Recent content by jester1989

so when you say, additional tension, you mean? also in the vid by prof lewin(have put in the times at the top), he did mention that the tension increases. [so that means i have misunderstood which tension he is talking abt] hmm..if let's say case 1: the wheel is not spinning, and it is...

hmm... there must be mistake in my thinking: -wheel puts torque on string(length of axle,r X weight of wheel) [nth to do with wheel spinning or not] - string puts torque on wheel(Newton's third law:tension in rope=weight of wheel) (so torque = length of axle X tension) since...

yup, you are right. upon impact(assume rock+pillar stick together ie. perfectly inelastic collision, momentum conserved, kinetic energy not conserved, lost as heat and sound). also, work done against friction between the sides of the pillar against the ground(as your pillar gains momentum and...

hi, thank you for any help. -[problem understanding angular momentum and Newton (second)2nd law] -[usual/classic problem of spinning bike wheel on rope doesn't fall] (from 28min:10s to 29min:15s and also 37:48 to 39:00)...

or...paper thin car and hole..with negliable(or NO) width

@john Sounds like you got length and width confused. If the direction of travel was into the hole then the side perpendicular to the direction of travel would be unaffected. This would be the side that would make the difference in being able to go in the hole or not, the unaffected side...

why would it still be smaller than the hole? if the stationary observer measures it again(when it is traveling at near speed now) but this time it is less than 1m, shouldn't it fall into the hole? sry if i seem slow. this concept is quite non intuitive.=x

the car's length is 2m, and the holes length is 1m, the hole's width>car's width.(since this doesn't contract. Car's direction of travel is parallel to the car's and hole's length.

will a 2m(rest length) car moving near lightspeed fall in a 1m hole?

Hey! read 1 of the TS original questions. super interesting. So if we have a 2m car, a 1m hole and an stationary observer. now the 2m car is accelerated to approx c. then the observer measures the car nw, it is less than 1m, will it fall into the hole? (since the hole is not moving wrt to...