
Midterm Exam 1
... car as shown in the figure on the left. When the car is at rest, the string hangs vertically. What angle θ does the string make (a) when the car accelerates at a constant a 2.0 m / s 2 , and (b) when the car moves at constant ...
... car as shown in the figure on the left. When the car is at rest, the string hangs vertically. What angle θ does the string make (a) when the car accelerates at a constant a 2.0 m / s 2 , and (b) when the car moves at constant ...
IPC Review - Humble ISD
... 17. Two spheres, A and B, are simultaneously projected horizontally from the top of a tower. Sphere A has a horizontal speed of 40.0 meters per second and sphere B has a horizontal speed of 20.0 meters per second. Which statement best describes the time required for the spheres to reach the ground a ...
... 17. Two spheres, A and B, are simultaneously projected horizontally from the top of a tower. Sphere A has a horizontal speed of 40.0 meters per second and sphere B has a horizontal speed of 20.0 meters per second. Which statement best describes the time required for the spheres to reach the ground a ...
AS Unit G481: Mechanics
... tends to produce rotation only explain that both the net force and net moment on an extended object in equilibrium is zero ...
... tends to produce rotation only explain that both the net force and net moment on an extended object in equilibrium is zero ...
Document
... The observation that there are few spiral galaxies in areas of high galaxy density. ...
... The observation that there are few spiral galaxies in areas of high galaxy density. ...
Centripetal acceleration
... This acceleration can be caused by various forces: • gravity (objects attracted by earth) • tension (object making circular motion on a rope) • friction (car driving through a curve) ...
... This acceleration can be caused by various forces: • gravity (objects attracted by earth) • tension (object making circular motion on a rope) • friction (car driving through a curve) ...
Beyond the Solar System By Patti Hutchison ANSWER THE
... As a galaxy, the Milky Way is actually a giant. Its diameter is about 100,000 light years. A light year is the distance that light travels in one year. A light year is about 9.5 trillion kilometers or about 6 trillion miles. Our solar system is about 4.6 billion years old. Our sun is a young star. S ...
... As a galaxy, the Milky Way is actually a giant. Its diameter is about 100,000 light years. A light year is the distance that light travels in one year. A light year is about 9.5 trillion kilometers or about 6 trillion miles. Our solar system is about 4.6 billion years old. Our sun is a young star. S ...
Forces and Motion Lab Results Example
... the car has maintained a more or less constant motion, the bubble will return to the middle of the level. b. The reason the bubble moves forward intitially is that the inertia of the liquid in the level tends to make the liquid stay in the same place as the car is accelerated forward. As the car an ...
... the car has maintained a more or less constant motion, the bubble will return to the middle of the level. b. The reason the bubble moves forward intitially is that the inertia of the liquid in the level tends to make the liquid stay in the same place as the car is accelerated forward. As the car an ...
17AP_Physics_C_-_Rotational_Motion_II
... Static Equilibrium According to Newton's first law, if an object is at rest it can be said to be in a state of static equilibrium. In other words, all of the FORCES cancel out to that the net force is equal to zero. Since torque is the angular analog to force we can say that if a system is at rest, ...
... Static Equilibrium According to Newton's first law, if an object is at rest it can be said to be in a state of static equilibrium. In other words, all of the FORCES cancel out to that the net force is equal to zero. Since torque is the angular analog to force we can say that if a system is at rest, ...
Dynamic forces - Physics Champion
... level track 36km/hr when it collides with and couples up to another coach of mass 20t moving in the same direction at 6km/hr. Both of the coaches continue in the same direction after coupling. What is the combined velocity of the two coaches? ...
... level track 36km/hr when it collides with and couples up to another coach of mass 20t moving in the same direction at 6km/hr. Both of the coaches continue in the same direction after coupling. What is the combined velocity of the two coaches? ...
Example2-CQZ2
... Use the scantron forms (pencil only!) for the multiple choice problems. Circle the ansers on the examination sheet as well, and return it together with the scantron form. Use the back of these page, or attache your own pages with solutions for the problems which require calcuations. The multiple-cho ...
... Use the scantron forms (pencil only!) for the multiple choice problems. Circle the ansers on the examination sheet as well, and return it together with the scantron form. Use the back of these page, or attache your own pages with solutions for the problems which require calcuations. The multiple-cho ...
17AP_Physics_C_-_Rotational_Motion_II
... STATIC EQUILIBRIUM According to Newton's first law, if an object is at rest it can be said to be in a state of static equilibrium. In other words, all of the FORCES cancel out to that the net force is equal to zero. Since torque is the angular analog to force we can say that if a system is at rest, ...
... STATIC EQUILIBRIUM According to Newton's first law, if an object is at rest it can be said to be in a state of static equilibrium. In other words, all of the FORCES cancel out to that the net force is equal to zero. Since torque is the angular analog to force we can say that if a system is at rest, ...
The galaxies that host powerful radio sources
... Angular resolution – comparable to the best optical imaging. No more “blobs at high redshift” – will be able to map the distribution of gas and dust in forming galaxies. ...
... Angular resolution – comparable to the best optical imaging. No more “blobs at high redshift” – will be able to map the distribution of gas and dust in forming galaxies. ...
General Instructions
... (d) A rocket engine works by burning fuel and ejecting it at high speed from the rocket nozzle. With reference to two of Newton’s Laws of motion, explain how this system can launch the rocket. ...
... (d) A rocket engine works by burning fuel and ejecting it at high speed from the rocket nozzle. With reference to two of Newton’s Laws of motion, explain how this system can launch the rocket. ...
PPT_W07D1_mac
... What was the magnitude of the displacement of Andy’s center of mass after he left the floor? ...
... What was the magnitude of the displacement of Andy’s center of mass after he left the floor? ...
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.