Laws Definition and 1000 Threads

Homework Statement A truck (1200kg) is traveling south at 22m/s a) what is the net force required to bring the truck to a stop in 330m? b) what is the cause of this net force? (im assuming the answer is friction due to brakes) Mass= 1200kg (1.2*10^4) Velocity= 22m/s [south] What force is...

What would be some important properties of a universe where Force = Mass * Jerk and objects stay in constant acceleration until acted upon by a net force? (if we ignore the fact that objects would reach the speed of light, and just deal with classical mechanics)

Use Newton's to explain : When you take a step, you push down and back on the Earth and the Earth pushes up and forward on you. When you step on a skateboeard, the skateboard moves backward as you push down and back. Why does the skateboard move backward while the Earth does not even if the...

Homework Statement "Normally, jet engines push air out the back of the engine, resulting in forward thrust, but commercial aircraft often have thrust reversers that can change the direction of the ejected air, sending it forward." "When might thrust reversers be useful in practice? (Chose all...

In other words, where does this assumption become mathematically explicit? Is it because there is no parameter representing time in Newton's universal law of gravity? If so, what about other force laws like Coulomb's law for charges? I don't see any time embedded in that.

I wonder how the wave particle duality property of light persists with the laws of reflection? How exactly is a photon directed in the same angle (i.e. the angle of incidence) by a particle as reflection while abiding through the quantum theory and the Raman Effect? Such as we throw an elastic...

Homework Statement A cart of mass 1.5 kg is connected by a string over a pulley to a hanging mass of 300g. What would be the acceleration of the cart and mass if the force of gravity is approximately 1N for a 100g mass. Cart 1=1.5kg Cart 2=0.3 Kg Fg1=15N Fg2=3N Homework Equations F=ma The...

Homework Statement If two cars of equal mass are pushed apart by a spring mounted on cart #1 with a force of 14 N what will be the resulting acceleration of the carts. Mass of carts 1 and 2= 2.0Kg f=14N A? Homework Equations F=ma The Attempt at a Solution My theory is that the Newtons will...

Homework Statement The 20.0 kg box is being pushed with a 45.0N Force acting at an angle of 25.0*. The coefficient of kinetic friction on this surface is 0.150. Find the acceleration Homework Equations F=ma Fy=0 Fx=0 The Attempt at a Solution So I attempted this so far (sum)Fy=0 Py+Fn-Fg=0...

Hi, I know the basic laws of logs but just wanted some clarification on a few things; your help would be much appreciated :) (warning, these questions may seem stupid!) I know that \log{xy} = \log{x} + \log{y} but does 4\log{xy} = 4\log{x} + 4\log{y} OR = 4\log{x} + \log{y} ...

Homework Statement Adam and Ben pull hand over hand on opposite sides of a rope while standing on a frictionless pond. Adam's mass: 75.0kg Ben's mass: 50.0kg Adam's acceleration: 1.00 m/s2 to the east What is the magnitude and direction of Ben's acceleration?

Homework Statement A billiard ball of mass M is initially at rest on a horizontal frictionless table. Another ball of mass m < M and velocity ##\vec{v}## in the positive x-direction hits the first ball in a pefectly elastic collision. After the collision, the balls move with (unknown)...

Hi all, i agree with you that those guys that use Oxyhydrogen to increase MPGs in their vehicles must be violating some physics laws but the aim of this post is to understand why. Lets call: Eq : Chemical Enegry Ee : Electrical Energy Emec : Mechanical Energy: Ecal : Calorific Energy I imagine...

Homework Statement Use Netwon's laws to find an expression for the angle of incilination theta at which the refrigerator starts to slide. Express your answer in terms of possible g, Us, Uk and m. Homework Equations Fnet=ma Ff=UFn The Attempt at a Solution I attached my attempt...

There is a famous example that electron couldn't absorb the whole incoming photon without emitting another one. Instead of the normal way, I try to prove it simply by argument ( which might be wrong ). There are four constraints in the process, one from energy conservation, three from momentum...

1. Homework Statement An object consists of 3 connected masses as seen in the figure. None of the surfaces have friction except the surface on m1 which has the coefficients μs=0.4 y μk=0.3. What is the acceleration of each one of the masses? It looks like the following image but m1 is the...

For example, it could be said that the equation ∇*B= 0 is based on the observation that there are no magnetic monopoles. But for Faraday's law of induction, it is easy to derive it from other equations but it's hard to say on what empirical law it is based. Could it be said that it is itself...

Homework Statement A truck shown in the figure is driven with an acceleration a =3m/s2. Find the acceleration of the bodies A and B of masses 10 kg and 5 kg respectively, assuming pulleys are mass less and friction is absent everywhere. The Attempt at a Solution I have written three...

Homework Statement A body of mass 50 g is dropped from a height of 20 m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 200 N, so that it attains a vertical height of 45 m. The time for which the ball remains in contact with the bat is (g = 10...

Hello, I am working through Munkres Topology (not for a class). It asks the reader to formulate and proove DeMorgans Laws. I am new to proofs, so I was wondering if this is what the book is asking. Any help would be appreciated! assume two sets \, \,\begin{Bmatrix} A-(B\cup C)\...

Hi Forum, Simple question here, but one that has been bugging me. Please look at picture. So, rays from the baseball can go from the lower mirror to the eye. (1 image) Rays from the baseball go from the upper mirror to the eye. (1 image) Rays from the baseball go from the lower mirror to...

The science fair is after 1-2 months but I should submit a report not exceeding 300 words what I will do in the project tomorrow morning to my teacher. Now it's 10pm. Please give me ideas as soon as possible(Before 30min from now)

Hey guys, I have a couple more questions about this problem set I've been working on. I'm doubting some of my answers and I'd appreciate some help. Question: For a, I used the subtraction limit lawto get lim g(x) and lim f(x) and subtracted the answers accordingly. Then I substituted h=...

Definition/Summary Inertia is the phenomenon that a force is required to cause change of velocity. The amount of inertial mass of an object is measured by measuring how much force it takes to accelerate it. The symbol for inertial mass is m. Equations Extended explanation The...

Definition/Summary I. Each planet moves in an ellipse which has the Sun at one of its foci II. The radius vector of each planet passes over equal areas in equal intervals of time. III. The cubes of the mean distances of any two planets form the Sun are to each other as the squares of their...

What does the law say about writing malicious programs? What if I write one and distribute it but I never actually run it myself? What are the repercussions for writing a script that retrieves all the passwords from users on a message board (not this one), provided that I'm not taking any...

Dear Helpers, I'm sitting since ours in front of a task and trying to solve it. Attached you find a picture to the problem. Given: θ=28° μs=0.4 μk=0.3 k=30N/m m1=1kg m2=2kg x0=0 x1=1m --> Spring is stretched The question is: Does m2 move up or downwards? First thing I tried...

dear sir, i want to know the structure of the galaxies. the process that caused it happen.and finally some peculiar and intersting about galaxy.

This is my first thread, and I am excited to post it.:biggrin: My question is that, did any Scientists do any research about Center of Gravity and formulated any laws or gave explanation to it's fundamental behavior? If so, then have they considered the Center of Gravity of liquids and...

To=(time of moving object.) T=(Time of standing object.) ^=power of number. sqrt=square of number.(x^1/2)Law of einstein say: T= To / ( sqrt( 1 - u^2/c^2 ) ) Lorentz law say: T= (To + u*Xo/c^2) / ( sqrt( 1 - u^2/c^2 ) )Why there is difference?? Is for other things?? I thought is for the same...

Please help me to understand how this is possible. If time is required for an event to occur and every event is governed by one or more laws, then how can the big bang occur without time and without laws? Dr Lawrence Krauss mentions that when all that exists is nothing (I know this is...

Hello everyone, it's been a while since I've been introduced to Newton's laws for the first time. Yesterday I've been reading the Feynman lectures vol 1, where Feynman makes a remark about Newton's laws not really containing any physics. This got me thinking and I'm really confused right now...

The Kirchhoff's circuit laws are what there are of better for compute the current and voltage in anywhere of a circuit? Or exist another theory more simple, more practice and more general?

Homework Statement A 90 kg box is pushed by a horizontal force F at constant speed up a ramp inclined at 28°, as shown. Determine the magnitude of the applied force: a. when the ramp is frictionless. b. when the coefficient of kinetic friction is 0.18. Homework Equations F= ma, Ffr = μk *...

Hello, this thought I'm having might be difficult to explain, but i will do my best. Ever since i learned about conservation of energy, conservation of mass (or mass plus energy due to E=mc^2) and conservation of linear/angular momentum, i always found it weird that things in nature can...

Hey guys. So I have this question about this scenario.. If I have a glass of water on a table and I quickly pull the table cloth from under the glass, the glass stays put. I can't get my head around this. What causes this?

Why did Verlinde in his paper suggest that information is a central concept in the emergence of gravity? I mean why information and not something else?

Hi, Consider the various kinds of objects we have in our universe, from the smallest to the largest - sub-atomic particles, atoms, molecules, single-celled organism, multi-celled organisms, cities, countries, planets, stars, solar systems, galaxies, collection of galaxies, universe. Since...

Homework Statement 15. A solid sphere of mass 6.0 kg is mounted on a vertical axis and can rotate freely without friction. A massless cord is wrapped around the middle of the sphere and passes over a 1.0 kg pulley and is attached to block of mass 4.0 kg, as shown. What is the speed of the...

At least the first 2. The 3rd seems obvious to me. Don't get me wrong, I'm not denying CoE, I'm just questioning the reason why we have a law called Conservation of Energy, and an identical law called The First Law of Thermodynamics. As for the second law, I've seen it defined 2 ways: in...

Homework Statement PART A only Homework Equations The Attempt at a Solution The answer suppose to be mg sin theta- t cos alpha = 0 ( Newton's law). 15g sin36.9 = t cos 30 However, why don't we need a force of static friction?

Hello Everyone, I am currently re-reading Taylor's Classical Mechanics, in particular, section 4 in chapter 1. He is discussing Newton's Laws, and makes the statement: "A point mass, or particle, is a convenient fiction, an object with mass, but no size, that can move through space but has...

Given the circuit below: Why does KCL equate to \[ \frac{e - v_c}{R_1} = C\frac{dv_c}{dt} + f(v_c) + i_L \]

Homework Statement Homework Equations v = wr K_total = 1/2Mv^2 + 1/2Iw^2 L = Iw p = mv The Attempt at a Solution a. No friction or other outside forces are acting on the system, so linear momentum is conserved. The collision is elastic, so kinetic energy is conserved. There...

Hey everyone, Random question. Does anyone know any good childern's books about Newton's laws or catapults? I was thinking about getting a gift for my cousin who is turning 10 soon. He really likes catapults so I was thinking about getting him an educational book about catapults...

Homework Statement Mass of Block A = 1 kg Mass of Wedge B = 2 kg Inclination of Wedge is 37° and Cos 37° = 4/5 The wedge is given an acceleration of 5 ms-2 Find - 1. Acceleration of Block wrt Wedge 2. Normal Force Homework Equations Newton's Law for a System (hereby referred as...

There is a container of a fixed volume filled with gas. There is a second container with a piston filled with gas. The containers are filled with the same amount of gas, have the same pressure, have the same volume (the piston is placed so the gases of each container occupy the same volume)...

Homework Statement Hello. I need help with a lab today that involves rate laws. The goal of this lab is to show the concentration of the reactant ions in this equation 5(HSO3) + 2(IO3) -> I2 + 5(SO4) + H2O + 3H. We did several trials of varying amounts of the ions and calculated the...

Homework Statement The wind exerts a force of 420 N toward the south on the sails of Gerry’s sailboat, while the water exerts a force on the sailboat of 160 N west.The boat and Gerry have a combined mass of 320 kg, what are the magnitude and direction of the sailboat’s acceleration...

Homework Statement Consider the circuit shown in the diagram below, for R1 = 5 Ω, R2 = 8 Ω, R3 = 8 Ω, R4 = 8 Ω, and V0 = 8.0 V. Calculate the current through R4. Homework Equations Loop rule: The sum of all potential changes around a closed loop is zero Junction rule...