rcgldr's latest activity
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?."The rear wheel is prevented from precessing by friction of the tires on the ground, and so continues to lean as though it were not... -
rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?.The vertical axis torque exerted onto the gyro prevents any precession about the vertical axis. Two sources state that in this case, the...
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?.In the case of a gyro and gravity, the torque required to prevent precession about the vertical axis, so that there is only precession...
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?."Gyro just falls" is a quote from the Caltech video. Since there is no horizontal component of precession, the torque related to gravity...
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?.The new part is that the torque opposing precession coexists with zero net torque in the direction of change of angular momentum (the...
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?.New to this thread: The law of torque versus rate of change of angular momentum still applies: the torque required to prevent precession...
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rcgldr posted the thread Why have the number of questions declined over recent years? in Feedback and Announcements.It's not just at Phsyics Forums, as for example, this graph of the monthly question rate at stack overflow:
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?.From Caltech Feyman Lecture Hall - "You'll also notice that if I stop its precession, it simply falls"". A slightly out of balance gyro...
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rcgldr replied to the thread Undergrad How to quantify gyroscopic precession torque?.The formula for torque equals rate of change in angular momentum still applies, but when precession is prevented, the rate of change in...
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rcgldr replied to the thread Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?.As posted by jbriggs444, 18XL nominal (continuous) power is 2200 watts, peak power is 4000 watts. S18 Pro+ is nominal 2200 watts, peak...
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rcgldr replied to the thread Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?.The time was 2.04 seconds, but I don't know the resolution of the timer. On an EUC, the motor torque has to match the torque exerted by...
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rcgldr replied to the thread Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?.EUCs also have 3 axis accelerometers and gyros, and use a algorithm to determine the direction of gravity so they can maintain a...
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rcgldr replied to the thread Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?.My guess is the manufacturers deliberately over-report speed, often around 10%.
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rcgldr replied to the thread Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?.Riders do that so they can monitor speed while riding. The monitored speed can be GPS or as reported by the EUC. The app has a...
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rcgldr replied to the thread Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?.The app could be using the 3 axis accelerometer and gyro MPU | MEMS chip in a phone, which can determine the direction of gravity and...
