Laws Definition and 1000 Threads

So back in my parents house if I had a friend over that my parents did not want over they could ask the person to leave. If the person didn't leave it would trespassing (despite me wanting my friend over). Yes? So how does the whole situation work out when you share a space with someone...

I was reading an article and it said that eventually, when you get silicon transistors to a certain size, they won't be able to operate anymore and will end up melting. I have always wondered the following... what is the point of trying to make transistors smaller when we can just make the...

Hi, Homework Statement A coin is tossed three times. I am asked for the probability that EITHER the first toss yields heads, OR the second toss yields tails, OR the third yields heads. I am expected to use De Morgan's Laws but am not sure how to define the events the themselves. I'd...

Homework Statement Three resistors, R1 = 27 Ω, R2 = 42 Ω, and R3 = 53 Ω, are connected in a multiloop circuit, as shown in the figure. Determine the amount of power dissipated in the three resistors. Homework Equations Junction Rule Loop Rule The Attempt at a Solution I...

i am having problem getting the dθ in the laws of area. what the textbook states is, dθ= xdy-ydx x2+y2 I can't get the equation.. the only thing i could think of is trigo functions, but i got stuck... any help?

Homework Statement Show that the following can be expressed as a quadratic equation 2^{x}-1 = \frac{2}{2^{x}}Homework Equations Show that the quadratic has only one real solution at x = 1 The Attempt at a Solution Well, my biggest problem is the main part of the task, converting the equation...

Homework Statement Simplify; expressing with positive indices. \frac{x^{-2} - y^{-2}}{x^{-1} - y^{-1}} The Attempt at a Solution Hello, I'm doing first year uni math and over the holidays, I forgotten my index laws and as a result I'm stuck on this question :rolleyes: I know that...

http://i883.photobucket.com/albums/ac32/trebaby85/IMAG0170_zpsde7b54b0.jpg I know I have to use Kirchoffs law but how would I apply it to this question. I honestly have no idea where to start.

Homework Statement http://i.imgur.com/sPN07Hi.png Homework Equations Newton's laws of motion. The Attempt at a Solution I split up the entire thing into two pieces. http://imgur.com/dMxfCZM The left diagram illustrates the left block of 3 kg. I set the x-axis parallel to...

Homework Statement "A 1130-kg car is held in place by a light cable on a very smooth (frictionless) ramp. The cable makes an angle of 31 degrees above the surface of the ramp, and the ramp itself rises at 25 degrees above the horizontal. (a) Find the tension in the cable. (b) How hard does...

So are Newton's laws also an approximation to quantum phenomena. Can it be derived from quantum laws?

Homework Statement As a prank, your friends have kidnapped you in your sleep, and transported you out onto the ice covering a local pond. Since you're an engineer, the first thing you do when you wake up is drill a small hole in the ice and estimate the ice to be 6.7cm thick and the distance...

So I am studying the laws of Newton and I am wondering,are there any deficiencies related to the laws?I mean,somewhere where I can't use them or anything?

Homework Statement A picture frame hung against a wall is suspended by two wires attached to its upper corners. If the two wires make the same angle with the vertical, what must this angle be if the tension in each wire is equal to 0.75 of the weight of the frame. Ignore any friction between...

Duct Tape Challenge In this lab you and your group members will duct tape one of your members onto a wall using ONLY duct tape. The purpose of this lab is to understand forces and how they work. The rules for this challenge are below: • Each team consists of up to four team members • All...

Homework Statement A student tries to raise a chain consisting of three identical links. Each link has a mass of 380g. The three-piece chain is connected to a string and then suspended vertically, with the student holding the upper end of the string and pulling upward. Because of the student's...

Hey guys, I am new here and hope to be able to contribute with some of the discussions in Relativity. I will start my participation with a conceptual question that arised during my studies and has been boggling me since then. I have been studying Relativity using the book "A First Course in...

Homework Statement find the radius R3=((T2GM/(4∏2))1/3 The Attempt at a Solution simple enough, my only question is when I plug in T (units: sec) G (units: m/s^2) and M (units: kg) there is nothing to cancel out the kg so my R is not in units of meters...the equation is correct because...

Homework Statement An equation of state that has been used to model the behaviour of a fixed amount of a real gas is (p + a/v2) (V - b) = ZT In the equation, Z, a and b are constants, and P represents pressure, V represents volume, and T represents temperature. The constant Z depends on the...

Hey guys ! I am confused when textbooks say that P (pressure), V (volume), T (temperature), n (moles) or any combinations of these be CONSTANTS. Especially when it comes down to the three gas laws. I don't understand what some variable being a constant means :( and hence the immense confusion...

Homework Statement Find the effective resistance between the circled nodes in the following network (use a computer to solve the system of equations you get). Note that bump in the crossing wires meaning they're not connected.Homework Equations Sum of currents at a node is 0. Sum of voltages...

Hi there can anyone please explain to me these questions I am really confused about them. Q: A 15 kg wagon is pulled to the right a force of 45 Newtons. the wagon accelarates at 2 m/s2. what is the net (unbalanced) force accelerating the wagon? (f of g is 10) the book says the answer is...

My question has to do with something Leonard Susskind, a professor of theoretical physics at Stanford University and director of the Stanford Institute for Theoretical Physics, said in one of his lectures. Basically that he didn't know why Newton wrote three laws of motion, when they could all...

I'm a mold inspector looking for an answer to gases from mold growing in wall cavities of a house. The issue is whether gases penetrate into room air (which I can test for) and what the best approach (short of gutting the house) is to reduce exposure to mold gases in the house. The two...

Homework Statement Calculate the resistance of this combination of resistorsHomework Equations V=IRThe Attempt at a Solution By using KVL : V= 3I_{5} = I_{2} = 2I_{4} I = I_{1} + I_{2} I_{3} = I_{2} + I_{4} I_{1} = I_{5} + I_{4} I = I_{3} + I_{5}Now the final result could be obtained by the...

"Newton's laws are the foundation stone of modern day mechanical engineering." Do you agree? Why?

Homework Statement two questions below in my classical mechanics course (our first homework assignment) and I'm not sure what the questions are actually asking...do they want the equations? descriptions of the laws? names of the laws? I'm confused because question one and two seem very...

Hi all ... thanks in advance to anyone who helps me out ...it should be simple , i need some formulas .. for example 1. Find the mass of an cargo that can be moved by using a hydraulic piston pump if D=1,7m and d=400mm=0,4m and force is 300hN. If force goes up by 10% find the pressure and...

Hi, Ive trying to work through Kirchhoffs voltage and current laws. Ive so far calculated: Current in Loop one (I1): 3 Amps going anticlockwise Current in Loop Two (I2): 4 amps going anticlockwise Current in Loop Three (I3): 8 amps going anticlockwise R1: 5 amps going up = (Current...

How to calculate the time needed for a perfectly spherical balloon with radius R to become R/2 due to diffusion of the gas inside, which is assumed to be nitrogen, by using Fick's Law of diffusion. Let the Young's Modulus be E. Fick's First law: J=-D∂C/∂x the change in pressure...

two simple questions about equivalent resistance and kirchhoff laws! pleaseeeee! :D EQUIVALENT RESISTANCE: Hi everybody . greetings from Peru.I know it's a dumb question but help please .please read below Homework Statement For the network shown in the figure, show that the resistance Rab =...

Hey guys. I have long since realized that my interest and fascination for physics in general outweighs my mathematical skills by far. And since logic and common sense only gets you so far, I reach out to you with a sincere hope that you might help me see things more clearly. I'll start off...

I really need it now! Someone helps me

Homework Statement The temperature of an ideal gas (M=28kg/mole) has increased 14K by adding 29J of heat at a constant pressure. To cool the gas back to the initaial temperature 20.7J of heat is extracted from the gas at a constant volume. Find the mass of the gas. Homework Equations...

Homework Statement http://session.masteringphysics.com/problemAsset/1003291/40/15092_a.jpg In previous parts of this problem, I solved that the current travels counterclockwise, and that I_A = \frac{2{\cal{E}}}{R_{2}+2R_{1}} . Homework Equations V= IR R[series,total] = (1/R1 + 1/R2 + 1/R3...

Introduction This is not a homework or coursework question (if it were it would be of the project type), and I am looking for hints not spoilers. Hi, I recently passed by kepler's laws again in a science class (this time Earth science), and am concurrently taking calculus in my math class...

I haven't studied quantum mechanics yet but I know that at the lowest level everything is random. But if everything is random how can we have definite laws like Newtons laws, electromagnetic laws. I mean if everything is random at the lower level these laws will also vary right, they can't be...

Homework Statement The invariance of physical laws to a coordinate change suggests a symmetry group structure. Can the operations of cordinate transformation be written as group operations? What is the group? Homework Equations The Attempt at a Solution At the moment I do not...

Two toboggans are connected by a rope. The first toboggan has a mas of 60 kg and the second has a mass of 40 kg. The two toboggans are pulled by a rope connected to the first toboggan. If the force exerted on the rope is 250N [E], and friction between the toboggans and the ice and be ignored...

Hello, I am hoping for some input concerning shall we say the philosophy of mechanics, particularly with relation to the concept of force. Most textbooks treat force as being something of a primary concept. A fundamental aspect of nature much like energy and mass and therefore something...

Homework Statement In the circuit shown in Figure Q8 below, if Vs = 10V, use Kirchoff’s Laws to determine the currents i1, i2, i3 and the source current is. Calculate the power dissipated by the resistors in this circuit. Confirm that the power dissipated by the resistors is the same as the...

Homework Statement I am trying to determine the birghtness of the lettered bulbs relative to the brightness of the bulb in the first and simplest circuit by giving a mathematical explanation using Kirchoff's laws. All cells and bulbs are identical. Homework Equations Kirchoff's current...

Homework Statement how do i solve it ? if someone can help I will appreciate it. Two masses m1 = m2 = 3 Kg and 5 Kg lie on two inclined planes with negligible friction connected via a cord that is inextensible and massless. The planes have angles of 30 degrees for m1 and 40 degrees for...

Homework Statement Fig. 4.3 A 5.0-kg block and a 4.0-kg block are connected by a 0.6-kg rod. The links between the blocks and the rod are denoted by A and B. A force F is applied to the upper block.In Fig. 4.3, the force in link B is 40 N. The acceleration of the blocks and rod assembly...

Homework Statement A 1.20 g spider hangs on its thread from the branch of a tree. A horizontal win blows the spider and the tread to an angle of 35 deg from the vertical. Find the force of win on the sider and the tension in the tread. Diagram...

I wanted to ask from my intuition of Newton's First law that body in motion remains in motion. Assume we kick a ball on earth, we does our force of kicking stops. I mean ultimately it comes to a stop due to resistance and gravity. Now, assume it is in space with no gravity or air. When we kick...

I'm trying to understand if a really heavy object on earth, say a mountain, would move if I push it with my bare hands. This sounds absurd but according to Newton's Laws, if I push against the mountain it will exert an equal and opposite force. I understand there are other forces like gravity...

When people talk about harmonic oscillators it seems to me that they always assume either that the relationship of force and displacement is linear, or that it behaves in some sinusoidal fashion. Do you always have to assume one to be able to arrive at the other? Or is there something I'm...

Why does "our" universe/dimension follow the laws that it does? Why does nature follow the principals that it does? say there is no God, why are the parameters and laws/constraints of the universe the way they are. Why do they exist? they didn't just come about, why are they the way they are...

Homework Statement Homework Equations Newtons' Laws Kinematics Equations The Attempt at a Solution I don't know what I'm doing wrong, but I'm not getting the correct answer of 17cm ... :cry: