Second law Definition and 479 Threads

Graphs Of Acceleration And Force Hi! We did this lab...on Newton's Second Law. we are trying to prove the formula F=ma... Now i drew this graph of acceleration vs time and force vs time...they look similar..how can i interpretate them? someone help! MY lab is due tomorrow!

Homework Statement suspended a heavy weight from a light string and attach a similar string below it. if you pull on the lower string with a steadily increasing force, the upper string will break; if you pull the lower string with a jerk, the lower string will break. please explain to me...

Hi all, Having some trouble understanding/finding the derivation of Fick's second law of diffusion in cylindrical co-ordinates. I have attached the solution which describes the refilling of a laser cleaned spot via surface diffusion. So basically i would like to know the intermediate...

Hey all, I am new to Physics. Recently changed majors from technical writing to physics for the amount of interest I have in the subject. I have been doing ok but I missed a couple of questions on my last homework and I feel that I should have had somebody check my general solved statements...

can anyone proove "kelvin plank" statement of second law of thermodynamics or atleast show that it is always followed in any cyclic process...

Homework Statement Open Question 3.bmp Homework Equations The Attempt at a Solution Open Answer 3.bmp Any help with this would be greatly appreciated

in the Newtons second law of motion we study "F=ma" letters having their usual meanings. so if any object say"A" comes in the way of a huge object "B", moving with a constant velocity; a=0, doesn't the object "a" feel any force upon him?

I am educated enough to know the Big Bang was not an explosion, but rather an expansion. However, does this not violate the Second Law of Thermodynamics? How can stars, galaxies, and planets develop and lose enthropy if the Second Law says that it should gain enthropy. Also, the universe was...

I already learned about Newton's Third Law but nowhere in my reference book can I find Newton's First and Second Law. Surely there must be the First and Second Law before the Third Law is taught. What is Newton's First and Second Law about ?

An applied force accelerates mass A at a rate of 6.0m/s^2. The same force applied to mass B accelerates the mass at a rate of 8.0m/s^2. If the same force were used to accelerate both masses together, what would be the resulting acceleration be?

Homework Statement For sport, a 12 kg armadillo runs onto a large pond of level, frictionless ice with an initial velocity of 5.0 m/s along the positive direction of an x-axis. Take its initial position on the ice as being the origin. It slips over the ice while being pushed by a wind with a...

You are pulling your little sister on her sled acroos an icy(frictionless) surface. When you exert a constant horizontal force of 110 N, the sled has an acceleration of 2.5 m/s^2. If the sled has a mass of 7 kg, what is the mass of your little sister? Heres how I attempted it: F=110N A=2.5...

A machine has an 760g steel shuttle that is pulled along a square steel rail by an elastic cord . The shuttle is released when the elastic cord has 16.0N tension at a 45º angle. What is the initial acceleration of the shuttle? Here is the only photo associated with this...

Homework Statement While two forces act on it, a particle is to move at the constant velocity v = (3 m/s)i - (4 m/s)j. One of the forces is F1 = (2N)i + (-6N)j. What is the other force? Homework Equations Fnet = ma The Attempt at a Solution Well, I'm really just wanting a...

Homework Statement After falling from rest at a height of 29.8 m, a 0.596 kg ball rebounds upward, reaching a height of 23.9 m. If the contact between ball and ground lasted 1.68 ms, what average force was exerted on the ball? Homework Equations The Attempt at a Solution so I...

Homework Statement A 3.00kg object is moving in a plane, with its x and y coordinates given by x=5(t^2)-1 and y = 3(t^3) + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t=2.00s Homework Equations F = ma The Attempt...

Newtons second law problem, show all work including units Question: How much horizontal net force is required to accelerate a 1000 kg car at 2 m/s^2?I am not sure which formula to use in this equation

kirchhoff's second law...having exams soon, please help Homework Statement i got this circuit, in the attachment below. i was asked to find: (1) I1 and I2 (2) the voltmeter reading (the voltmeter has one terminal connected at the point between the 2 ohm resistor and the 12V battery, say...

I need to integrate \frac{mdv}{F(v)} = dt to show that t = m \int^{v}_ {vo} \frac{dv '}{F(v ')} Now, I now that velocity is the derivative of position, and the mass is constant, but how does one integrate F(v)? [Integrating is a weak spot for me] Thanks in advance!

Homework Statement F=ma can be written as F=ma(along x, y or z-direction, ) when applying this equation along say horizontal x direction, the direction of acceleration needs to be taken as it is a vector. i mean say 2 forces of 5 N and 3 N are applied on a 2 kg body that moves towards...

Thermal noise known as “Johnson noise” or “Nyquist noise” is well known and characterized. This noise is a result of thermal agitation of charge carriers inside a conductor. Its power spectral density is given by: v^2=4kTRwhere kB is Boltzmann's constant in joules per kelvin, T is the...

Can somebody please give me hints as to how to approach this problem? Three blocks are in contact with each other on a frictionless horizontal surface. [order: 2.8kg, 6kg, 7.7kg] A 667 N horizontal force is applied to the block with mass of 2.8kg. What is the net force on the block with mass...

Homework Statement The steel ball is suspended from the accelerating frame by the two cords A and B. The angles (they are on the inside) are both 60 degrees. Determine the acceleration of the frame which will cause the tension in A to be twice that in B. The acceleration is going to the...

I'm having a hard time understanding this. If a car that has a constant acceleration hits me let's say at 10km/h then at 100km/h will it exert the same amount of force on me? F= ma mass and acceleration are constant. But this doesn't seem right, does it? Do you guys know any good website or...

My textbook is Essential University Physics by Richard Wolfson. I'm attending Illinois Central College, and my course is Engineering Physics 1: Mechanics. It's calculus based. Homework Statement From the Text: "A florist asks you to make a window display with two hanging pots as shown in...

Hi guys! Can anyone please help me with these questions about the 1st and 2nd Law of Thermodynamics? First Law of Thermodynamics 1. An inventor has designed an electric car in the following manner. Batteries in the car power an electric motor that drives the vehicle. When the car coasts...

1. A 2.0 kg otter starts from rest at the top of a muddy incline 85 cm long and slides down to the bottom in 5.0 s. What net force acts on the otter along the incline. 2. Homework Equations - F=ma, maybe some more too. 3. The Attempt at a Solution I attempted this question for...

i need help with this problem please help (If you use a horizontal force of 30.0 N to slide a 12.0kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?) PLZ HELP AHHHHH ITS DUE TMRW SO PLZ HELP

hmm...i was wondering is there any conditions for the use of Newton's second law?

Here is the problem I am working on: http://img45.imageshack.us/img45/5566/image0002bv6.jpg Here is my work: http://img177.imageshack.us/img177/7127/image0001zy6.jpg I cannot solve (2) for v since there are no real roots. When I set up the net forces in the x-direction in (1), should I...

only two forces act on an object (mass = 3.00 kg). 40.0N east and 60.0N north of east at 45 degrees. Find the magnitude and the direction (relative to the x axis) of the acceleration of the object. I don't really know where to begin.

A child slides down a slide with a 28 degrees incline and at the bottom her speed is preisely half what it would have been if the slide had been firctionless. Caluclate the coefficient of kinetic friction bewteen the slide and the child.

Hello to everyone! This is my first time that I use forums and I hope you will help me! Here is my question/problem: Is it possible using the second thermodynamic law to proove that: If the total work done by heat engine operated between two temperatures is zero, than it follows that...

hello:) i have a question: if i changed the mass of the ball on the pendulum, i assume that Changing the mass of the ball would not change the period of the pendulum because gravity pulls objects towards Earth at the same speed regardless of their mass. however Newton's second law says that...

can the second law of thermodynamics be defied? in other words, can mother nature be fooled somehow? have we (homo sapiens) accomplished such a thing with religion? for example, the seventh day of the week is nothing but a positive entropy change from sunset to sunset. can we somehow use that...

I have a couple homework problems that are causing me some trouble... 1. The weight of 600g of salami is: a) 0.061 N b) 5.9 N c) 61 N d) 5.9 kN I found the answer to be a) 0.061N because F=mg so m=F/g which is 0.6kg/9.8m/sec.squared. The answer is actually b) 5.9 N but I can not...

I hadn't seen this posted elsewhere already, and it certainly hits on a lot of topics which have been recently discussed: Irreversibility in Collapse-Free Quantum Dynamics and the Second Law of Thermodynamics by our esteemed member M. B. Weissman: Abstract: Proposals to solve the problems...

I know that violating physics laws is impossible; this is just a question, so just answer it and don't say that can't happen. Anyways, if there is a light object and a heavy object, and forces of the same magnitude are exerted on the the objects, and despite the heavier mass, the heavier object...

Hi, I have a question on Newton's second law. I have a box in which an egg rests inside. Egg is surrounded by some sort of padding. A force is applied to the box. (Force has an x and -y component. Are my conclutions right? 1) Force act on the box, not on the egg. Applying Newton's...

I've thinked an experiment. We have two containers that contain two liquids. One container contains a liquid that have small molecules and with high specific weight. The second container contains a liquid that have molecules greater and low specific weight. Now we connect the two container...

Newton's second law! According to Newton's second law if the resultant force acting on a body is non zero the body moves with an acceleration proportional to the mass of the body, right?Then, 1. Can anyone explain this in an intuitive sense? 2. In solving problems we say that the resultant...

I'm reading through an example involving Newton's second law. The situation is that there are n particles surrounded by a system boundary. The picture consists of a bunch of circles (particles) enclosed by a closed loop. The forces acting on one of the particles of mass m_i consist of an...

Question answered! Thanks for the input!

I was wondering if anyone had some input on how, via calculus, to show how the law of conservation of mechanical energy for an object in free fall (ideal) is a direct consequence of the of Newtons second law.

Could anybody of you verify my answers here please... it's really important for me to know if I'm doing it right! A mass m2= 10 kg slides on a frictionless table. The coefficients of static and kinetic friction between m2 and m1 = 5 kg are us= 0.6 and uk= 0.4...

Can anyone please help me with these two problems?? I have been trying to figure them out for a while, but cant... 1. A net force of 125 N acts on an object. Find the single force that will produce equlibrium? Is the answer a force of -125N acting back on the object?? Seems...

I have absolutely no idea how to do this problem and I need help with steps, formulas/equations, etc. So, here it goes! David Purley, a racing driver, survived deceleration from 173 km/h to 0 km/h over a distance of 0.660 m when his car crashed. Assume that Purley's mass is 70 kg. What is the...

Only two horizontal forces act on a 3.0 kg body. One force is 9.0N, acting due east, and the othr is 8N, acting 62 degrees north of west. What is the magnitude of the body's acceleration? Fnet= ma ...so I took that to mean F1x + F2x = ma F1x = 9 cos 0 = 9 f2x = 8 cos 62 = 3.76 a = (9 +...

Is someone able to proove the invariance under Galilean transformations of F=dp/dt within a system of variable mass? In particular is the momentum invariant? i.e. p=p', as Goldstein states? Please answer me! :wink:

Three astronauts, propelled by jetpacks, push a 120kg asteroid toward a processing dock, exerting the forces F1 = 32N at 30 degrees above the horizontal F2 = 55N on the horizontal F3 = 41N below 60 degrees below the horizontal what is the asteroids acceleration in unit vector notation...