What is dry ice ? what happens when the pressure under which it is stored is decreased to 1 atmosphere? ?

Dry ice is solid carbon dioxide  

Explanation:

It is not stored under pressure.

At 1 atm, it sublimates (changes directly from a solid to a gas) at  -78.5 °C.

Dry ice is nothing more than the solid form of .

Explanation:

It starts sublimating (goes from solid form directly to gas form) at -78.5º C, at a standard atmospheric pressure (1 atm), meaning can be preserved in its solid form at temperatures lower than -78.5º C.

Hope it helped,

BiologiaMagister

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(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied