machine

  1. P

    The weighing machine

    Having problems with this problem on Isaac physics I have solved parts A to D but part E i am struggling with. See the link below https://isaacphysics.org/questions/weigh_machine Any guidance would be great
  2. P

    machine vs. computer

    What the difference between computer to machine?
  3. S

    Machine??

    Hey :-) What machine/equipment can you change the ,electrical charges output, the voltages output and frequencies output? all at once Thanks
  4. S

    Looking for a machine

    Hey :-) What machine/equipment can you change the ,electrical charges output, the voltages output and frequencies output? all at once Thanks
  5. K

    D'Alembert and Atwood's machine

    D'Alembert's principle appears to boil down to this equation: \sum_i (\mathbf{F}_i-m_i \mathbf{a}_i ) \: \delta \mathbf{r}_i = 0 where F is the applied force and a is the "inertial" (whatever that means) acceleration. Now please check my analysis. (It's no good learning to mimic the...
  6. T

    Acceleration of a Block on an Atwood's Machine?

    Hello. I'm stuck on a problem that has me determining the acceleration of a block on an Atwood's Machine. (The whole question and figure are shown in the attached screenshot). Information Tensions T1 and T2 M1 = 2.0kg, M2 = 4.0 kg, and Mp (pulley) = 2.0 kg R = 6.0 cm Frictional Torque =...
  7. N

    How close in todays technology of building a human memory erasing machine. Could it b

    How close in todays technology of building a human memory erasing machine. Could it be done in these three steps.? To make human tissue translucent, maybe you could make invisible EM waves pass through a solid object, while combining the EM waves with other types of EM waves to make electrons...
  8. W

    Perpetual machine

    I was looking at a map of Hudson Bay's gravity anomaly when it occurred to me that it should be fairly simple, though not inexpensive or profitable, to build a free energy generator using this phenomenon. If you built a simple, large wheel where on one side of the wheel would be the greater...
  9. J

    Is This a Working Time Machine?

    This image was taken from this video https://www.youtube.com/watch?v=M1pCbM7s7Rs The answer will probably be no, but i am interested to know WHY this would/would not work. He is using a nonlinear crystal to create two entangled photons, one of which he is sending through the Einstein-Bose...
  10. M

    atwood's machine

    How to find out the upward force acting on the axle of a pulley in an atwood's machine with the masses in an acceleration?
  11. I

    Power for a turning machine

    I have been asked to compare the power required to turn a 80mm dia. bar at 100rpm to that of an 80mm dia. at 200 rpm. I'm not too sure how to go about this... I have made the presumption that I'm using steel which can be machined at 15cm^3/min per kilowatt. I know that 100rpm will produce...
  12. C

    Machine efficiency

    Hey stuck on a problem and need some help, A machine lifts a mass of weight (490.5N) through a height of 12m with 7.81KJ of energy exerted what is the efficiency of the machine. Thanks Che
  13. C

    Semi-Atwood Machine

    I've uploaded a diagram of the problem. In the setup shown, m1 = 0.30kg, m2 = 0.45kg and theta = 11 degrees. Also, between the first block and the incline, coefficient of friction = 0.40. Assume the system moves so that the first block slides up the incline. (a) What is the acceleration of the...
  14. C

    Modified Atwood Machine

    I'm really having trouble with these problems. I'm given a modified (semi) Atwood machine with a mass being "dragged" up an incline of 30 degrees. The mass of the block on the incline is 0.800kg and the mass of the other block is 0.500kg. I draw the FBD and I come up with a tension force...
  15. M

    Time machine

    If someone makes time machine and travels in future or past then how will he return in present. Because his turn would involve acceleration and then Special relativity no longer apllies as it requires non accelerating frames of reference.
  16. S

    Double Atwood Machine

    Frictionless, massless pulleys and cords. Determine the acceleration of masses ma, mb, and mc. In terms of ma, mb, mc, and appropriate constants. I could not figure out how to eliminate the other accelerations from the solution. I kept getting: m_a(a_a+g)+m_b(a_b+g)+m_c(a_c+g)=0...