Answer:
Instead of pushing straight down, the load of an arch bridge is carried outward along the curve of the arch to the supports at each end. The weight is transferred to the supports at either end. These supports, called the abutments, carry the load and keep the ends of the bridge from spreading out.
Explanation:
There are many of gases in our atmosphere such as nitrogen, oxygen, argon, carbon dioxide, and trace amounts of neon, helium, methane, krypton, hydrogen, and as well as water vapor. These gases mix as they move throughout the atmosphere.
Answer:
need Read this excerpt from "Not a Dove, But No Longer a Hawk."
Despite these misgivings, I do not see how we can do anything but continue to prosecute the war. We can and should limit the violence and the suffering being inflicted on the civilians as much as possible, but for whatever reasons, successive Administrations in Washington have carried the commitment in Vietnam to the point where it would be very difficult to prevent any precipitate retreat from degenerating into a rout. If the United States were to disengage from Vietnam under adverse conditions, I believe that the resulting political and psychological shockwaves might undermine our entire position in Southeast Asia.
Which statement best describes the paradox in this excerpt?
The author acknowledges that civilians should not suffer, but states that the civilians must retreat.
The author suggests that the administrators in Washington are busy making policies while overlooking the need to end the war.
The author acknowledges that the violence should stop, but admits that a retreat might have dire consequences.
The author suggests that the Vietnamese people are counting on US support, though their political ideals are not democratic.
Explanation:
v = speed of the source of sound or the train towards the listener or switchman = 40 m/s
V = actual speed of sound = 340 m/s
f = actual frequency of sound as emitted from source or the train = 1000 Hz
f' = frequency as observed by the listener or by switchman = ?
Using Doppler's law , frequency observed by a listener from a source moving towards it is given as
f' = V f /(V - v)
inserting the values
f' = 340 x 1000 /(340 - 40)
f' = 340 x 1000/300
Your average speed was
(100 m) / (13.8 s) = 7.25 m/s .
If you finished 0.001s ahead of him, then at your average speed, that corresponds to
(7.25 m/s) x (0.001 s) = 0.00725 m
That's 7.25 millimeters ... about 0.28 of an inch !
NOTE:. I think this is only valid if your speed was a constant ~7.25 m/s all the way.
