• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
ch05
ch05

Wednesday, February 25 , 2009
Wednesday, February 25 , 2009

Circular Motion
Circular Motion

... Q10) As you make a right-hand turn in your car, you are pushed against the door to your left. This is because 1) the centrifugal force pushed you to the left. 2) no force pushed you to the right. ...
on Newton Laws of motion File
on Newton Laws of motion File

CLASSICAL_PHYSICS_edit
CLASSICAL_PHYSICS_edit

Thursday, Sept. 18, 2014
Thursday, Sept. 18, 2014

MA Syllabus Summary Blank
MA Syllabus Summary Blank

... plan, choose equipment or resources and perform first-hand investigations to gather data and use available evidence to show the relationship between force, mass and acceleration using suitable apparatus ...
Populations of Galaxies and their Formation at z < 7
Populations of Galaxies and their Formation at z < 7

... For objects with Mb > -21 or log (Mstellar) < 10 ---- m ~1 For objects with Mb < -21 or log (Mstellar) > 10 ---- m ~3.5 ...
Motion and forces (Ch 10 and 11)
Motion and forces (Ch 10 and 11)

Chapter_10
Chapter_10

... d) At the final speed, with what force does the fly (m = 0.01 kg, r = 0.50 m) need to hold on, so that it won’t fall off? (Note difference between angular and centripetal acceleration). ...
WIMPs and MACHOs - Caltech Astronomy
WIMPs and MACHOs - Caltech Astronomy

... except by exquisitely sensitive equipment. These difficulties, however, have not stopped many groups throughout the world from developing devices capable of detecting WIMPs. The detection rates turn out to be within and just beyond the reach of current experimental efforts. The basic idea is to dete ...
Problems - Bartholomew Andrews
Problems - Bartholomew Andrews

File
File

... V. A student whose normal weight is 500 newtons stands on a scale in an elevator and records the scale reading as a function of time. The data are shown in the graph above. At time t = 0, the elevator is at displacement x = 0 with velocity v = 0. Assume that the positive directions for displacement, ...
Name Date
Name Date

... Equipment: Computer with Excel, personal critical thinking skills Background: Consider an object which is dropped in a gravitational field. It falls with constant acceleration (if air resistance is small). On Earth the acceleration of gravity is _____________________. On the Moon the acceleration is ...
ExamIF04 - UMD Physics
ExamIF04 - UMD Physics

... 41. In straight line motion the a. acceleration is parallel (or antiparallel) to the velocity. b. acceleration is perpendicular to the velocity. c. acceleration is vertical, while the velocity can be in any direction. d. acceleration is vertical and the velocity is horizontal. e. none of the above s ...
Volta and the Strange History of Electromagnetism
Volta and the Strange History of Electromagnetism

General Relativity for Pedestrians-
General Relativity for Pedestrians-

Mark the following statements true or false
Mark the following statements true or false

... satellite B is 6 hours. Therefore, from Kepler’s 3rd law, we can conclude that a. The speed of A is twice the speed of B b. A is closer to earth than is B c. B is closer to earth than is A d. The speed of B is greater than the speed of A e. A and B sweep out equal areas around the earth in equal tim ...
forces & energy
forces & energy

... 1. When an object starts to fall through the air, the force of gravity is the only force. 2. The force of gravity does not change in size at all. 3. The force of air resistance starts to increase. 4. When the forces are balanced the object reaches constant maximum speed, called Terminal Velocity. ...
relativity phys311
relativity phys311

Kinematics Multiples
Kinematics Multiples

Does anything happen without a cause? Many people would say
Does anything happen without a cause? Many people would say

Lecture 18
Lecture 18

... torque the acceleration will be less for the second scenario because I is bigger. It would be tougher to get the second dumbbell to rotate because of where we’ve put the axis of rotation, though we haven’t actually changed the masses! But what if we don’t have point masses to deal with? What if we h ...
Free Body Diagram
Free Body Diagram

Analyzing a Dual Fan Carts Motion (Low Tech).
Analyzing a Dual Fan Carts Motion (Low Tech).

... In order to accurately measure the force produced by the fans each lab group will need an electronic lab scale or lab balance, such as a triple beam balance. Typically, each fan with fresh alkaline batteries will have a difference in mass of about 10g = 0.01kg, which is a difference in weight of 0.1 ...
< 1 ... 157 158 159 160 161 162 163 164 165 ... 432 >

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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report