Observe the figure below. The dashed red line with diamond symbols represents the monthly mean values, centered on the middle of
each month. The black line with the square symbols represents the same, after correction for the average seasonal cycle.
Why does the red line go up and down during the years?
I think the answer is because the average CO2 levels increase and decrease throughout the years.But I'm not sure if I'm correct in my thinking .
Why does the red line go up and down during the years?
I think the answer is because the average CO2 levels increase and decrease throughout the years.But I'm not sure if I'm correct in my thinking .
1 answer:
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Answer:
The average net force on the truck is 375 Newtons.
Explanation:
Using Newton's 3rd equation of motion, we have :
×a×s
where, v = final velocity = 25 m/s
u = initial velocity = 20 m/s
a = acceleration
s = distance traveled = 300 m
Using these values in the above equation, we get acceleration = 0.375 m/
Using Newton's second law, we have:
F=m×a
where m = mass = 1000 kg
a= acceleration = 0.375 m/
Putting values we have F=375 N
Answer:
A. The upward pressure gradient force is balanced by gravity.
Explanation:
A. is correct because the pressure difference is actually generated by gravity. As in the following formula for the pressure at different points:
where are the pressure at 2 points, ρ is the density of the fluid, g is the gravitational constant, and h is the height difference.
B is incorrect because friction in air is too small to make an effect.
C is incorrect because the Coriolis force is horizontal, not vertical.
D is incorrect because a difference of 500 hPa = 50000 Pa, this is half of the atmospheric pressure.
E is incorrect because temperature cannot generate force.