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biomechanics2008
... What happens to the distance achieved with a topspin shot compared to one with backspin? A topspin shot gives poorer distance compared to backspin. 1. Range is decreased with topspin 2. Range is increased with backspin What will happen with a backspin shot? A region of high pressure (H) is created u ...
... What happens to the distance achieved with a topspin shot compared to one with backspin? A topspin shot gives poorer distance compared to backspin. 1. Range is decreased with topspin 2. Range is increased with backspin What will happen with a backspin shot? A region of high pressure (H) is created u ...
Physics Final
... to gravity is 1.62m/s2 on the moon; how long does it take the feather to reach the ground? ...
... to gravity is 1.62m/s2 on the moon; how long does it take the feather to reach the ground? ...
Circular Motion
... tied at the end of a string and Let us find the minimum velocity the body whirled in a vertical circle of should possess at the lowest point in order to just loop the vertical circle. A/Q to radius r. let v1 and v2 be the principle of conservation of energy, velocities of the body and T and T be t ...
... tied at the end of a string and Let us find the minimum velocity the body whirled in a vertical circle of should possess at the lowest point in order to just loop the vertical circle. A/Q to radius r. let v1 and v2 be the principle of conservation of energy, velocities of the body and T and T be t ...
Weeks_4
... Remark 15: A mechanical system is integrable if you can express the state as a function of time (even an non-elementary function). This requires constants of motion (such as angular momentum) and is a very special condition. In very special cases additional constants of motion exist that ensure clos ...
... Remark 15: A mechanical system is integrable if you can express the state as a function of time (even an non-elementary function). This requires constants of motion (such as angular momentum) and is a very special condition. In very special cases additional constants of motion exist that ensure clos ...
Lecture 2 Newton`s laws of motion
... Lecture 2 Newton's laws of motion Momentum When explaining changes in motion, it is necessary to consider the mass of the object as well as the velocity. Imagine an unknown object is moving really fast towards you, say at a speed of 20 m/s or 72 km/h. You probably would choose to get out of the way, ...
... Lecture 2 Newton's laws of motion Momentum When explaining changes in motion, it is necessary to consider the mass of the object as well as the velocity. Imagine an unknown object is moving really fast towards you, say at a speed of 20 m/s or 72 km/h. You probably would choose to get out of the way, ...
Chapter 8: Rotational Motion of Solid Objects 1. An isolated object is
... D. The linear speed is the same for all three horses. Answer: C 4. A sphere and a hoop have the same diameter and the same mass. If they are released from rest at the top of an incline, which will reach the bottom more quickly? A. The sphere. B. The hoop. C. Both will require the same time to reach ...
... D. The linear speed is the same for all three horses. Answer: C 4. A sphere and a hoop have the same diameter and the same mass. If they are released from rest at the top of an incline, which will reach the bottom more quickly? A. The sphere. B. The hoop. C. Both will require the same time to reach ...
Relativity4
... As we have learned, mass is a form of potential energy. It can be converted into energy, or energy can be converted into mass. Because of this, mass does not have to be conserved in reactions. If you throw two balls at each other and they stick together (an inelastic collision), the resulting mass i ...
... As we have learned, mass is a form of potential energy. It can be converted into energy, or energy can be converted into mass. Because of this, mass does not have to be conserved in reactions. If you throw two balls at each other and they stick together (an inelastic collision), the resulting mass i ...
Lesson - nstacommunities.org
... energy. Ask students to critically analyze the video’s definition of force (the push or pull that can accelerate an object by changing its velocity or changing its shape) and suggest how it might be improved. Guide them to realize that the original definition implies that changing the shape of an ob ...
... energy. Ask students to critically analyze the video’s definition of force (the push or pull that can accelerate an object by changing its velocity or changing its shape) and suggest how it might be improved. Guide them to realize that the original definition implies that changing the shape of an ob ...
Relativistic angular momentum
""Angular momentum tensor"" redirects to here.In physics, relativistic angular momentum refers to the mathematical formalisms and physical concepts that define angular momentum in special relativity (SR) and general relativity (GR). The relativistic quantity is subtly different from the three-dimensional quantity in classical mechanics.Angular momentum is a dynamical quantity derived from position and momentum, and is important; angular momentum is a measure of an object's ""amount of rotational motion"" and resistance to stop rotating. Also, in the same way momentum conservation corresponds to translational symmetry, angular momentum conservation corresponds to rotational symmetry – the connection between symmetries and conservation laws is made by Noether's theorem. While these concepts were originally discovered in classical mechanics – they are also true and significant in special and general relativity. In terms of abstract algebra; the invariance of angular momentum, four-momentum, and other symmetries in spacetime, are described by the Poincaré group and Lorentz group.Physical quantities which remain separate in classical physics are naturally combined in SR and GR by enforcing the postulates of relativity, an appealing characteristic. Most notably; space and time coordinates combine into the four-position, and energy and momentum combine into the four-momentum. These four-vectors depend on the frame of reference used, and change under Lorentz transformations to other inertial frames or accelerated frames.Relativistic angular momentum is less obvious. The classical definition of angular momentum is the cross product of position x with momentum p to obtain a pseudovector x×p, or alternatively as the exterior product to obtain a second order antisymmetric tensor x∧p. What does this combine with, if anything? There is another vector quantity not often discussed – it is the time-varying moment of mass (not the moment of inertia) related to the boost of the centre of mass of the system, and this combines with the classical angular momentum to form an antisymmetric tensor of second order. For rotating mass–energy distributions (such as gyroscopes, planets, stars, and black holes) instead of point-like particles, the angular momentum tensor is expressed in terms of the stress–energy tensor of the rotating object.In special relativity alone, in the rest frame of a spinning object; there is an intrinsic angular momentum analogous to the ""spin"" in quantum mechanics and relativistic quantum mechanics, although for an extended body rather than a point particle. In relativistic quantum mechanics, elementary particles have spin and this is an additional contribution to the orbital angular momentum operator, yielding the total angular momentum tensor operator. In any case, the intrinsic ""spin"" addition to the orbital angular momentum of an object can be expressed in terms of the Pauli–Lubanski pseudovector.