Answer: The answer is C
Explanation:
i did it on usatestprep :)
Answer:
Nicolaus Copernicus
Explanation:
In 1543, Nicolaus Copernicus detailed his radical theory of the Universe in which the Earth, along with the other planets, rotated around the Sun. His theory took more than a century to become widely accepted.
I think the answer is option 2
Answer with Explanation:
It is given that
1) Force of Drag
2) Weight
Equating drag and weight we get
where,
'm' is mass of the object
'g' is acceleration due to gravity
'A' is the area of the person
is the density of air
Approximating the weight of a man to be 75 kg and area of man
Applying the values in the formula we get
Answer:
v = 27.456 m/s
Explanation:
The support pressure needed of the water in the straw can be calculated by the formula
Given that,
P = r*g*h
= 1000*9.8*0.05 Pa.= 490 Pa
This pressure is compensated by 0.5*r*v^2 of the air,
Hence,
0.5*1.3*v^2 = 490
velocity of air blown into the straw =
v = 27.456 m/s