrom, the theory's original motivation was to explain the fact that the velocities of stars in galaxies were observed to be larger than expected based on Newtonian mechanics. Milgrom noted that this discrepancy could be resolved if the gravitational force experienced by a star in the outer regions of a galaxy was proportional to the square of its centripetal acceleration (as opposed to the centripetal acceleration itself, as in Newton's Second Law), or alternatively if gravitational force came to vary inversely with radius (as opposed to the inverse square of the radius, as in Newton's Law of Gravity). In MOND, violation of Newton's Laws occurs at extremely small accelerations, characteristic of galaxies yet far below anything typically encountered in the Solar System or on Earth.MOND is an example of a class of theories known as modified gravity, and is an alternative to the hypothesis that the dynamics of galaxies are determined by massive, invisible dark matter halos. Since Milgrom's original proposal, MOND has successfully predicted a variety of galactic phenomena that are difficult to understand from a dark matter perspective. However, MOND and its generalisations do not adequately account for observed properties of galaxy clusters, and no satisfactory cosmological model has been constructed from the theory.