Milky Way Galaxy
... •Galaxy: large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. The Milky Way measures about 100,000 light-years across, and is thought to contain 200 billion stars. •Universe: the totality of known or supposed objects and phenomena thro ...
... •Galaxy: large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. The Milky Way measures about 100,000 light-years across, and is thought to contain 200 billion stars. •Universe: the totality of known or supposed objects and phenomena thro ...
Chapter 10.3-10.5
... baseball moves at 7 m/s. The mass of the golf ball is 0.045 kg and the mass of the baseball is 0.14 kg. Which has a greater momentum? • Golf Ball: 0.045 kg x 16 m/s = 0.72 kg x m/s • Baseball: 0.14 kg x 7 m/s = 0.98 kg x m/s • The baseball has greater momentum ...
... baseball moves at 7 m/s. The mass of the golf ball is 0.045 kg and the mass of the baseball is 0.14 kg. Which has a greater momentum? • Golf Ball: 0.045 kg x 16 m/s = 0.72 kg x m/s • Baseball: 0.14 kg x 7 m/s = 0.98 kg x m/s • The baseball has greater momentum ...
Newton`s Laws of Motion
... philosophy” known as The Principia . The text provides a series of three laws to sum up the basic principles of motion. ...
... philosophy” known as The Principia . The text provides a series of three laws to sum up the basic principles of motion. ...
r (t) - VT Math
... 4 feet above the ground with an initial speed of 95 feet per second at a launch angle of 42 degrees. How high above the ground will the projectile be when it is 224 feet downrange? ...
... 4 feet above the ground with an initial speed of 95 feet per second at a launch angle of 42 degrees. How high above the ground will the projectile be when it is 224 feet downrange? ...
4. acceleration and terminal velocity
... • An object will accelerate in the direction of the resultant force. • A force on a large mass will accelerate it less than the same force on a smaller mass. • Doubling the mass halves the acceleration. ...
... • An object will accelerate in the direction of the resultant force. • A force on a large mass will accelerate it less than the same force on a smaller mass. • Doubling the mass halves the acceleration. ...
Law of Conservation of Momentum
... pTOTAL (i ) pTOTAL ( f ) Momentum can be transferred from one part of a system to another, but the total amount remains constant. Momentum is conserved during any interaction among objects – collisions, explosions, etc. – since these interactions involve INTERNAL impulses (one part of the system ...
... pTOTAL (i ) pTOTAL ( f ) Momentum can be transferred from one part of a system to another, but the total amount remains constant. Momentum is conserved during any interaction among objects – collisions, explosions, etc. – since these interactions involve INTERNAL impulses (one part of the system ...
Uniform Circular Motion
... around a circle with a fixed radius Can the velocity be accelerated even though it has constant speed? Yes, because the velocity may change due to direction. If direction changes and velocity changes then an object can accelerate. ...
... around a circle with a fixed radius Can the velocity be accelerated even though it has constant speed? Yes, because the velocity may change due to direction. If direction changes and velocity changes then an object can accelerate. ...
Watching Galaxies Form Near the Beginning of Time
... Distance and time are always mixed in astronomical observations. ...
... Distance and time are always mixed in astronomical observations. ...
Gravity and Orbits
... •For non-circular orbits, this is not true, because energy keeps changing between the two components. •However, if you average over time, this will still be true ...
... •For non-circular orbits, this is not true, because energy keeps changing between the two components. •However, if you average over time, this will still be true ...
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.