2 years ago

Whats evidence do scientists use to support the theory of plate tectonics

Physics

1 answer:

myrzilka [38]2 years ago

7 0

Scientists don't use evidence to support theories. Theories are offered to explain evidence.

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What instrument uses a magnetic field to magnify imags up to 100000000?

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Transmission electron microscope

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Elias observed a sample in the classroom. The sample was a liquid at room temperature. He performed a conductivity test and foun

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Answer:

Explanation:

Nonmetals are poor conduster to heat and electricity

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2 years ago

You are in a hot-air balloon that, relative to the ground, has a veloc- ity of 6.0 m/s in a direction due east. You see a hawk m

Ann [662]

Answer:

6.32 m/s 18.43° northeast

Explanation:

We express the velocity of hawk as:

$v_{Hawk}=v_{balloon}+v_{HawkRelativetoBalloon}=6 x+2 y$

We consider positive x towards east and positive y due north. So the magnitude is simply the square root of the square components:

$|v_{hawk}|=\sqrt[]{6^2+2^2}=\sqrt{40}$ ≈ $6.32 m/s$

And the angle with respect to the east should be with:

$arctan(\frac{2}{6} )=18.43 \°$

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2 years ago

A railroad train is traveling at 32 m/s in still air. The frequency of the train whistle is 350 Hz. What is the wavelength of th

FinnZ [79.3K]

Answer:

0.9 m,386.36 Hz

Explanation:

We are given that

Speed of train,vs=32 m/s

Frequency of whistle,f0=350 Hz

We have to find the wavelength of sound and the frequency of heard by the listener in front of the locomotive.

Speed of sound= $v=340 m/s$

We know that the frequency of listener

$f=f_0(\frac{v}{v-v_s})$

Using the formula

$f=350\times(\frac{340}{340-32})$

$f=386.36 Hz$

Wavelength, $\lambda=\frac{v}{f}$

Using the formula

$\lambda=\frac{340}{386.36}=0.9 m$

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2 years ago

Summary about down hill on a bicycle story

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Answer:

The poem, Going Down the Hill on a Bicycle, written by Henry Charles Beeching describes the thrilling ride of a boy going downhill. ... The poet mentions how he lifts his feet from the pedals and keeps his hands still so that he would not lose his balance and fall off the bicycle, while it is dashing down the hill.

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2 years ago