# Thread: New querries from my side

1. My new querries

1- How many signifcant figures are in 1000?

2- I am in freely falling alevator , moving wih speed of gravity downwards. i have ball in my hand, if i drop it. then what will happen?

3- Why Is There A Limit To How Cold It Gets But No Limits On How Hot it gets?
related link: Why Is There A Limit To How Cold It Gets But No Limits On How Hot It Gets? - Find Answers to this Question

4- Easiest way to decrease 24 hour day time (one rotation of earth about its axis) ( "reducing diameter of earth" or by "increasing/reducingspeed of rotation of earth")

2.

3. 1) 1 sig fig
2) It will fall at the same speed as you
3) Because absolute zero is defined by the complete absence of molecular motion. You cannot have negative motion.

4. Originally Posted by sir ir r aj
3- Why Is There A Limit To How Cold It Gets But No Limits On How Hot it gets?
related link: Why Is There A Limit To How Cold It Gets But No Limits On How Hot It Gets? - Find Answers to this Question
Originally Posted by Flick Montana
3) Because absolute zero is defined by the complete absence of molecular motion. You cannot have negative motion.
what is negative motion? new for me.
Originally Posted by sir ir r aj
4- Easiest way to decrease 24 hour day time (one rotation of earth about its axis) ( "reducing diameter of earth" or by "increasing/reducing speed of rotation of earth")
Originally Posted by Flick Montana
right. ! fantastic

5. Originally Posted by sir ir r aj
4- Easiest way to decrease 24 hour day time (one rotation of earth about its axis) ( "reducing diameter of earth" or by "increasing/reducingspeed of rotation of earth")
Decreasing the diameter would speed up rotation due to conservation of angular momentum (the usual example is an ice skater tucking in her arms to spin faster, then extending them to slow down) and lead to a shorter day.

But, of course, doing that is not "easy" (even though a few million tons of dust falls on the Earth every day).

6. Originally Posted by sir ir r aj
Originally Posted by Flick Montana
3) Because absolute zero is defined by the complete absence of molecular motion. You cannot have negative motion.
what is negative motion? new for me.
Imagine you're running along, then you slow down to a jog, then you slow down to a walk, and you keep slowing down until you get to a complete stop.

You can't go "slower" than a complete stop, because even if you started walking backwards, you'd be moving again.

Temperature can be measured by the speed at which atoms and molecules move and vibrate. A complete stop would be absolute zero, with no atomic movement whatsoever. You can't go slower than a complete stop, so you can't get colder than absolute zero.

Even if the atoms and molecules started vibrating in the "opposite" direction, they'd be moving again and so develop a detectable temperature, and thus be warmer than absolute zero (not colder).

This movement wouldn't be "negative motion" it would simply be ordinary motion.

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