Laws Definition and 1000 Threads

around 3:00 minutes into the video neil says that all the laws of physics can be simplified into one formula, which formula is this? is it e=mc^2? the video

Homework Statement A painter is statically at rest on a ladder leaning against a wall. The painter argues that the force on the painter by the ladder must be equal and opposite to the force of gravity on the painter by the Earth. Evaluate the painters argument.The Attempt at a Solution the...

Have you ever used the Ideal Gas Law, Charles' Law, Boyls' Law, or the Combined Gas Law for anything in electrical engineering?

I'm nearing the end of AP Chemistry, and in review for the big test I came across my old friend, Chemical Kinetics. Also being near the end of Precalculus, the "differential" and "integral" laws piqued my interest. Remembering that I have not taken any Calculus lessons, can someone help...

http://www.smh.com.au/world/antiabortion-bill-to-block-foetal-test-results-20100421-szqu.html" Withholding test results from patients? Publishing patient information online? Forcing procedures and propaganda on patients? Is this constitutional? I know it's not ethical, it violates both...

Homework Statement The coefficient of friction between the block of mass m1 = 3.00 kg and the surface in the figure below is μk = 0.335. The system starts from rest. What is the speed of the ball of mass m2 = 5.00 kg when it has fallen a distance h = 1.45 m? Homework Equations...

I'm a bit confused about how the Lorentz Force (as a law) stands in relation to the laws of Maxwell (independent of each other? dependent?). There are two concrete examples I can think of where they interfere with each other: 1: Lorentz Force & Faraday's Law of Induction Imagine a...

i know the law (fg)'=f'g+fg' but here there is epsilon and it turns to someother sign i don't know what it says. i can't understand the transition ?

Okay, so I've been trying to wrack my brain around this concept for a while but to no avail. PV = nRT (Preal + n2*V-2a)(Vreal - nb) = nRT From these equations, it's clear that real volume is greater than ideal volume under real conditions. I understand that this is because the molecules...

A bullet of mass 20g strikes a fixed block of wood at a speed of 320 m/s. The bullet embeds itself in the block of wood, penetrating to a depth of 6.0 cm. Calculate the average net force acting on the bullet while it is being brought to rest

Homework Statement Sam, whose mass is 75 kg, straps on his skis and starts down a 50-m-high, 20 degree frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies. Find his speed at the bottom of the slope using Newton's Law Find his speed at the bottom...

Homework Statement To find the stiffness of a material, a block of that material is placed 30 cm under a metallic cone with 0.3 kg; the cone is free falling from rest, penetrating a distance x in the block until it stops. It is known that when the cone penetrates in the block the force of the...

Homework Statement The reaction S2O82- + 3 I-1 -> 2 SO42- + I3-1 is first order in both reactants. The following mechanism is proposed: I-1 + S2O82- -> IS2O83- IS2O83- -> 2 SO42- + I+ I+ + I-1 -> I2 I2 +I-1 -> I3-1 a) Which step is the rate determining step? b) Show that this...

Homework Statement Block A in the figure weighs 65.9N. The coefficient of static friction between the block and the surface on which it rests is 0.27. The weight w is 12.2N and the system is in equilibrium. block A is placed on a table, it is connected by a string to a wall block w is...

Homework Statement I've gone out and measured my changing weight in an elevator using a bathroom scale, taking measurements each second, with the elevator ascending 4 storeys. I am wondering if it is possible to work out the acceleration of the elevator from these results, and if so how they...

1. Which of the following relationships must be true according to the laws of series and parallel connections? The options are: I1 = I3 I3 = I4 I2 = I3 + I4 I1 = I3 + I2 V1 = V2 V3 = V4 V1 = V3 + V4 V2 = V3 + V4 V1 = V2 + V3 + V4 2. Loop and junction laws 3. By the...

http://wadvpress.org/?p=58 http://docs.dads-house.org/Statutory_Rape_Victims_Must_Pay_Child_Support.pdf Only in America could a guy get raped and have to pay the child support too.

While refreshing some thermodynamics for a personal interest in renewable energies, I drafted a reasoning that apparently leads from the 1st law to the 2nd law of thermodynamics, so that the latter, at least for ideal gases undergoing reversible processess, would seem to be just a consequence of...

I had this discussion about the differences between hypotheses, theories, and laws in my physical science class today, and I suddenly remembered the principles I had learned about in physics (e.g. Bernoulli's principle, Pauli exclusion principle). I was curious how principles fit into this whole...

Homework Statement near-field distance attenuation follows an inverse cube law (1/d^3), while in the far-field it follows inverse law (1/d). Prove mathematically how we arrive at 60dB/decade from the inverse distance cube relation and 20dB/decade from the inverse distance relation...

Hi guys I am new with physics and having a hard time wraping my head around things. A worker pulls horizontally on a rope that is attached to a 10-kg crate resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3, respectively. The worker pulls with a force...

NOTE Newtons first law does NOT seem to work here, at the object does NOT keep moving at a constant speed, it actually stops. Am I missing somthing ? Wayne

Here is a copy of my notes on the motor. Basically it's just some of Newton's Law of Rotation combined with Kirchoff's Laws. Then we put the model into state space form. Could someone just please explain to me the meaning of the equations? It's been a while since I've had physics. Thanks a...

Homework Statement The 100 kg blcok in the figure takes 5.40 s to reach the floor after being released from rest. What is the mass of the block on the left? Homework Equations F=ma sf=si + (1/2)(a)(delta t) The Attempt at a Solution I know to find acceleration you use sf=si +...

Homework Statement To move a large crate across a rough floor, you push on it with a force F at an angle of 21°, below the horizontal. Find the acceleration of the crate, given that the mass of the crate is m = 28 kg, the applied force is 322 N and the coefficient of kinetic friction between...

Homework Statement Find θ and W in the figure below where w1 = 16.0 N, w2 = 25.0 N, and α = 66.5°, assuming that the arrangement is at rest. Homework Equations T_1=25/sin(alpha) F_x=-T_1cos(alpha)+T_2cos(theta) F_y=T_1sin(alpha)+T_2sin(theta)-2 The Attempt at a Solution I tried to...

Homework Statement A 1420 kg jet engine is fastened to the fuselage of a passenger jet by just three bolts (this is the usual practice). Assume that each bolt supports one-third of the load. (a) Calculate the force on each bolt as the plane waits on line for clearance to take off. (b)...

Homework Statement Suppose an aerosol can contains a residual pressure of 755mm Hg and a temperature of 25*c. What would the pressure be if the can was heated to 1155*c? Homework Equations P1xV1=P2xV2 V\proptoT The Attempt at a Solution I began by converting the 755mm Hg...

Calculate the current in each of the resistors and indictate the direction of current flow. what is the potential difference between A & B I have attached the circuit & labelled the the circuit directions using kirchhoffs laws - 1) i3 = i1+i2 FOR THE LOOP AFEBCD 2)...

I think Markopoulou and Oriti have been sniffing this out a long time. Note that Wen has heuristically linked tensor networks and AdS/CFT (strings!) in the final slide of http://dao.mit.edu/~wen/talks/09QHtop.pdf. http://arxiv.org/abs/0907.2994 Tensor network decompositions in the presence...

Hi, it is known that all bodies moving with a velocity will remain moving with a constant velocity unless a force is applied to a body. (according to Newton's laws). But I thought about this: F = Ma. But if we had a very very very very small object (hypothetically), we could virtually take...

\int_{0}^{\infty}fdx\int_{\frac{x-tx}{t}}^{\infty}dy=\int_{0}^{\infty}dx\int_{\frac{x-tx}{t}}^{\infty}fdy f is a function of x and y can i move f like i showed? can i change the order of integration ?

Homework Statement A 5.10 kg instrument is hanging by a vertical wire inside a spaceship that is blasting off at the surface of the earth. This ship starts from rest and reaches an altitude of 290 m in 10.0 s with constant acceleration. a.) Draw a free-body diagram for the instrument...

1. Homework Statement and attempted solutions Simply each of the following Boolean expressions: i) http://img69.imageshack.us/img69/4438/equa1.jpg ii) http://img69.imageshack.us/img69/9907/equa2.jpg iii)Expand the following SOP form to proper miniterms (don't forget to delete...

Personally I'm on the border-line between atheist and agnostic however the following statement gets me thinking. It is a statement that every physicist can resite without having to think; "Every object remains in a state of rest or in uniform motion until acted on by an external force"...

I need to show that P<->Q is logically equivalent to ( P ^ Q ) v ( ~P ^ ~Q) So far I have P <-> Q is equivalent to ( ~P v Q ) ^ ( ~Q v P ) by a example I have no idea where to go from here

14. According to Newton’s _____ law, an object with no net force acting on it remains at rest or in motion with a constant velocity. A. Third B. Fourth C. Second D. First (for this question I related it to the concept of Newtons first law) Is this correct

http://i49.tinypic.com/1yu634.jpg this is a part of the solution " the is a voltage drop on capacitor C1 which makes current shock on C1 and a current shock on R2 and R3 and it makes a KVL contradiction on the right branch and the outer branch. and that's why the continuety laws...

How does inverse square law of gravity relate to the inverse square law of electromagnetic radiation (e.g. illumination)? How come gravity and EMR propagate identically even though they are different forces?

Newton's laws cannot be proven! As far as i know, Newtons laws are... 1st Law-- A body at remains at rest and a body at uniform motion remains at uniform motion unless an external for acts on it. 2nd Law-- F=ma 3rd Law-- Every action has an equal and opposite reaction. No method has...

In this text is explained why our universe exists and why there are nature’s laws. The explanation is given in two parts: Part 1: Why does our universe exist? Part 2: Why does nature’s laws exist? The explanation uses concrete examples, to make the text as comprehensible as possible. At the...

Homework Statement Hi there, I just want to see if I am doing these questions correctly. Any help with this would be great. The question and circuit diagram are in the attachment. CheersHomework Equations Kirchoff's Laws for voltage and current. I'm not too sure if there is an equation, you...

Not a homework question, but I am trying to understand some stuff in Leibniz's 17th century "natural philosophy" which got me realizing that I don't have a clear grasp of my high school physics from 40 years ago. Imagine a closed system consisting of 2 objects, and imagine a perfect elastic...

Homework Statement A person pushes a 14.0-kg lawn mower at constant speed with a force of F= 88.0N directed along the handle, which is set at an angle of 45 degrees to the horizontal. (a) Draw the free-body diagram showing all forces acting on the mower. Calculate (b) the horizontal friction...

Homework Statement A person stands on a scale on an elevator. If the mass of the person is 96.34 kg and the elevator travels upward at a constant speed of 4.42 m/s, what is the reading on the scale? Homework Equations m = 96.34 kg V avg = 4.42 m/s The Attempt at a Solution I...

Homework Statement Say I have a circuit that splits into three parallel wires. They each have a resistors on them of 2, 3, and 4 ohms respectively. They reconnect and their final current is 10 Amps. Is there a more intuitive way to find the current on each wire based on the ratios of ohms...

Hi all, I've been recently digging into SR in my attempts to better understand electromagnetics. One thing that has been giving me trouble is the force transformation laws, which seem to give rise to some pretty gnarly paradoxes, one of which I've listed here: Consider two objects, where...

Homework Statement 8. (II) A car can decelrate at -4.80 m/s^2 without skidding when coming to rest on a level road. What would its decelration be if the road were inclined at 13 degrees uphill? Assume the same static friction force. Homework Equations Ffr = MuFn F = ma The...

I'm new to studying physics. Are the laws of nature and the laws of physics synonymous with each other? Thanks!

I've argued in other threads in this and other forums against strict determinism (non probabilistic) on philosophical grounds. The probabilistic formulation of quantum mechanics is still the standard view, but it seems to irritate some who post in PF. They would seek a fully deterministic theory...