Radio, microwaves, infrared, and visible light are all used for communications.
Answer:
Answers are in the explanation
Explanation:
a)
vf² = vi² + 2gh
0 = vi² + 2(-9.8)(72)
vi = 37.57 m/s
b)
vf = vi + gt
0 = 37.57 - (9.8)t
t = 3.83 s
3.83 x 2 = 7.67 s
vf = vi + gt
vf = 37.57 - (9.8)(7.67)
vf = -37.60 m/s
c)
Its vertical velocity at the highest point is 0 m/s
The pressure at the depth h in the ocean is given by (Stevin's law)
where
is the atmospheric pressure
and
is the pressure exerted by the column of water of height h=4267 m, with
being the water density and
.
Substituting, we find
We want to convert this into atmospheres: we know that 1 atm corresponds to the atmospheric pressure at sea level, so
, therefore we just need to divide by this number:
Answer:
there is no drag in a vacuum (why is father in a vaccum)
Explanation:
there is nothing to hit and slow the object other than gravity like dust or air
Answer: If the woodpecker drums upon a tree 5 times in one second, then the frequency is 5 Hz; each drum must endure for one-fifth a second, so the period is 0.2 s.