Lecture 17: Black Holes
... halo dark matter may be in the form of compact objects. They have typical stellar masses, but they must be dark… • White dwarfs? No (constraints from metal production, cosmic background radiation…) • So, perhaps this is just an error that will go away… ...
... halo dark matter may be in the form of compact objects. They have typical stellar masses, but they must be dark… • White dwarfs? No (constraints from metal production, cosmic background radiation…) • So, perhaps this is just an error that will go away… ...
Newton and Gravity (PowerPoint)
... Now Newton has introduced parabolas and hyperbolas for unbound objects (those that will escape to infinite distance). No problem! they are mathematically related in a very direct way, as Newton showed. The details needn’t concern us. (See the next panel if keen.) ...
... Now Newton has introduced parabolas and hyperbolas for unbound objects (those that will escape to infinite distance). No problem! they are mathematically related in a very direct way, as Newton showed. The details needn’t concern us. (See the next panel if keen.) ...
Laws of Motion - SCHOOLinSITES
... applies to objects that are moving in two dimensions under the influence of gravity. ...
... applies to objects that are moving in two dimensions under the influence of gravity. ...
Newton`s Laws - schoolphysics
... 4. A stone of mass 500 g is thrown with a velocity of 15 ms-1 across a frozen surface of a lake and comes to rest in 40 m. Calculate: (a) the acceleration (b) the frictional force between the stone and the ice 5. At the start of a 100 m the rear foot of a sprinter can exert a force of some 1150 N on ...
... 4. A stone of mass 500 g is thrown with a velocity of 15 ms-1 across a frozen surface of a lake and comes to rest in 40 m. Calculate: (a) the acceleration (b) the frictional force between the stone and the ice 5. At the start of a 100 m the rear foot of a sprinter can exert a force of some 1150 N on ...
Theme 4 – Newton and Gravity
... being pushed around, and depends on how many atoms it contains in total. ...
... being pushed around, and depends on how many atoms it contains in total. ...
A-105 Homework 1
... 13. (2 pts.) In the TV show Star Trek, the fastest the Enterprise can travel is warp 9 (1516 times the speed of light). How long would it take to travel from one end of the galaxy to the other moving at warp 9? What about from our solar system to the Galactic center? (Express your answers in the mos ...
... 13. (2 pts.) In the TV show Star Trek, the fastest the Enterprise can travel is warp 9 (1516 times the speed of light). How long would it take to travel from one end of the galaxy to the other moving at warp 9? What about from our solar system to the Galactic center? (Express your answers in the mos ...
Gravity PowerPoint Notes
... there were no gravity, inertia would cause the moon to travel in a straight line. If only gravity existed, the earth would be pulled into the sun. ...
... there were no gravity, inertia would cause the moon to travel in a straight line. If only gravity existed, the earth would be pulled into the sun. ...
Document
... b. sliding kinetic friction c. rolling kinetic friction d. gravitational friction ______ 14.Friction occurs because of a. the roughness of any object’s surface. b. only the weights of any two objects. c. only the masses of any two objects. d. unbalanced forces. ______15. If a student has a weight of ...
... b. sliding kinetic friction c. rolling kinetic friction d. gravitational friction ______ 14.Friction occurs because of a. the roughness of any object’s surface. b. only the weights of any two objects. c. only the masses of any two objects. d. unbalanced forces. ______15. If a student has a weight of ...
Sci_ch9_lesson_2_notes
... still, the forces acting on it are balanced. Forces are also balanced when objects’ velocity does not change. Like a bus traveling straight at a constant speed. Unbalanced forces are forces that change an objects motion. Newton’s Second Law of Motion The unbalanced force on an object is equal to the ...
... still, the forces acting on it are balanced. Forces are also balanced when objects’ velocity does not change. Like a bus traveling straight at a constant speed. Unbalanced forces are forces that change an objects motion. Newton’s Second Law of Motion The unbalanced force on an object is equal to the ...
Work, Power, and Energy
... • Compared the fall of an apple with the fall of the moon. • The moon falls in the sense that it falls away from the straight line it would follow if there were no forces acting on it. • Therefore, the motion of the moon and the apple were the same motion. • Showed, everything in the universe follow ...
... • Compared the fall of an apple with the fall of the moon. • The moon falls in the sense that it falls away from the straight line it would follow if there were no forces acting on it. • Therefore, the motion of the moon and the apple were the same motion. • Showed, everything in the universe follow ...
Unit 2a Force and Motion Study Guide Label the following with the
... 6. When a roller coaster makes a sharp turn, you slide in the opposite direction of the turn because of ____________. 7. Newton’s first law of motion states that a. an object in motion remains in motion unless acted upon by an unbalanced force. b. an object in motion eventually comes to a stop. c. ...
... 6. When a roller coaster makes a sharp turn, you slide in the opposite direction of the turn because of ____________. 7. Newton’s first law of motion states that a. an object in motion remains in motion unless acted upon by an unbalanced force. b. an object in motion eventually comes to a stop. c. ...
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.