## Kent Andersen

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Continue reading Saving Planet Earth A Practical Hands On Approach (1)

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It is difficult to explain an electrically charged conductor, just as it is hard to explain the speed of an electric current. The person is not harmed by touching this wall. Tools to decompose concave polygons, find convex hulls and boolean operations The Gravity Discovery Centre in Gingin is our public outreach facility playing a crucial role in the understanding of gravitational waves for all. All scientists should realise the importance of Principles, simply because logic deduced from Principles is necessary and certain.

Continue reading Saving Planet Earth A Practical Hands On Approach (1)

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P18.29 Now, consider the tension in the string. If the total current into a point were different from the total current out, then charge would be continuously created or annihilated at that point. Why bring down an empty building hours after the main attack? P12.49 FV + T sin 20.0°−10 000 N = 0 b g and FV = 10 000 N − T sin 20.0° = 8.26 × 10 3 N P12.50 Choosing the origin at R, (1) (2) (3) R ∑ Fx = + R sin 15.0°−T sin θ = 0 ∑ Fy = 700 − R cos 15.0°+T cos θ = 0 ∑ τ = −700 cos θ a0.180f + T b0.070 0g = 0 Solve the equations for θ from (3), T = 1 800 cos θ from (1), R = T 90° 15.0° 1 800 sin θ cos θ sin 15.0° 1 800 sin θ cos θ cos 15.0° Then (2) gives 700 − + 1 800 cos 2 θ = 0 sin 15.0° or θ cos 2 θ + 0.388 9 − 3.732 sin θ cos θ = 0 θ 18.0 cm 25.0 cm n FIG.

Continue reading The Day the Apple Bopped Darby on the Head: How Isaac learns

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There may be some aerodynamic drag on the inverted eggshell, but not enough to cause the shell and knife to separate much, and a little separation doesn't matter. A motor turns the top roller at a constant speed, and the remaining rollers are allowed to spin freely. The new Bullet 2.81 Physics SDK is released. Needless to say, gravity doesn't work like this in real life. P28.20 ε = 12.6 V We name currents I 1, I 2, and I 3 as shown. Because the nodes are drifting towards the surface of a planet they get progressively closer due to lateral shrinkage.

Continue reading Lecture Notes on the General Theory of Relativity: From

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If the velocity of the insect is v x, 40.4 = 40.0 a340 + 5.00fb340 − v g. a340 − 5.00fb340 + v g x x Solving, v x = 3.31 m s. The real estate agent's database has asteroids listed by mass, however, not by surface gravity. P31.9 218 P31.10 Faraday’s Law b g Φ B = µ 0 nI Asolenoid ε = −N dΦ B dI 2 = − Nµ 0 n π rsolenoid dt dt e e j g b600 A sg cosa120tf jb je ε = −15.0 4π × 10 −7 T ⋅ m A 1.00 × 10 3 m −1 π 0.020 0 m a f 2 ε = −14.2 cos 120 t mV P31.11 For a counterclockwise trip around the left-hand loop, with B = At a f d At 2 a 2 cos 0° − I 1 5 R − I PQ R = 0 dt e j and for the right-hand loop, a f d Ata 2 + I PQ R − I 2 3 R = 0 dt where I PQ = I 1 − I 2 is the upward current in QP. i Aa + I R = I a3 Rf 5 2 Aa − 6 RI − e Aa 3 2 and PQ 2 I PQ ε = 2 2 PQ I PQ = P31.12 j + I PQ R = 0 Aa 2 upward, and since R = 0.100 Ω m 0.650 m = 0.065 0 Ω 23 R b e1.00 × 10 = −3 b ja 23 0.065 0 Ω FG IJ H K f T s 0.650 m g f ga 2 = 283 µA upward. ∆Φ B dB A = N 0.010 0 + 0.080 0t A =N dt ∆t b g b g b fe j At t = 5.00 s, ε = 30.0 0.410 T s π 0.040 0 m P31.13 FIG.

Continue reading The Restless Universe Applications of Gravitational N-Body

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T T T 293 K 652 P22.53 Heat Engines, Entropy, and the Second Law of Thermodynamics H ET so if all the electric energy is converted into internal energy, the steady-state ∆t condition of the house is described by H ET = Q. P19.19 b a g f (a) V f = Vi 1 + β∆T = 100 1 + 1.50 × 10 −4 −15.0 = 99.8 mL (b) ∆Vacetone = βVi ∆T b b ∆Vflask = βVi ∆T g g acetone Pyrex b = 3αVi ∆T g Pyrex for same Vi, ∆T, ∆Vacetone β acetone 1.50 × 10 −4 1 = = = −6 ∆Vflask β flask 6.40 × 10 −2 3 3.20 × 10 e j The volume change of flask is about 6% of the change in the acetone’s volume.

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Since E =, r r r (b) r= 6.00 × 10 5 V V = = 0.200 m and E 3.00 × 10 6 V m (a) q= Vr = 13.3 µC ke Q max = a 6 Emax r 2 3.00 × 10 0.150 = ke 8.99 × 10 9 f 2 = 7.51 µC Chapter 25 67 Additional Problems P25.53 q q U = qV = k e 1 2 = 8.99 × 10 9 r12 P25.54 (a) e a38fa54f 1.60 × 10 j a5.50 +e6.20f × 10 j −19 2 −15 = 4.04 × 10 −11 J = 253 MeV To make a spark 5 mm long in dry air between flat metal plates requires potential difference e je j ∆V = Ed = 3 × 10 6 V m 5 × 10 −3 m = 1.5 × 10 4 V ~ 10 4 V.

Continue reading Gravity: An Introduction to Einstein's General Relativity

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The problem with entropy is that it’s defined in terms of energy and temperature, which are measured based on some external reference such as a thermometer. All the matter falling in gets homogenized into nothingness, leaving behind nothing but warped spacetime geometry. Patience is key as you build bridges to save your little friends. But the energy that temporarily maintains a current in a coil after the battery is removed is not energy that belongs to any bit of matter.

Continue reading Quantum Field Theory on Curved Spacetimes: Concepts and

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This idealized model of gravitational interaction can be applied in most practical applications, although in some more esoteric situations such as a non-uniform gravitational field, further care may be necessary for the sake of precision. We farm boys used to make goose-feather whistles. When the student fails to get any water out of the flask, the instructor might remark, "Jim is not as big a sucker as we thought." After considering how branes collide and vibrate, it appeared there had to be a direct method of energy transfer from each membrane to the new universe at the fundamental level of each string.

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B) buy at a low altitude and sell at a high altitude. The resulting acceleration of the Earth due to this impulse is significantly smaller than your acceleration forward, but the planet’s backward momentum is equal in magnitude to your forward momentum. Because what this means is that when we’re on our own planet, we’re feeling gravitational forces coming from the moon, from the sun, from Jupiter… and also from stars billions and billions of kilometers away, and even from distant galaxies, at distances so large that they’re beyond our imaginations.

Continue reading Teleparallel Gravity: An Introduction (Fundamental Theories

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They’re posted here for you to enjoy … and it’s my conviction that a big part of enjoyment is learning … really learning, so you have a gut feel for what you’ve learned. They wondered whether the amplitude was “the answer to some particular mathematical question,” said Trnka, a post-doctoral researcher at the California Institute of Technology. “And it is,” he said. PS: Sorry if i dont make sense, i do not have ... Here a new, revolutionary "space laboratory" has been obtained for testing Einstein's general theory of relativity and alternative theories of gravity.