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Ivan
3 years ago
7

Name two index fossils. Why are these fossils important to the practice of relative aging?

Physics
1 answer:
Inessa05 [86]3 years ago
8 0
Dinosaur and bird so u can see how they developed and how they aged to become something popular<span />
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the pitch that the average human can hear has a frequency of 20.0. If sound with this frequency travels through air with the spe
Natalka [10]

There are problems with the first sentence, and it's not really needed when
working with this question.  So let's just take the 20 (Hz ?) frequency from
the first sentence, and ignore the rest of it for right now.

           Wavelength = (speed) / (frequency) =

                                   (331 m/s) / (20 Hz) = <em>16.55 meters</em>.


8 0
2 years ago
Examine the graph. Select the statement that best describes the energy change in the particles of a substance during melting.
serg [7]

Answer:

B)  Absorbed energy results in the change in potential energy.

Explanation:

i got it wrong on usatestpreo

3 0
2 years ago
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Define Velocity with an example​
kolbaska11 [484]

Velocity stands for Displacement w.r.t time

\\ \bull\tt\longmapsto Velocity=\dfrac{Displacement}{Time}

Or

\\ \bull\tt\longmapsto v=\dfrac{ds}{dt}

  • It has units m/s.
8 0
2 years ago
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The speed that a tsunami can travel is modeled by the equation , where s is the speed in kilometers per hour and d is the averag
CaHeK987 [17]

The speed of tsunami is a.0.32 km. 

Steps involved  :

The equation s = 356d models the maximum speed that a tsunami can move at. It reads as follows: s = 200 km/h d =?

Let's now change s to s in the equation to determine d: s = 356√d 200 = 356√d √d = 200 ÷ 356 √d = 0.562 Let's square the equation now by squaring both sides: (√d)² = (0.562) ² d = (0.562)² = 0.316 ≈ 0.32

As a result, 0.32 km is roughly the depth (d) of water for a tsunami moving at 200 km/h.

To learn more about tsunami refer : brainly.com/question/11687903

#SPJ4

6 0
2 years ago
Which is heavier, humid air or dry air ?
zvonat [6]

Answer:

dry air is way heaver

Explanation:

5 0
3 years ago
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