1 Ay 124 Winter 2014 – HOMEWORK #3
... Due Friday, Feb 14, 2014 by 5pm, in Steidel’s mailbox in 249 Cahill Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about ...
... Due Friday, Feb 14, 2014 by 5pm, in Steidel’s mailbox in 249 Cahill Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about ...
OUSNMAR05 - The Open University
... reduce the glare. At times features along different parts of the limb are better presented due the effect of libration – an apparent wobbling of the Moon about its axis – that allows us to see about 59% of its surface. The BAA Handbook and some monthly magazines (Sky & Telescope) give details of the ...
... reduce the glare. At times features along different parts of the limb are better presented due the effect of libration – an apparent wobbling of the Moon about its axis – that allows us to see about 59% of its surface. The BAA Handbook and some monthly magazines (Sky & Telescope) give details of the ...
6.2 Newton`s Second Law
... 3. Acceleration is inversely proportional to mass. Unbalanced forces The first law tells us things in motion can continue to move even without any cause acceleration net force. This is true as long as the motion is at a constant speed and in a straight line. The second law says that any unbalanced f ...
... 3. Acceleration is inversely proportional to mass. Unbalanced forces The first law tells us things in motion can continue to move even without any cause acceleration net force. This is true as long as the motion is at a constant speed and in a straight line. The second law says that any unbalanced f ...
Question 7 - Flipped Physics
... mass m by a cord that passes over a frictionless pulley, as shown above. If the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block? (A) Zero (B) g/4 (C) g/3 (D) 2g/3 (E) g 18. A car initially travels north and then turns to the left al ...
... mass m by a cord that passes over a frictionless pulley, as shown above. If the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block? (A) Zero (B) g/4 (C) g/3 (D) 2g/3 (E) g 18. A car initially travels north and then turns to the left al ...
Slide 1
... unless its mass, velocity, or both change. • Momentum, however, can be transferred from one object to another. • The law of conservation of momentum• if a group of objects exerts forces only on each other, their total momentum doesn’t ...
... unless its mass, velocity, or both change. • Momentum, however, can be transferred from one object to another. • The law of conservation of momentum• if a group of objects exerts forces only on each other, their total momentum doesn’t ...
File
... As the angles get bigger, more tension is “lost” to pulling out (horizontally) instead of pulling up to support the weight. So the total tension, along the angle has to get bigger to make up for that loss. The readings on the scales will only equal each other if they’re held at equal angles. I ...
... As the angles get bigger, more tension is “lost” to pulling out (horizontally) instead of pulling up to support the weight. So the total tension, along the angle has to get bigger to make up for that loss. The readings on the scales will only equal each other if they’re held at equal angles. I ...
Physics Review Questions for Final
... kinetic at the lowest part of its swing c) its energy is all potential at the end points of its swing d) all of the above 26) Which of the following is NOT an example of a simple machine? a) fulcrum b) lever c) inclined plane d) pulley 27) An object will fall over if a) its CG is too high b) its CG ...
... kinetic at the lowest part of its swing c) its energy is all potential at the end points of its swing d) all of the above 26) Which of the following is NOT an example of a simple machine? a) fulcrum b) lever c) inclined plane d) pulley 27) An object will fall over if a) its CG is too high b) its CG ...
What does a force do? Part I
... will decrease. If we decrease c and keep b constant, than a will increase. Think about how this is different than if we increase or decrease b. Did You Know? Newton’s Second Law of Motion: We choose a particular object (objects) as our object of interest — the system. The acceleration a of the syste ...
... will decrease. If we decrease c and keep b constant, than a will increase. Think about how this is different than if we increase or decrease b. Did You Know? Newton’s Second Law of Motion: We choose a particular object (objects) as our object of interest — the system. The acceleration a of the syste ...
inertia! - Mr-Durands
... whether in motion or at rest, every object resists any change to its motion. ...
... whether in motion or at rest, every object resists any change to its motion. ...
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.