Laws Definition and 1000 Threads

Assuming a machine such that it produces blocks of negative and positive mass from vacum, and it uses the produced positive mass to power all these procedure such that it forms a perpetrual motion machine. would it be theoredcally posible to do this with the positive mass produced in the...

Homework Statement CxHy gets burned in oxygen gas and makes CO2 and water. Given the partial pressure of water and the total pressure of the resulting mixture I need to find the empirical formula. Homework Equations Well PV=nRT is the obvious choice...but all the information you see...

A 20000 rocket has a rocket motor that generates 3.0×105 of thrust. What is the rocket's initial upward acceleration? Express your answer using two significant figures. At an altitude of 5.0 km the rocket's acceleration has increased to 6.0 m/s^2 . What mass of fuel has it burned...

how large is the normal force? (applying Newtons laws phys 1111) A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, kinetic friction, and a horizontal rope exerting a 30 N force as shown in the...

Homework Statement The circuit in the figure is composed of two batteries (ε1 = 10 V and ε2 = 5 V) and four resistors (R1 = 110 Ω, R2 = 40 Ω, R3 = 40 Ω, and R4 = 50 Ω) as shown. HELP: Because of the presence of batteries in more than one branch of the circuit, parts (a) and (b) of this...

How can I prove <by induction> the following De Morgan laws are valid for all n >= 2 - ( P(d1) ^ ... ^ P(dn) ) = ( - P(d1) ) v ... v ( - P(dn) ) knowing that -(p^q)=(-p)v(-q) and -((p)v(q))=(-p)^(-q) ? I can use the inductive proof method on algebra/math theorems that have to do with...

(Please make it a bit easy for a newbie student) Law of Conservation of Energy states that energy can neither be created nor be destroyed. Then how did it ever come into being? Thanks

Homework Statement A force of 38.64 N pushes and pulls two blocks as shown in the figure below. The vertical contact surfaces between the two blocks are frictionless. The contact between the blocks and the horizontal surface has a coefficient of friction of 0.18. The acceleration of...

1. Define Newton's 1st, 2nd, and 3rd laws and give examples of each 2. How can you change from weight to mass and back with correct units? 3. Explain free fall - tell what happens when a feather and a hammer and dropped at the same height and why this happens

Homework Statement The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. Block 1 has mass m1 = 0.900 kg; block 2 has mass m2 = 2.70 kg. What is the tension in the...

Homework Statement Part 1 Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.03 kg, M2 = 3.40 kg, and F = 5.10 N, find the size of the contact force between the two blocks...

According to Kirchoff's first law for electrical circuits V=RI+L(dI/dt) where constants V, R and L denote the electromotive force, the resistance, and the inductance, respectively, and I denotes the current at time t. If the electromotive force is terminated at time t=0 and if the current is...

Suppose the cord in Fig. 4-22 is a heavy rope of mass 1.0 kg. Calculate the acceleration of each box and the tension at each end of the cord, using the free-body diagrams shown in Fig. 4-46. Assume the cord doesn't sag. (m1 = 10.5 kg , m2 = 12.5 kg and FP = 35.0 N) m1 stands for the mass of...

Homework Statement two identical cells of emf E and internal resistance r are connected in series. a 7 ohm resistor is connected across the combination and draws a current of 0.333A. the two cells are now connected in parallel; the 7 ohm resistor now draws a current of 0.375A from the...

1. A car coasts (engine off) up a 30 degree grade. If the speed of the car is 25 m/s at the bottom of the grade, what is the distance traveled before it comes to a rest? 2. mostly my class so far has dealt with equations calculating work and force by drawinf free body diagrams and using...

Laws only seem to go so far in getting people not to commit crimes against each other. I believe it has already been studied and established that the role of punishment to make an example as prevention is negligible. People who do not commit crimes because of the law are people living in fear...

"It's the planet that really shouldn't exist – or at least not for long. It is 10 times the size of Jupiter, orbits its own star in under 24 hours and should soon be spiralling into the surface of its searingly-hot sun..." Full story...

Homework Statement 1) A freight train has a mass of 1.5 x 10^7 kg. If the locomotive can exert a constant pull of 7.5 x 10^5 N, how long does it take to increase the speed of the train from rest to 80 km/h? 2) A 5.0 g bullet leaves the muzzle of a rifle with a speed of 320 m/s. What force...

For the free photon-field: Z[J]=exp(\frac{i}{2} \int d^4x \int d^4y J^\mu(x)\Delta_{\mu \nu}} (x-y) J^\nu(y)) where \Delta_{\mu \nu}}=g_{\mu \nu}/(k^2-i\epsilon) is the free-photon propagator. This leads to Coloumb's law for the electrostatic energy between two charges at x_1 and x_2 when...

I was recently taught about the three gas laws: 1)Boyle's Law, which stated that pressure is inversely proportional to volume and vice-versa at a constant temperature. 2)Charle's Law, which stated that volume is directly proportional to temperature at a a constant pressure...

This is a line of thought arising out of quantum physics – specifically, from the principle that to the extent something is not actually measured or observed, it can best be described as a superposition of all its possibilities. A simple scenario for how the world began: Suppose we...

Homework Statement A 4.0-kg toboggan rests on a frictionless icy surface, and a 2.0 kg block rests on top of the toboggan. The coefficient of static friction µs between the block and the surface of the toboggan is 0.60, whereas the kinetic friction coefficient is 0.51. The block is pulled...

Homework Statement A 4.1-kg box is pushed along a horizontal floor by a force of magnitude 21 N at an angle θ = 35° with the horizontal. If the coefficient of kinetic friction between the block and the floor is 0.20, calculate the acceleration of the box. Be careful when calculating the...

I need to solve for t and it's slipped my mind how to manipulate this. \frac{1}{4}=te^{-8t} to ln(1/4)=lnt-8t I understand the laws of logs (I think), but I still can't seem to isolate the t.

I'm having a hard time with understanding this

Homework Statement A cup of coffee is sitting on a table in an airplane that is flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.30. Suddenly, the plane accelerates, its altitude remaining constant. What is the maximum...

Homework Statement A train consists of of 50 cars, each of which has a mass of 6800 kg. The train's acceleration = 0.08 m/s(squared). Ignore friction and determine the tension in the coupling (a) between the 30th and 31st cars and (b) between the 49th and 50th cars. Homework Equations Net...

Homework Statement A large gun accelerates a 5.0 kg mass from rest to a speed of 4000 m/s into orbit. The net force accelerating the bullet is 490,000 N. How long will it take the projectile to come up to speed? It doesn't say anything above air resistance or gravity. Homework Equations...

Homework Statement A particle is traveling in a straight line at a constant speed of 24.5 m/s. Suddenly, a constant force of 14.3 N acts on it, bringing it to a stop in a distance of 52.9 m. a. Determine the time it takes for the particle to come to a stop. b. What is its mass? Homework...

Last time people concluded that 'I proved the law of conservation of energy and momentum wrong by my invention'...but the reality is strictly opposite. If this invention DOES NOT work THEN then 2 laws are wrong. This invention follows all rules and regulation governed by the physics book...

The following is something i read, and attempt to reproduce. I made no claim for originality. For anyone that wants the title of the book, and page number. I will find it, and post it. ( I remember the author is an adjunt professor at rockefeller university) The universe U is a computer...

Homework Statement For a birthday gift, you and some friends take a hot-air balloon ride. One friend is late, so the balloon floats a couple of feet off the ground as you wait. Before this person arrives, the combined weight of the basket and people is 1220 kg , and the balloon is neutrally...

When two people push in the same direction on an object of mass {\rm m} they cause an acceleration of magnitude a_1. When the same people push in opposite directions, the acceleration of the object has a magnitude a_2. Determine the magnitude of the force exerted by each of the two people in...

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I'm trying to figure out these two problems and I'm so lost! 1. Two planets are circling a star. The second planet has an orbit 4 times the size of the first planet. By the time the first planet revolves once, how many times the second one will? My solution: the formula is T=2PiR/v... so...

Hi all Why do we actually say that Newton's laws do not hold for non inertial frames. can you folks give me an example of how Newton's laws collapse in an non inertial frame(if they do at all)

Hi all, I'm trying to get my head round how to apply Newtons laws and an exercise like a bench press, probably a bit simple to what you guys are used to. I want to make it as simple as possible to understand what forces would be acting during the eccentric phase of an exercise, I.e lowering...

Homework Statement In the figure, a crate of mass m = 96 kg is pushed at a constant speed up a frictionless ramp (θ = 27°) by a horizontal force F. The positive direction of an x-axis is up the ramp, and the positive direction of a y-axis is perpendicular to the ramp. (a) What is the magnitude...

I kinda need help on this question because i can't find any article or references and please explain how the 3rd law related to safety devices in cars. Question: Access the design and use of injury prevention devices in cars in terms of Newton's laws of motion.

I know that the first law states that matter is can't be created or destroyed but in the second it mentions that the universe is moving towards entropy. But does not the universe have a moment of creation and if that is the case then what would you say the matter would have been before the...

This may be a stupid question or have a pretty obvious answer, but I can't seem to find one so I'll just go ahead and post :) I was looking at some empirical data for relationships defining (abstracted) values for ionization and recomination coefficients in gases as a function of electric...

Is Geography a science? It is comprised of theories, Laws (well Rules realy), hypothesis, some Math equations, aspects of Physics Chemistry and Biology. Also there is still much to be learned from it.

Perpetual motion idea: Sit on a bench with a collimated laser, single slit and detector screen. This prepares particles with identical and symmetric spatial wave-functions, so each measurement transfers an independent, random quantity of transverse momentum (from a symmetric distribution) to...

Homework Statement A box is given an initial velocity of 5m/s up a smooth 20 incline surface . The distance the box travel before coming to rest is? Homework Equations I can't solve it correctly , I can't get the idea of this question The Attempt at a Solution x= ? vi=5 v=0...

hello,I read on this recently and a questions is running in my head , here it is: the laws of the universe all seem to be made so the universe can host life, change just one or a few(lets say more antimatter than matter) and the universe would be without life and observers, this leads me to an...

Hello. I am doing an end of the year presentation/project for calculus BC class, and I was considering examining orbital motion and Kepler's laws in terms of basic calculus. So far I have been reading this site: http://www.alcyone.com/max/physics/kepler/index.html Does anyone have any...

the proposition is that if r(t) has a constant length (//r(t)// is constant), then prove that r(t) is perpendicular to dr/dt at all t. I was thinking that if r(t) is just a function of the radius and its magnitude //r// is constant, then its basically talking about a circle? and by saying...

Homework Statement Prove De Morgan's Laws (only (A U B)' = A' n B' part) Homework Equations (A U B)' = A' n B' The Attempt at a Solution I used this x does not belong to (A U B) x belongs to A' and B' x belongs to A' n B' now opposite x belongs to A' n B' x belogns to...

Homework Statement A person on a snow sled(total mass of 60.0kg) starts from rest at a vertical height of 24.0m above the bottem of the hill. If aconstant frictional force of 70.0 N opposes their motion as they slide down the hill and the length of the slope is 65.0m, whta is their speedat the...

Homework Statement Here is the question: http://img93.imageshack.us/img93/9159/snap1k.jpg Homework Equations First law: Q=W+U Second law: no thermodynamic system can convert heat into work 100%; heat flows from hot to cold reservoirs spontaneously; entropy always increases The...