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MATH 280: Applied Differential Equations Quiz 3
MATH 280: Applied Differential Equations Quiz 3

answer
answer

... (b) What is the sign of the charge on the particle? Justify your answer. ...
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... • Work is defined as the action of applying a force acting over some distance. Work can not be done if no energy is available. ...
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MASSACHUSETTS INSTITUTE OF TECHNOLOGY  DEPARTMENT OF PHYSICS
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... 1. A larger force applies a greater torque than a smaller force, if they act at the same location. 2. A force that causes an object to accelerate in the negative direction does negative work. 3. A 20 N force applied 20 cm from the pivot will create the same torque as a 40 N force applied 10 cm from ...
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... 4) A charge –q is to be placed at either point A or point B in the figure below. Assume points A and B lie on a line that is midway between the two positive charges. Is the magnitude of the net force experienced at point A (a) greater than, (b) equal to, or (c) less than the net force experienced at ...
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... • Gravity- the force that pulls objects towards the Earth • Free fall- when the only force acting on an object is gravity – ALL objects in free fall will fall at the same rate of 9.3m/s2 – If you drop a bowling ball and a tennis ball off a building, which one will hit the ground first??? ...
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Homework 4 - UCLA Astronomy
Homework 4 - UCLA Astronomy

Slide 1
Slide 1

< 1 ... 74 75 76 77 78 79 80 81 82 ... 90 >

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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