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Order of Magnitude and Estimation
Order of Magnitude and Estimation

PHYSICS FORCES TEST REVIEW WORKSHEET
PHYSICS FORCES TEST REVIEW WORKSHEET

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General Physics Contest 2010 May 22, 2010 (9:10

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... all other mass. This is the rst time the concept of gravity was extended beyond the earth to include planets, moons, and stars. Through careful measurements, he was able to show that the force causing the curved path of the moon was the same as the force causing objects to fall to the earth. Newton ...
Exam #: Printed Name: Signature: PHYSICS DEPARTMENT
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... Suppose a particle with charge q and mass m moves with velocity vector v. If a force F acts in the same direction as the velocity v then the particle continues to move in the same direction, but it speeds up. This is what an electric field can do to charged particles. We can describe it a bit differ ...
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Equations of Stellar Structure Stellar structure and evolution can be

... Consider the net energy per second passing outward through a shell at radius r. If no energy is created in the shell, then the amount of energy in equals the amount of energy out, and dL/dr = 0. However, if additional energy is released or absorbed within the shell, then dL/dr will be non-zero. Let’ ...
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... We have defined gravitational potential Φ as the work which must be done against the force of gravity per unit mass to slowly remove an object to an infinite distance. This is always expressed as a negative quantity. When a mass m falls from a height with a gravitational potential Φ to a height with ...
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... 3. (a) A proton of mass 1.0 u traveling with a speed of 2104 m/s has an elastic head-on collision with a helium nucleus of mass 4.0 u initially at rest. The velocity of the proton after the collision is vP=_________ m/s. (b) If these two particles are observed to move off at 45, proton above the x ...
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Negative mass

In theoretical physics, negative mass is a hypothetical concept of matter whose mass is of opposite sign to the mass of normal matter, e.g. −2 kg. Such matter would violate one or more energy conditions and show some strange properties, stemming from the ambiguity as to whether attraction should refer to force or the oppositely oriented acceleration for negative mass. It is used in certain speculative theories, such as on the construction of wormholes. The closest known real representative of such exotic matter is a region of pseudo-negative pressure density produced by the Casimir effect. Although general relativity well describes gravity and the laws of motion for both positive and negative energy particles, hence negative mass, it does not include the other fundamental forces. On the other hand, although the Standard Model well describes elementary particles and the other fundamental forces, it does not include gravity, even though gravity is intimately involved in the origin of mass and inertia. A model that explicitly includes gravity along with the other fundamental forces may be needed for a better understanding of the concept of negative mass.
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