Weighing a Galaxy—11 Nov Ast 207 F2005 Nov-09 • Schedule
... • Hwk 8 is due Mon, 16th. • Hwk 9 is due Fri, 20th. – Questions about measuring the mass of galaxies. – No late papers. Answers will be put on angel after class. ...
... • Hwk 8 is due Mon, 16th. • Hwk 9 is due Fri, 20th. – Questions about measuring the mass of galaxies. – No late papers. Answers will be put on angel after class. ...
Exam Practice Questions 2
... II only III that Either I or III. but not II None of these motions guarantees zero acceleration. ...
... II only III that Either I or III. but not II None of these motions guarantees zero acceleration. ...
Nature`s Forces, F due to Gravity, and Grav. Field
... on the surfaces of the Earth and moon. Mass and Weight: recall the important distinction between the mass and weight of an object. Mass is a measure of the ...
... on the surfaces of the Earth and moon. Mass and Weight: recall the important distinction between the mass and weight of an object. Mass is a measure of the ...
Notes - SFA Physics and Astronomy
... Speed (measured in m/sec or ft/sec) is the scalar quantity that measures the rate at which distance is covered. Average speed is simply distance/time. Instantaneous speed, however, is how fast you are moving at an instant in time. It is the quantity measured by the speedometer in your car. The analo ...
... Speed (measured in m/sec or ft/sec) is the scalar quantity that measures the rate at which distance is covered. Average speed is simply distance/time. Instantaneous speed, however, is how fast you are moving at an instant in time. It is the quantity measured by the speedometer in your car. The analo ...
Answers - hrsbstaff.ednet.ns.ca
... 8. FBDs or free body diagrams are diagrams that show the forces acting on an object, the direction of the forces and the magnitude/size of the forces. Use mathematical symbols to show equality of forces if they balance/cancel. 9. Newton’s First Law of Motion (Newton’s Law of Inertia): An object at r ...
... 8. FBDs or free body diagrams are diagrams that show the forces acting on an object, the direction of the forces and the magnitude/size of the forces. Use mathematical symbols to show equality of forces if they balance/cancel. 9. Newton’s First Law of Motion (Newton’s Law of Inertia): An object at r ...
Force and Motion
... Lamont wants to move a 4,800 gram box from the floor to a shelf directly above the box. It takes Lamont 8 seconds to move the box to a shelf that is 0.4 meters from the ground. It takes 12 seconds to move the box to a shelf that is 1.2 meters off the ground. How much more work in joules is required ...
... Lamont wants to move a 4,800 gram box from the floor to a shelf directly above the box. It takes Lamont 8 seconds to move the box to a shelf that is 0.4 meters from the ground. It takes 12 seconds to move the box to a shelf that is 1.2 meters off the ground. How much more work in joules is required ...
Study Guide - Chapter 5
... For more practice calculating average speed, complete the 3 practice problems on p. 120 on the test at the top of the page. See Mr. Tyo for the correct answers. Velocity - the speed of an object in a given direction 1. Velocity is different than speed; it must include a reference direction 2. An obj ...
... For more practice calculating average speed, complete the 3 practice problems on p. 120 on the test at the top of the page. See Mr. Tyo for the correct answers. Velocity - the speed of an object in a given direction 1. Velocity is different than speed; it must include a reference direction 2. An obj ...
Study Guide - Chapter 5
... For more practice calculating average speed, complete the 3 practice problems on p. 120 at the top of the page. See Mr. LeBlanc for the correct answers. Velocity - the speed of an object in a given direction 1. Velocity is different than speed; it must include a reference direction 2. An object’s ve ...
... For more practice calculating average speed, complete the 3 practice problems on p. 120 at the top of the page. See Mr. LeBlanc for the correct answers. Velocity - the speed of an object in a given direction 1. Velocity is different than speed; it must include a reference direction 2. An object’s ve ...
Astro 10 Practice Test 3
... Choose the ONE best answer and mark it on your Parscore form. 10. The Sun is currently undergoing mass loss. What do we call the physical manifestation of this process? a. Sunspots b. The solar wind c. The Sun’s photosphere d. The Sun’s chromosphere 11. What special type of stellar remnant did Zwick ...
... Choose the ONE best answer and mark it on your Parscore form. 10. The Sun is currently undergoing mass loss. What do we call the physical manifestation of this process? a. Sunspots b. The solar wind c. The Sun’s photosphere d. The Sun’s chromosphere 11. What special type of stellar remnant did Zwick ...
Forces act everywhere. They cause changes in motion and also act
... When an apple falls from a tree it accelerates towards the ground. Why? In response to this question most people reply 'gravity'. The idea of an apple falling to the ground is often associated with Newton. Newton's genius was to find a single model which explained not only the motion of an apple fal ...
... When an apple falls from a tree it accelerates towards the ground. Why? In response to this question most people reply 'gravity'. The idea of an apple falling to the ground is often associated with Newton. Newton's genius was to find a single model which explained not only the motion of an apple fal ...
Homework Problems
... 21. The moon orbits the earth once every 27.3 days. What is the centripetal acceleration of the moon? 22. A spacecraft orbits the moon in a circular orbit of radius 8.01 x 10 8 m. What is the velocity of the spacecraft as it orbits? 23. What is the gravitational attraction between the earth and the ...
... 21. The moon orbits the earth once every 27.3 days. What is the centripetal acceleration of the moon? 22. A spacecraft orbits the moon in a circular orbit of radius 8.01 x 10 8 m. What is the velocity of the spacecraft as it orbits? 23. What is the gravitational attraction between the earth and the ...
Galaxies and Stars
... The universe is an infinitely large place; much is filled with emptiness. This emptiness is occupied by different types and stages of galaxies. ...
... The universe is an infinitely large place; much is filled with emptiness. This emptiness is occupied by different types and stages of galaxies. ...
powerppt
... Force = Mass X Acceleration (F=M*A) The greater the force, the more the acceleration The more mass (thus more inertia) an object has the greater the force required for acceleration of the object Newton – unit of measurement for Force The force required to accelerate 1 kg of mass 1 m/s/s ...
... Force = Mass X Acceleration (F=M*A) The greater the force, the more the acceleration The more mass (thus more inertia) an object has the greater the force required for acceleration of the object Newton – unit of measurement for Force The force required to accelerate 1 kg of mass 1 m/s/s ...
Test 2 Review Test 2 Review (15-16)
... the sled and is responsible for continuing its motion on the flat ground. __________ Hansel is running toward Gretel to greet her. In his excitement, Hansel tackles Gretel and knocks her to the floor. During the interaction, Hansel applies a force to Gretel. Since Gretel flew back Hansel must have h ...
... the sled and is responsible for continuing its motion on the flat ground. __________ Hansel is running toward Gretel to greet her. In his excitement, Hansel tackles Gretel and knocks her to the floor. During the interaction, Hansel applies a force to Gretel. Since Gretel flew back Hansel must have h ...
Newton`s Laws Assignment
... 1. There is a formula that can be used to find acceleration and also shows how it is produced. What is this formula? 2. State Newton’s 1st Law. 3. How much weight does a 5.0 kg object have on Earth? 4. Two identical books are resting on a table. One is lying flat while the other is positioned on its ...
... 1. There is a formula that can be used to find acceleration and also shows how it is produced. What is this formula? 2. State Newton’s 1st Law. 3. How much weight does a 5.0 kg object have on Earth? 4. Two identical books are resting on a table. One is lying flat while the other is positioned on its ...
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.