
Chapter 6 Forces in Motion
... • As an object falls, air resistance continues to increase until it exactly matches the downward force of gravity. The object has then reached its terminal velocity…or a net ...
... • As an object falls, air resistance continues to increase until it exactly matches the downward force of gravity. The object has then reached its terminal velocity…or a net ...
18 Center of gravity.
... stone from outer space A rock of 1.00 kg is dropped from outer space (initial velocity=0) at a distance of 2.50Rearth from the Earth’s center. What will its kinetic energy be when it reaches the surface of the earth, ignoring friction. Rearth=6.38x106 m, Mearth=5.98x1024 kg and G=6.67x10-11 Nm2/kg2 ...
... stone from outer space A rock of 1.00 kg is dropped from outer space (initial velocity=0) at a distance of 2.50Rearth from the Earth’s center. What will its kinetic energy be when it reaches the surface of the earth, ignoring friction. Rearth=6.38x106 m, Mearth=5.98x1024 kg and G=6.67x10-11 Nm2/kg2 ...
Motion
... If the speed of an object is constant, it is said to be moving with uniform speed. The average speed of an object over a time interval is the distance traveled by the object divided by the time interval. The instantaneous speed is the speed at Insert speed diagram (4) any given moment. ...
... If the speed of an object is constant, it is said to be moving with uniform speed. The average speed of an object over a time interval is the distance traveled by the object divided by the time interval. The instantaneous speed is the speed at Insert speed diagram (4) any given moment. ...
Chapter 4 Motion
... For a force to move an object, the force must overcome other forces. Suppose you want to pick up a box of books. The force you use to lift the box is the strength of your muscles. The force acting against your muscles is gravity. Recall that weight is the measure of the force of gravity on an object ...
... For a force to move an object, the force must overcome other forces. Suppose you want to pick up a box of books. The force you use to lift the box is the strength of your muscles. The force acting against your muscles is gravity. Recall that weight is the measure of the force of gravity on an object ...
No Slide Title
... earth’s surface. More general: PEgravity=-GMEarthm/r PE=0 at infinity distance from the center of the earth See example 7.12 for consistency between these two. Example: escape speed: what should the minimum initial velocity of a rocket be if we want to make sure it will not fall back to earth? KEi+P ...
... earth’s surface. More general: PEgravity=-GMEarthm/r PE=0 at infinity distance from the center of the earth See example 7.12 for consistency between these two. Example: escape speed: what should the minimum initial velocity of a rocket be if we want to make sure it will not fall back to earth? KEi+P ...
Rotation
... Translation: body’s movement described by x(t). Rotation: body’s movement given by θ(t) = angular position of the body’s reference line as function of time. Angular displacement: body’s rotation about its axis changing the angular position from θ1 to θ2. ...
... Translation: body’s movement described by x(t). Rotation: body’s movement given by θ(t) = angular position of the body’s reference line as function of time. Angular displacement: body’s rotation about its axis changing the angular position from θ1 to θ2. ...
Chapter 12 Notes
... but it is harmed if you are carrying a heavy load. Why? 2. Does a person diet to lose mass or to lose weight? 3. Can the force of gravity on a 1 kg mass ever be greater than on a 2 kg mass? Explain how. 4. A car at a junk yard is compressed until its volume is less than 1 cubic meter. Has its mass c ...
... but it is harmed if you are carrying a heavy load. Why? 2. Does a person diet to lose mass or to lose weight? 3. Can the force of gravity on a 1 kg mass ever be greater than on a 2 kg mass? Explain how. 4. A car at a junk yard is compressed until its volume is less than 1 cubic meter. Has its mass c ...
Introduction. What is a classical field theory?
... Let me finish off this introduction with a long-winded attempt at trying to explain why I think that a class such as the one we are now beginning provides a good – if not better – way to learn all this material. This organization of material just described, while natural in some ways, overlooks the ...
... Let me finish off this introduction with a long-winded attempt at trying to explain why I think that a class such as the one we are now beginning provides a good – if not better – way to learn all this material. This organization of material just described, while natural in some ways, overlooks the ...
REVIEW: (Chapter 4) Newton`s Three Laws of Motion First Law: The
... of the seemingly perpetual motion of astronomical objects such as the Sun, the Moon, and the planets. Here again is the First Law: An object at rest will remain at rest unless and until acted upon by an external force. An object moving at constant velocity will continue to move at constant velocity ...
... of the seemingly perpetual motion of astronomical objects such as the Sun, the Moon, and the planets. Here again is the First Law: An object at rest will remain at rest unless and until acted upon by an external force. An object moving at constant velocity will continue to move at constant velocity ...
Circular motion and Gravitational (chapter no 7)
... The planets around the earth or around the sun moves in an orderly motion due to gravitation. NEWTON’S LAW OF GRAVITATION In order to explain the gravitational force between two bodies, Newton formulated a fundamental law known after his name i.e. "NEWTON'S LAW OF GRAVITATION" Newton’s law of gravit ...
... The planets around the earth or around the sun moves in an orderly motion due to gravitation. NEWTON’S LAW OF GRAVITATION In order to explain the gravitational force between two bodies, Newton formulated a fundamental law known after his name i.e. "NEWTON'S LAW OF GRAVITATION" Newton’s law of gravit ...
chap4 - Laws of Moti..
... (a) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward force due to gravity. When the elevator is accelerating upward, which is greater, T or w? (b) When the elevator is moving at a constant velocity upward, which is greater, T ...
... (a) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward force due to gravity. When the elevator is accelerating upward, which is greater, T or w? (b) When the elevator is moving at a constant velocity upward, which is greater, T ...
AST121 Introduction to Astronomy
... – stars are too close together to be resolved with a telescope – one set of absorption lines are too faint to be seen – analyze doppler shift in the aborption lines of one star, thus measuring its “wobble” and then calculate the properties of the ...
... – stars are too close together to be resolved with a telescope – one set of absorption lines are too faint to be seen – analyze doppler shift in the aborption lines of one star, thus measuring its “wobble” and then calculate the properties of the ...
Review PowerPoint
... A student spinning a 0.10-kilogram ball at the end of a 0.50-meter string in a horizontal circle at a constant speed of 10. meters per second. If the magnitude of the force applied to the string by the student's hand is increased, the magnitude of the acceleration of the ball in its circular ...
... A student spinning a 0.10-kilogram ball at the end of a 0.50-meter string in a horizontal circle at a constant speed of 10. meters per second. If the magnitude of the force applied to the string by the student's hand is increased, the magnitude of the acceleration of the ball in its circular ...
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 ...
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.