payshencec21
29.10.2019 •
Physics
Match the letter with the term
a. nitrogen
b. trace gases
c. ozone (in upper atmosphere)
d. carbon dioxide
e. oxygen
1. this gas is essential to the nutrition of plants and animals; present in all proteins and dna in all organisms; acts to dilute atmospheric oxygen to prevent uncontrolled combustion.
2. this gas is used by all living things; essential for respiration; necessary for combustion or burning.
3. plants use this gas in photosynthesis to make oxygen; prevents some infrared heat loss from earth's atmosphere.
4. neon, helium, krypton, and xenon - don't do much
5. this gas absorbs and scatters ultraviolet light preventing it from reaching the surface.
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Ответ:
c = 5
b = 4
d = 3
e = 3
a = 1
Ответ:
Explanation:
The question says that, "After how long does a mobile acquire a speed of 30 m / s, if it starts from rest and its acceleration is 3 m / s*2"
Initial speed is 0
Final speed is 30 m/s
Acceleration a = 3 m/s²
It is required to find time when it acquire a speed of 30 m/s. Using equation of kinematics as :
So, after 10 seconds it will acquire a speed of 30 m/s.