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HNQ
2:50 AM
2
Q: Spherical mirrors or Parabolic mirrors?

user263638I am a high school student and have learnt about how curved surfaces reflect and refract (in "ray optics"). We were always told that these surfaces were spherical in shape, meaning they were an arc of a circle. However in mathematics, i have recently learnt the property that parabolic surfaces co...

 
 
2 hours later…
HNQ
5:19 AM
1
Q: The rays of light reaching us

A.M.Why doesn’t a ray of light which emitted by a distant galaxy, say about a thousand light years away, die down in between? I mean how the light rays from galaxies so far away reach us in this day and age, when emitted so long ago? Why isn’t it dampened and lost altogether? What drives the light ra...

 
 
7 hours later…
HNQ
12:16 PM
6
Q: Greatest distance between a particle moving with constant velocity and a particle moving with constant acceleration

Prajwal TiwariTwo particles start moving along the same straight line starting at the same moment from the same point in the same direction. The first moves with constant velocity $u$ and the second with constant acceleration $a$. During the time that elapses before second catches the first, the greatest dista...

 
 
9 hours later…
HNQ
8:51 PM
2
Q: Throwing a bottle containing pills to the air vertically

Master ShifuSuppose I have a bottle of pills and I throw the bottle in the air vertically. I wonder if the pills inside the box also fly up, or do they remain stable at the bottom of the bottle? I tried this experiment several times and I think the pills remain stable. I took the top of the bottle off and mo...

 

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