What is 2nd law: Definition and 298 Discussions

The 2nd Law is the sixth studio album by English rock band Muse. It was released on 1 October 2012 in the United Kingdom and elsewhere on 28 September, 2 and 3 October under Warner Bros. Records and the band's own Helium-3 imprint. The title of the album refers to the second law of thermodynamics and the album's cover art features a map of the human brain's pathways, which was taken from the Human Connectome Project. Recording of the album took place in four different studios, began in October 2011, and ended in August 2012. Mainly self-produced by the band, with the exception of the song "Follow Me", which was co-produced by English electronic music trio Nero, The 2nd Law features multiple styles of music and was influenced by acts such as Queen, David Bowie, and Skrillex.
Upon release, the album received generally favourable reviews from music critics, holding a 70/100 score on review aggregator site Metacritic, and had a very positive commercial performance. It was a top ten-charting album in 31 countries and a number one album in 13 countries. The album has been certified platinum by the BPI in the United Kingdom, the FIMI in Italy, the IFPI in Switzerland, and Music Canada in Canada. It has also been certified triple-platinum by the SNEP in France. At the 55th Annual Grammy Awards, the album was nominated for Best Rock Album and the album's second track "Madness" was nominated for Best Rock Song. The album's third track "Panic Station" was also nominated for Best Rock Song at the 56th Annual Grammy Awards the following year.
A total of five official singles were released from the album. "Survival", released on 27 June, and "Madness", released on 20 August, preceded the album's release. "Survival" was notable for being chosen as the official song for the 2012 Summer Olympics, while "Madness" was notable for its positive commercial performance, as well as for topping the Billboard Alternative Songs chart for a record 19 weeks, beating out the previous record set by "The Pretender" by Foo Fighters. Three singles were released after the release of the album: "Follow Me", released on 7 December, "Supremacy", released on 20 February 2013, and "Panic Station", released on 31 May. "Big Freeze" was also released as a radio single in France and "Animals" received a music video release, both in April 2013.

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  1. T

    Does life violate the 2nd law of thermodynamics?

    If you look at Earth 3000 years ago versus the Earth today there is now far more structure, ie cities, roads etc. It is less random, it has less entropy, and that is as a result of life. Especially intelligent life. Considering the solar system as a whole, does the decrease in entropy...
  2. J

    Newtons 2nd Law & Kinetics pt. 2

    Homework Statement A 500kg crate is pushed with a 2000N force. The force of the sliding friction acting on the crate is 1900N. How fast will the crate be moving after 10 seconds? How far will it have moved in this time? Determine the net force Homework Equations a = \SigmaF/m...
  3. J

    Applyings Newton 2nd Law and Kinematics

    Homework Statement A 10,000 kg rocket is acted upon by a upward thrust of 118,000N How fast will the rocket be moving after 20 seconds? How far will it have moved in this time? Also, how do i determine the net force Homework Equations a = \SigmaF/m d=1/2at2+vit The Attempt at a Solution...
  4. W

    Coming up with a Newton's 2nd law tension problem

    Homework Statement So I am coming up with a word problem dealing with N2L. It goes like this. I have an object on top of a cliff i want to get, so i attach a pulley to the edge of the cliff. Now i tie my self to the object and string it with the pulley. To get the object down I will rappel off...
  5. A

    Thermodynamics homework about 1st and 2nd Law

    Homework Statement A rectangular steel tank having an internal volume of 1 m3 contains air at 2.5MPa and 20°C. A relief valve is opened slightly allowing air to escape to the atmosphere. The valve is closed when the pressure in the tank reaches 350 kPa. a) Calculate the amount of heat that...
  6. V

    Newton's 2nd Law - Rotation, Torque, Disk

    Homework Statement Homework Equations Newton's 2nd Law F = ma Torque Equation τ = Iα The Attempt at a Solution Well I know I have to write separate equations for the masses and tensions so I got this: T1 - m1g = m1a T2 - m2g = -m2a -----> (negative because acceleration...
  7. P

    Solve Newtons 2nd Law for Friction Coefficient: 4kg School Bag, 20N Force

    Homework Statement While walking down the hallway, a student drags his 4kg school bag. The force on the bag is 20N [60 degrees above the horizontal]. If the bag moves at a constant speed, what is the coefficient of friction? Homework Equations Fn = Fg-Fasintheta Ff = u(Fn). The...
  8. V

    Newton's 2nd Law conceptual problem

    A 15,000 kg rocket blasts off from Earth with a uniform upward acceleration of 2.0 m/s2 and feels no air resistance. The thrust force its engines must provide during this acceleration is 30,000 N upward. Apparently this is FALSE! I don't understand why F=MA 30000N=15000kg*2m/s^2...
  9. Z

    Entropy of Irreversible Process for 2nd Law Proof

    My textbook tries to prove that for Entropy of Irreversible Process > 0 by using the example of irrev expasion into a vacuum which doesn't make sense to me. If work is = 0 then no heat is exchanged between the sys and surrounding so qsurr = 0 s(uni) = s(sys) + 0 since S(sys)=qirr/t and no...
  10. C

    Newton's 2nd Law Question (2-Dimensions)

    Homework Statement A proud homeowner is out mowing their lawn. If the force of friction on the mower is 50.0 N and it is accelerating forward at 0.15 m/s2, what is the magnitude of the applied force if the owner is pushing on the handle of the mower at an angle of 70 below the horizontal...
  11. G

    Newton's 2nd Law: Doubling Force, Double Speed?

    Homework Statement An arrow, starting from rest, leaves the bow with a speed of 25 m/s. If the average force exerted on the arrow would be doubled, all else remains the same, with what speed would the arrow leave the bow? Homework Equations force = mass x acceleration The Attempt at a...
  12. J

    Solving Newton's 2nd Law: M1 and M2

    Homework Statement http://gyazo.com/f075da031d0e9d66f269e27628619082.png http://gyazo.com/525919e03d92ae9efad90cc06995ec1b.png Homework Equations F = ma F = 0 The Attempt at a Solution T = Fg for M1 M2 = T - ma = T-M2a I don't know what to do after this.
  13. B

    Newton's 2nd Law Force Problem

    Homework Statement There are two forces on the 1.97 kg box in the overhead view of Fig. 5-31 but only one is shown. For F1 = 27.6 N, a = 11.1 m/s2, and θ = 31.9°, find the second force (a) in unit-vector notation and as (b) a magnitude and (c) a direction. (State the direction as a negative...
  14. N

    Contradiction/breach 2nd law? Simply with carnot engine + negative temperature

    Hello, For a reversible heat engine between temperatures T_1 and T_2, the ratio of heat going in and out the engine is \frac{Q_1}{Q_2} = \frac{T_1}{T_2} (second law). Say T_1 = 200 K and T_2 = 273 K, then heat goes from 2 to 1 and as we can see, the ratio of heat that goes in the engine is...
  15. J

    Physics - Heat Pump - 2nd Law of Thermodynamics

    Homework Statement A heat pump has a coefficient of performance of 3.70 and operates with a power consumption of 6.91 103 W. (a) How much energy does it deliver into a home during 1 h of continuous operation? 9.2x10^7 J (b) How much energy does it extract from the outside air? ? JHomework...
  16. T

    Rectennas and 2nd law of thermodynamics

    Rectennas are diodes attached to antennas. With current technology they can convert EM waves with frequency up to \approx 1 THz to electricity. Imagine an isolated room at 300^{o} K containing a black object and a rectenna. By Planck law, the black object radiates about 450W/m^{2}, of which...
  17. I

    Decrease in entropy and 2nd Law of Thermodynamics

    General entrpy question from a book- (not a homework quesiton): When a room temp object is placed in a refrigerator, heat flows out of object and its entropy decreases. Indeed, the refrigerator may be said to be a device for sucking entopy out of warm objects. How can such a decrease in...
  18. M

    What happens to Newton's 2nd law if there is a changing mass?

    I understand that force is equal to the time derivative of momentum, or d(mv)/dt. Then what happens if the velocity is constant and only the mass is changing. Does this mean there will be a force. If so, in what direction since I am assuming it is still a vector. Also, what if the mass and...
  19. T

    Optics thought experiment and 2nd law of thermodynamics

    Imagine a closed isolated system consisting of 2 rooms separated by a window. The window is built with one layer of material that has refractive index 1.5 and one layer of material that has refractive index 2, for a wide range of wavelenghts (say 1 \mu m - 50 \mu m), and low absorption. The side...
  20. J

    Another 2nd law Violation Thread

    I recently attended this lecture by Physicist Daniel Sheehan, any opinions about the 2nd law soon violated in Laboratory Experiments? (and we are not talking about background fluctuations, etc). Experimental Challenges to the Second Law of Thermodynamics D.P. Sheehan, University of San...
  21. C

    Apparent 2nd law violation? (thermodynamics)

    This might be easy but apparently I haven't thought about long enough: Suppose a collection of particles with significant thermal energy are vibrating such that they emit electromagnetic radiation. Because of this, they cool down. Cooling means that their entropy decreases (classical...
  22. A

    Newton 2nd law of a fish in an elevator

    Homework Statement A person weighs a fish of mass m on a spring scale atached to the ceiling of an elevator. (a) Show that if the elevator accelerates either up or down, the spring scale gives a reading different from the weight of the fish. Homework Equations \SigmaFy=T-Fg=may...
  23. D

    Dynamics Newton's 2nd Law and Forces of Friction

    Homework Statement Block B rests upon a smoot surface. If the coefficients of static and kinetic friction between A and B are mu_s=0.4 and mu_k=0.3, respectively, determine the acceleration of each block if P=6lb. (picture attached below) Homework Equations Using Newton's Second Law...
  24. S

    The generalization of Newton's 2nd Law to apply to variable mass systems

    F = dp/dt = d(mv)/dt = m(dv/dt) + v(dm/dt) = a + v(dm/dt) i don't understand why d(mv)/dt = m(dv/dt) + v(dm/dt) can somone help ? TNX !:smile:
  25. Q

    Does a Black Body's Emission Rate Challenge the 2nd Law of Thermodynamics?

    1. Keeping the temperature constant, does the rate of emission from a black body depend solely on its surface area? 2. If it does, let's consider the following: we have two black bodies in our system, A and B lying close to each other. Both are at same temperature but the surface area of A is...
  26. W

    Development of 2nd Law Of Thermodynamics

    I am new here and have always loved the history of science as much as the science itself. I have been intrigued by the 2nd law of thermodynamics and entropy for a long time but have also had something about its evolution that bothered me. So I'll summarize its stated development from my...
  27. R

    Motion (Newton's 2nd law + weight question)

    [SOLVED] Motion (Newton's 2nd law + weight question) Homework Statement A waterskier of mass 70 kg is towed in a northerly direction by a speedboat with a mass of 350 kg. The frictional forces opposing the forward motion of the waterskier total 240 N. (a) If the waterskier has an...
  28. D

    CP-volation -> violation of 2nd law of thermodynamics?

    The amount of black body radiation is proportional to the albedo. Microscopically, this is a result of the fact that the probability of process ‘wall absorbs a photon’ is equal to the probability of the reverse process: ‘wall emits a photon’ Lets assume that it is not true, and probability of...
  29. I

    Newton's Second Law: Force, Mass, and the World's Fate

    Would the world fall apart and be destroyed if this law ceased to be constant? If not, how can we/do we speculate what would be different? Thanks!
  30. L

    Kinetic Friction and Newtons 2nd Law

    Homework Statement A car weighing 15000N experiences a drag force of 1200N. The car travels 30m/s on a level highway. The coefficient of kinetic friction is 0.2. If the car travels for 10s at this speed, calculate the power the engine produces. The car then goes up a 10 degree constant...
  31. P

    WHY does the 2nd law of Thermodynamics work?

    Dear All Can't get my head around this. Entropy of the universe (system+surroundings) always increases. But why? G = H - TS G = Energy available for work H = Enthalpy of reaction How can the energy available be greater than the enthalpy of the reaction? There must be some input from...
  32. F

    Newton 2nd law + frame of reference

    hello forum, i am struggling with the conceptual understanding of this problem: Given two blocks, one on top of the other. There is friction between the two blocks. The upper block is pulled with a force F. Thanks to friction, as long as F is smaller or equal to the static friction...
  33. B

    Block inside a spinning cone - Newton's 2nd Law problem

    Block inside a spinning cone -- Newton's 2nd Law problem Homework Statement See attempt at solution. I have attached everything there.Homework Equations F_net = m * a_n (net force) W = mg (weight) a_n = 4*pi^2 * R * f^2 ... formula for "normal" component of acceleration where R = radius, f =...
  34. H

    Rocket problem: Newton's 2nd Law

    Homework Statement In this problem we explore a slightly more realistic model of a rocket's acceleration still neglecting air resistance. Consider a rocket fired straight up from rest burning fuel at the constant rate of b kg/s. Let v=v(t) be the velocity of the rocket at time t and suppose...
  35. T

    2nd law of thermodynamics problems - help

    2nd law of thermodynamics problems - help! Homework Statement See the figure. Q's denote heat transfers while W denotes work supplied by heat engine to heat pump. (HE denotes heat engine and HP denotes heat pump.) A heat engine operates as shown in figure with an efficiency half of its...
  36. M

    How Do You Calculate Tension in a Pulley System?

    Homework Statement A 5.4 kg mass and a 6.2 kg mass are tied to a light string and hung over a frictionless pulley. What is the tension in the string? Homework Equations F=ma The Attempt at a Solution Not sure how to do this one. I know the tension on the string will be the same at both...
  37. P

    Modern Physics - Invariability of Newton's 2nd Law under a GT?

    Homework Statement Show that the form of Newton's Second Law is invariant under: (a). a Galilean Transformation (GT) in 1-Dimension. (b). a Galilean Transformation (GT) in 2-Dimensions. (c). a Galilean Transformation (GT) in 3-Dimensions. Homework Equations Newton's Second Law...
  38. P

    Kinematics and Newtons 2nd law

    Homework Statement A baseball of mass m is thrown vertically upward from a height r=0 with a speed of 20 meters/sec. The gravitational force on the baseball has a magnitude mg (m = mass, g=9.8 meters/sec2 is the acceleration due to gravity) and is directed downwards. Using Newton's second...
  39. H

    Newton's 2nd Law: Displacement & Trajectory of Motion

    If we make a diff. equation from Newtons's 2nd law, and solve it, we will get x(t), where x(t) is the displacement as a function of time. what do the shape of the graph x(t) means? Does it give the trajectory of the motion?
  40. C

    How Is the Elevator's Acceleration Calculated Using Newton's Second Law?

    Homework Statement A 1000 kg elevator is held up by two cables. If each able exerts a force of 6000N upwards upon the elevator, find the elevator's acceleration.Homework Equations Fg=mg FNET=maThe Attempt at a Solution I started with a force diagram to help me and then I think I'm supposed...
  41. M

    Equation 2nd law thermodynamics

    Can anyone give me the equation for the second law of thermodynamics... Please. Thanks
  42. L

    Newton's 2nd Law: Zero Acceleration Problem

    Hi all, here is a problem that has popped into my head every so often for the last year or so: A small, low-mass body is moving at a constant velocity of 1000m/s through a vaccuum, so it has no acceleration or deceleration i.e. a=0. Now let's say you are an astronaut and you are floating...
  43. P

    Mechanics Newton's 2nd law question

    Homework Statement A load of 200kg is lifted through 50m by a vertical cable. The load accelerates uniformly from rest for 20 seconds, travels at constant speed for 10 seconds then decelerates to rest in a further 10 seconds. Find the maximum speed attained and the tension in the cable at each...
  44. M

    Very brief explanation please? - Newt 2nd Law w/ Circular Motion

    Consider a conical pendulum with a weight on it and that makes some angle with the vertical. I am told to find the radial acceleration of the weight and someone showed me how it is solved but I don't understand why: I am told to set Tsin@ = m(ar) *ar = radial acceleration ar = (Tsin@)/m...
  45. M

    Work energy theorem vs Newton's 2nd law and kinematics

    So i have this general question. When the situation arises in which there are velocity and/or position depended forces acting on an object, would it be generally easier to use the work energy theorem or Newton's 2nd law & kinematics in predicting the motion? My guts tell me it will be work...
  46. M

    Newton's 2nd Law & Inclined Ramp

    Well these two problems were from my quiz, and if I don't find out how to solve them soon, I'm going to spend my whole weekend thinking about them. D8 I'll try to remember the problems as best I can. 1) An astronaut is in space, in the midpoint of two stars that have the same mass. If all...
  47. P

    I have a stupid professor and need clarification on Newtons 2nd law

    So is it true that if you have a constant velocity therefore you have no change in acceleration so A=0 and if you have no acceleration then you have no Fnet? And is that the case in ANY force problem? Thanks!
  48. O

    Mechanics ynamics (Newton's 2nd Law?)

    Mechanics:Dynamics (Newton's 2nd Law?) Homework Statement A sphere S with a mass of 5 kg is attached by a rigid rod to 1 kg block B which is free to slide with no friction in a horizontal slot. The system is released from rest. At the instant when it is released, find the tension in the...
  49. O

    Mechanics: Dynamics (Newton's 2nd law)

    Homework Statement A sphere S with a mass of 5 kg is attached by a rigid rod to 1 kg block B which is free to slide with no friction in a horizontal slot. The system is released from rest. At the instant when it is released, find the tension in the rod and the accelerations of both blocks...
  50. J

    Blackholes and 2nd Law of Thermodynamics

    Is it possible to deduce that a black hole must have something akin to Hawking radiation due to the 2nd Law of Thermodynamics? Let us consider for now a purely classical black hole. The event horizon is effectively a 'light diode' in that if light can pass through in a particular direction...
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