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it slows down their speed
What kind of radiation? Remember, Beta radiation is particles (electrons)and Alpha radiation is Helium nuclei.Some radiation will transfer energy to particles ... which may speed them up,it may heat them,it may cause fluorescence.
A lot of mathematical problems about travelling distances, assume that you are travelling at a constant speed.
Whatever speed the wind is travelling.
Gravity and air resistance will both play a part. Air resistance is likely to reduce speed and gravity will cause the bullet to be pulled towards the ground.
Yes With a wind, yes; static air resistance, no.
Due to air resistance as the resistance is directly proportional to the speed but at certain speed called transitional speed or critical speed the resistance become directly proportional to square the speed so the resistance increase decreasing the falling speed.
Slow down and the temperature drops.
The speed of the molecules speeds up when the gas is heated.
You probably meant 'travelling faster than the speed of sound' since, according to most scientists, nothing can travel faster than the speed of light. It is most unlikely that any 'drop' of water could reach the speed of sound and thus break the sound barrier, since it would be slowed by wind resistance.
It would move slightly backwards due to no air resistance------------------------------------------------------- The above answer is rubbish. It would continue travelling forward. Whilst travelling forward it would also travel down. It would continue to travel forward until it slowed down to a zero forward speed ( DUE to air resistance ) but a terminal downward speed. Whether or not it would reach a zero forward speed and terminal downward speed would depend on how high it was when it was dropped.
Travelling faster than the speed of light is not possible, therefore no galaxies have travelled or are travelling faster than the speed of light.