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Related Concept Videos

Vectors in 2D: Problem Solving01:29

Vectors in 2D: Problem Solving

A plane traveling due north at 180 km/h in still air was found to be 80 km off-course after 30 minutes, deviating approximately 5 degrees east of north. This deviation means the influence of a crosswind alters the plane’s intended trajectory. The actual ground path formed a diagonal, suggesting that the aircraft’s effective ground speed was reduced to 160 km/h and directed slightly to the east due to the wind.By analyzing the displacement from the intended path, the velocity contributed by the...
Average and Instantaneous Velocity Vectors01:12

Average and Instantaneous Velocity Vectors

To calculate other physical quantities in kinematics, the time variable must be introduced. The time variable not only allows us to state where an object is (its position) during its motion, but also how fast it’s moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position, a particular time is assigned. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity v. This...
Velocity and Position by Graphical Method01:34

Velocity and Position by Graphical Method

Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to calculate...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

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.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Velocity and Acceleration of a Wave00:51

Velocity and Acceleration of a Wave

A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it. 
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time. We can...
Coriolis Force01:23

Coriolis Force

An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression. Centripetal...

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Related Experiment Video

Updated: Jul 11, 2026

High-speed Particle Image Velocimetry Near Surfaces
11:59

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

Wind velocities on venus: vector determination by radio interferometry.

C C Counselman, S A Gourevitch, R W King

    Science (New York, N.Y.)
    |February 23, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Researchers tracked Pioneer Venus probes to measure wind speeds and directions. This study estimates velocity vector uncertainties, aiming for high accuracy in wind measurements below 65 km.

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    Last Updated: Jul 11, 2026

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    Area of Science:

    • Planetary Science
    • Atmospheric Dynamics
    • Aerospace Engineering

    Background:

    • Understanding Venus's atmospheric circulation is crucial for planetary science.
    • Previous methods for measuring Venusian winds had limitations in accuracy and spatial coverage.

    Purpose of the Study:

    • To determine precise wind directions and speeds on Venus.
    • To establish the accuracy of velocity vector measurements for descending probes.

    Main Methods:

    • Tracking Pioneer Venus probes in three dimensions using Doppler and long-baseline radio interferometry.
    • Utilizing preliminary tracking data and test observations of other spacecraft.
    • Estimating uncertainties in probe velocity vector determinations relative to Venus.

    Main Results:

    • Preliminary results indicate potential for high-accuracy wind measurements.
    • Estimated velocity errors are of the order of 0.3 meters per second or less for specific conditions.

    Conclusions:

    • The employed radio tracking methods are capable of providing accurate wind data on Venus.
    • Future analyses will yield detailed insights into Venus's atmospheric dynamics.