How fast can a wheel spin? - Physics Stack Exchange
2017年3月29日 · Bike can go no faster than speed of light. The rim of the wheel Lorentz – contracts as velocity of bike increases. The rest length of the rim of the wheel must remain constant. This means that the rim Lorentz contracts, and that the radial extension of the wheel contracts accordingly.
How can I determine the rpm of a wheel that's spinning really fast?
2017年8月26日 · That gives you two equations in two unknowns, and you can solve for f. So even if your strobe isn't nearly as fast as the wheel you can still get the wheel's rotation rate. (Or, if the next higher frequency gives a double-image of the wheel, then f1 was the actual wheel frequency in the first place.) $\endgroup$ –
How fast must a torus spin to have a felt gravity? [closed]
$\begingroup$ @Philipp - put the experiments on the hub (which rotates opposite to the "wheel" so it experiences zero acceleration) and the living quarters on the outside. People will be able to eat normal food and take showers, yet science is served. $\endgroup$ –
If a car moves at a certain speed, how fast is its wheel going?
The wheel is connected to the car through an axle which goes through the center of the circle that is our wheel. The point which is in contact with the ground is the instantaneous centre of rotation and that very point on the wheel has a speed of zero. Clearly the …
What makes a wheel spin? - Physics Stack Exchange
2020年1月30日 · Every point around the outside of a wheel is like a foot - with a vast number of feet around the outside of the wheel. When the wheel is not moving, it's like it's standing on the one foot at the bottom. When the wheel rolls, a new is foot coming down in front while the old foot goes up in back.
When the gyro moves down, does it spin faster?
2024年1月13日 · The other answer is correct that the gyro is not going to spin faster just as a skateboard wheel will not either when you drop the skateboard. The problem in your analysis is that what causes a gyro (or any wheel as mmesser314 says) to spin faster (or slower) is the torque about the axis of rotation.
If I wanted to slow down someone's aging by a factor of 100, …
2022年8月21日 · Furthermore, gravitational time dilation exists, so I would think an object with enough centripetal acceleration from a Ferris wheel could slow down someone's aging. If I wanted to slow down someone's aging by a factor of 100 relative to a normal person on the surface of the Earth, how fast would a 100 m diameter Ferris wheel have to be spinning?
kinematics - Why is the velocity on the top of a wheel twice the ...
A wheel rolling without slipping means, any point on the circumference of the wheel will have both rotatory motion and translatory motion. Due to translation, if the velocity of the vehicle is v m/s, then all the points of the wheel will have v m/s linear velocity in the forward direction.
newtonian mechanics - Why do wheels spin? - Physics Stack …
2016年4月1日 · There you can see the angular speed of the wheel ramps up extremely fast. That's what a wheel looks like without the torque from the road. But on the road it doesn't do this. That is, the force from the road balances almost the entire torque on the wheel bringing it close to zero. There is a little bit of torque that doesn't balance which is ...
angular momentum - Anti-gravity wheel? - Physics Stack Exchange
2020年8月15日 · Derek Muller mentions: if you have a gyroscope wheel with the spin axis in the horizontal plane (hence you get a torque from gravity), then when you push to give the wheel a surplus above the natural precessing motion the wheel will climb. (Conversely, when you push against the natural precessing motion the wheel will descend.)