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Relative Motion Analysis using Rotating Axes01:25

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Curvilinear Motion: Rectangular Components01:23

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Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
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Related Experiment Video

Updated: May 6, 2026

Real-time Video Projection in an MRI for Characterization of Neural Correlates Associated with Mirror Therapy for Phantom Limb Pain
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Quantum-limited mirror-motion estimation.

Kohjiro Iwasawa1, Kenzo Makino, Hidehiro Yonezawa

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Physical Review Letters
|November 5, 2013
PubMed
Summary
This summary is machine-generated.

Researchers measured optomechanical motion and force with quantum precision. Squeezed light states improved accuracy beyond classical limits, approaching quantum bounds for enhanced sensing.

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Area of Science:

  • Quantum optics
  • Optomechanics
  • Precision measurement

Background:

  • Quantum Cramér-Rao bounds define fundamental precision limits for parameter estimation.
  • Optomechanical systems couple light and mechanical motion, enabling sensitive measurements.

Purpose of the Study:

  • To experimentally demonstrate optomechanical motion and force measurements near quantum precision limits.
  • To compare measurement performance using coherent and phase-squeezed optical states.

Main Methods:

  • Utilizing optical phase tracking and quantum smoothing techniques.
  • Employing coherent and phase-squeezed optical states to probe a mirror's motion.
  • Measuring motion of a mirror subjected to an external stochastic force.

Main Results:

  • Achieved position, momentum, and force estimation accuracies close to quantum Cramér-Rao bounds using coherent states.
  • Demonstrated clear quantum enhancements beyond coherent-state bounds with squeezed states.
  • Experimental results validate theoretical predictions for quantum-enhanced sensing.

Conclusions:

  • Optomechanical systems can achieve near-quantum-limited precision measurements.
  • Phase-squeezed light offers a pathway to surpass classical sensing limits in optomechanics.
  • This work advances the development of quantum technologies for precision sensing.