Gravitational Lensing Abstract
... Clusters of galaxies at Z ≈ 0.2 with masses of order 1014 M¯ are very effective lenses. Their Einstein radii are of the order of 20 arcseconds. No complete Einstein ring has been found around clusters due to the facts that most clusters are not really spherical mass distributions and since the align ...
... Clusters of galaxies at Z ≈ 0.2 with masses of order 1014 M¯ are very effective lenses. Their Einstein radii are of the order of 20 arcseconds. No complete Einstein ring has been found around clusters due to the facts that most clusters are not really spherical mass distributions and since the align ...
Solutions - faculty.ucmerced.edu
... Solution (a) There are two Doppler shifts in this problem, one from the redshift z, and the other from the rotational motion of the galaxy. The redshift from the galaxy shifts the wavelength λobs = 1 + z = 1.9. λemit Thus, the observed wavelength to the center of the galaxy is λobs = (1 + z) λemit = ...
... Solution (a) There are two Doppler shifts in this problem, one from the redshift z, and the other from the rotational motion of the galaxy. The redshift from the galaxy shifts the wavelength λobs = 1 + z = 1.9. λemit Thus, the observed wavelength to the center of the galaxy is λobs = (1 + z) λemit = ...
Circular-Motion and forces
... 2.4-km (1.5-mile)-long oval track. One of its turns is about 200 m in radius and is banked at 24° above the horizontal. • How fast would a car have to move so that no friction is needed to prevent it from sliding sideways off the raceway (into the infield or off the track)? © 2014 Pearson Education, ...
... 2.4-km (1.5-mile)-long oval track. One of its turns is about 200 m in radius and is banked at 24° above the horizontal. • How fast would a car have to move so that no friction is needed to prevent it from sliding sideways off the raceway (into the infield or off the track)? © 2014 Pearson Education, ...
Physics Review - WLWV Staff Blogs
... A 65 kg person dives into the water from a 10m platform. What is her speed as she enters the water? Given: Mass = 65 kg therefore Fg = -650N ∆x = 10m Trying to find: Speed ...
... A 65 kg person dives into the water from a 10m platform. What is her speed as she enters the water? Given: Mass = 65 kg therefore Fg = -650N ∆x = 10m Trying to find: Speed ...
File
... • Find the tension required to keep a toy airplane of mass m= 0.9 kg on a 17m guideline traveling at – A) 19 m/s – B) 38 m/s ...
... • Find the tension required to keep a toy airplane of mass m= 0.9 kg on a 17m guideline traveling at – A) 19 m/s – B) 38 m/s ...
1301W.500 Sample Quiz 3 Fall 2009
... 3.2. Hockey puck #1 moving at 20 m/s makes an off-center elastic collision with an identical hockey puck, #2, that is at rest on horizontal, frictionless ice. Puck #1 is deflected at an angle of 20˚ from its original direction of motion. Find the velocity of pucks #1 and #2 after the collision, incl ...
... 3.2. Hockey puck #1 moving at 20 m/s makes an off-center elastic collision with an identical hockey puck, #2, that is at rest on horizontal, frictionless ice. Puck #1 is deflected at an angle of 20˚ from its original direction of motion. Find the velocity of pucks #1 and #2 after the collision, incl ...
Big Bang PPT
... But we can also observe small fluctuations of temperature which may have lead to the formation of the galaxies. ...
... But we can also observe small fluctuations of temperature which may have lead to the formation of the galaxies. ...
Centripetal Force Lab
... to the circle) that you are applying to the rope. The diagram below shows the view as if you are looking down from above on the object. ...
... to the circle) that you are applying to the rope. The diagram below shows the view as if you are looking down from above on the object. ...
Universal Gravitation Worksheet
... (1.08x10-7N) 2. What gravitational force does the moon produce on the earth if the centers of the moon and earth are 3.88x108m apart and the moon has a mass of 7.34x1022kg? (1.94x1020N) 3. If the gravitational force between two objects of equal mass is 2.30x10-8N when the objects are 10.0m apart, wh ...
... (1.08x10-7N) 2. What gravitational force does the moon produce on the earth if the centers of the moon and earth are 3.88x108m apart and the moon has a mass of 7.34x1022kg? (1.94x1020N) 3. If the gravitational force between two objects of equal mass is 2.30x10-8N when the objects are 10.0m apart, wh ...
Forces
... • Newton’s 2nd Law of Motion states that the rate of acceleration of an object is proportion to the force applied and inversely proportional to its mass. – A constant force applied to an object will cause it to accelerate at a uniform rate. – As force increases, acceleration increases. – As mass inc ...
... • Newton’s 2nd Law of Motion states that the rate of acceleration of an object is proportion to the force applied and inversely proportional to its mass. – A constant force applied to an object will cause it to accelerate at a uniform rate. – As force increases, acceleration increases. – As mass inc ...
document
... "The net force is always the important thing. If the net force is zero, then Newton's Second Law (and Newton's First Law, too) says that the acceleration of the wagon must be zero." "Yes, I remember Newton's Second Law very well, Old Dobbin.", says Farmer Brown, hopefully. "This physics discussion i ...
... "The net force is always the important thing. If the net force is zero, then Newton's Second Law (and Newton's First Law, too) says that the acceleration of the wagon must be zero." "Yes, I remember Newton's Second Law very well, Old Dobbin.", says Farmer Brown, hopefully. "This physics discussion i ...
Review – Circular Motion, Gravitation, and Kepler`s Laws Date
... Review – Circular Motion, Gravitation, and Kepler’s Laws ...
... Review – Circular Motion, Gravitation, and Kepler’s Laws ...
Forces and Motion
... B. Weight is the gravitational force between an object and Earth. C. Friction is a natural force that can slow down a motion. D. Speed measures how fast an object is moving and in what direction the object is moving towards. ...
... B. Weight is the gravitational force between an object and Earth. C. Friction is a natural force that can slow down a motion. D. Speed measures how fast an object is moving and in what direction the object is moving towards. ...
The Motions of the Planets
... Kepler’s Laws Revisited • Newton showed that if you start with his four laws and consider a small object in orbit around a large one, one can derive all three of Kepler's laws exactly – Note that Newton's laws are much more fundamental than those of Kepler ...
... Kepler’s Laws Revisited • Newton showed that if you start with his four laws and consider a small object in orbit around a large one, one can derive all three of Kepler's laws exactly – Note that Newton's laws are much more fundamental than those of Kepler ...
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.