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01:07Free-falling Bodies: Introduction
All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is not the case.
01:05Free-falling Bodies: Example
An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
The...
The...
01:01Weightlessness
When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
01:12Rocket Propulsion In Empty Space - II
The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
01:18Drag Force and Terminal Speed
An interesting force in everyday life is the force of drag on an object when it is moving in a fluid. Like friction, the drag force always opposes the motion of an object. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. For most large objects, such as cyclists, cars, and baseballs, that are not moving too...
01:24Absolute Motion Analysis- General Plane Motion
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
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1Cooperative Institute for Research in Environmental Sciences and Geological Sciences, University of Colorado, Boulder, CO 80309, USA. roger.bilham@colorado.edu
Science (New York, N.Y.)
|May 21, 2005
Summary
The 2004 Sumatra-Andaman earthquake and 2005 Nias earthquake, the largest in 40 years, revealed complex rupture processes. Subsequent plate slip decreased in speed northward, challenging seismological understanding.
Area of Science:
- Geophysics
- Seismology
- Earthquake Science
Background:
- The 2004 Sumatra-Andaman earthquake (Mw 9.3) and 2005 Nias earthquake (Mw 8.7) caused immense human tragedy.
- These events were the largest earthquakes globally in the preceding 40 years.
- The scale of these geological events presented significant challenges for seismological analysis.
Purpose of the Study:
- To analyze the complex rupture processes of the Sumatra-Andaman and Nias earthquakes.
- To investigate the application of new technologies in studying large-scale seismic events.
- To describe the geodynamics of the plate interface slip during these major earthquakes.
Main Methods:
- Analysis of seismic data from the Sumatra-Andaman and Nias earthquakes.
- Utilizing advanced technologies to study earthquake rupture dynamics.
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Main Results:
- The earthquakes exhibited a rupture process of surprising complexity.
- The initial rapid rupture was followed by a decrease in slip speed towards the north.
- New technologies were tested by the sensitivity and range required for these events.
Conclusions:
- The Sumatra-Andaman and Nias earthquakes highlight the complex nature of megathrust rupture.
- Understanding the decreasing northward slip speed is crucial for seismic hazard assessment.
- These events underscore the need for advanced monitoring and analysis tools in seismology.