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Article Page 033 - Applying Newton's Laws to general questions.



  • Applying Newton's Laws to general questions.
    Can any explain the following concepts to me? I am clueless. And these are suppose to be general concepts....-Why does a child's wagon seem to fall backaward when you give the wagon a sharp push?.-If you walk along a log floating on a lake, why does the log move in the opposite direction?.-If a stone hangs by a fine thread from the ceiling, and a section of the same thread dangles from the bottom of the stone, and someone give a sharp pull on the danging thread, where is the thread likely to break: Below or above the stone? What if the person gives a slow and steady pull? .Thanks to anyone that can help me gain a better understanding,....
  • On quaternions
    Dear Friends,.I've read about quaternions, and they can be expresed in 4 terms or in angles like this:.Quaternions are a generalization of the complex numbers, but in 3D. My question is about angles. For example, with a complex number, we can write:.By generalization, is this ok? .By other hand, we can take the angles in complex numbers like:. --> Only one angle.how much angles has a quaternion? has angle with the real part?.my best reggards.....
  • Explaining these concepts (circular motion)
    Again, these concepts we discussed in class, but I still do not get them. Can anyone explain why they are true?.1) Will the acceleration of a car be the same when the car travels around a sharp curve at a constant 60 km/hr as when it travels around a gentle curve at the same speed? Explain..2) Which pulls harder gravitationally, the earth on the moon, or the moon on the Earth? Which accelerates more?.3) When will your apparent weight be greatest, as measured by a a scale in a moving elevator; when the elevators: (a) accel. downward (b) accel. upward (c) is in free fall (d) moves upward at a constant speed? In what case would you weight be the least? When would it bethe same as when you are on the ground?.My instinct for question three is that it is least on the way down, b/c your force, pushing on the scale is less. And it is greatest on the way up, since your force of push is stronger. And I would say in free fall it is the same as ground state?....
  • Ph.D, but which field?
    It's an important time for me, I need to decide what I want to do. I know I want to do a Ph.D (I have 1 year left of my Mphys degree in the UK) but I'm not sure about the fieldto specialise in. When I began university I was really set on doing a PhD in astrophysics.. But I've been put off by some of the astrophysics courses taught at my university (they were badly taught) and also the fact that astrophysicists seem to just sit at a computer and crunch numbers all day..I'm also interested in Quantum information/Quantum computing as I'm really into computers (building/programming) and Quantum physics is one of my favourite areas of study..I've looked at these two fields for sometime and my impression is that .Astrophysics - Not many jobs available, doesn't seem to be a great need for people in this field.Quantum computing - Has great potential but there aren't many universities who have groups that specialise in their development.. .I'm also looking at attending a US university for my studies - for a change of environment, personal reasons and also the fact that there are many good schools..My ultimate problem is deciding which field to focus on. Which field has a brighter future? Should I choose say 5 or 6 different fields at different universities and apply to them or should I just focus on one? :confused: .Any advice would be great!....
  • Hamlet - at the end
    At the end of the play, Fortinbras takes the throne. As he takes the throne, how does he seem to feel about and regard Hamlet?.Also, what does he say his finla rites will be, and why?....
  • SHM acceleration problem
    A 29.0 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring. The equilibrium position of the mass is defined to be at x=0. Somebody pushes the mass to the position x=.350 m, then lets go. The mass undergoes simple harmonic motion with a period of 3.50 s. What is the position of the mass 2.975 s after the mass is released?.I got this part fine, with an answer of .206 m.Consider the same mass and spring discussed in the previous problem. What is the magnitude of the maximum acceleration the mass undergoes during its motion?.I found the angular velocity by using . and got it to be 1.795. I then plugged it into the equation, .with x= .206 m, and t=2.975 s. I got a= .389 m/S^2, which isn't right. .can someone tell me what I'm doing wrong?....
  • Wavelength of Gamma Rays
    Gamma Rays of wavelength 0.710 Angstrom are scattered in a thin foil of Aluminium. The scattered radiation is observed at an angle of 60 degree from the incident direction. What wavelength would u expect to see?.Thanks in advance....
  • Finding Inflection Points (Applied Calc Question)
    The problem: Find the inflection points, if any, for the following: f(x) = e^x + x^-1.I know to find inflection points I have to:.1. Compute f''(x).2. Determine the points in the domain of f for which f''(x) = 0 or f''(x).does not exist.3. Determine the sign of f''(x) to the left and right of each point x = c.found in step 2. If there is a change in the sign of f''(x) as we move.across the point x = c, then (c, f(c)) is an inflection point of f..Well, this is what I came up with:.f'(x) = e^x -x^-2.f''(x)= e^x + 2x^-3.Then, I don't know what to do from there because e^x can never be zero, right? but I don't know. My teacher is saying there are inflection points....Your help is much appreciated!.Sam....
  • Trigonometri Question (HELP)
    Hi .I have this here Trigonometri function:.F(x) = Ax cos(x) + Bx sin(x) + C cos(x) + D sin(x) .where F'(x) = x cos(x) .I'm suppose to find A, B, C , D any hints or idears on how I do that?.Sincerely .Bob....
  • Thermal Physics > Air and Internal Energy
    This Q has me stumped, I'm still flicking through some web pages and my text book, but been unable to find a useful formula to work it out yet:. What is the internal energy U of one mole of air on a very hot summer day (35C)?.In answering the questions in this problem, assume that the molecules in air (mainly N2 and O2) have five degrees of freedom at this temperature (three translational and two rotational). :confused:....


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