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3 years ago

What are fossil fuels made of?

1 answer:

8 0

Fossil fuels are made of decayed plants and animals by being exposed to extreme heat or pressure from the crust of earth!! Hope this helps

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Does a wave with the high-pitched have a very low frequency

xeze [42]

No it's the opposite, ths higher the pitch the greater the frequency.

3 0

2 years ago

Any help is appreciated please

stiv31 [10]

Answer:

C. It speeds up, and the angle increases

Explanation:

We can answer by using the Snell's law:

$n_i sin \theta_i = n_r sin \theta_r$

where

$n_i, n_r$ are the refractive index of the first and second medium

$\theta_i$ is the angle of incidence (measured between the incident ray and the normal to the surface)

$\theta_r$ is the angle of refraction (measured between the refracted ray and the normal to the surface)

In this problem, light moves into a medium that has lower index of refraction, so

$n_r < n_i$

We can rewrite Snell's law as

$sin \theta_r =\frac{n_i}{n_r}sin \theta_i$

and since

$\frac{n_i}{n_r}>1$

this means that

$sin \theta_r > sin \theta_i$

which implies

$\theta_r > \theta_i$

so, the angle increases.

Also, the speed of light in a medium is given by

$v=\frac{c}{n}$

where c is the speed of light and v the refractive index: we see that the speed is inversely proportional to n, therefore the lower the index of refraction, the higher the speed. So, in this problem, the light will speed up, since it moves into a medium with lower index of refraction.

4 0

3 years ago

A Tesla Roadster car accelerates from rest at a rate of 7.1m/s for a time of 3.9s

liberstina [14]

The distance covered is 54.0 m

Explanation:

Since the motion of the car is a uniformly accelerated motion, we can use the following suvat equation:

$s=ut+\frac{1}{2}at^2$

where

u is the initial velocity

t is the time

a is the acceleration

s is the distance covered

For the car in this problem, we have

u = 0 (it starts from rest)

$a=7.1 m/s^2$ is the acceleration

t = 3.9 s is the time

Substituting, we find s:

$s=0+\frac{1}{2}(7.1)(3.9)^2=54.0 m$

Learn more about accelerated motion:

brainly.com/question/9527152

brainly.com/question/11181826

brainly.com/question/2506873

brainly.com/question/2562700

#LearnwithBrainly

5 0

3 years ago

A block of mass m = 0.23 kg is set against a spring with a spring constant of k1 = 553 N/m which has been compressed by a distan

madreJ [45]

Answer:

$X_2 = 0.122m$

Explanation:

Using the law of the convervation of energy E:

$E_i = E_f$

so:

$\frac{1}{2}K_1X_1^2 = \frac{1}{2}K_2X_2^2$

where $K_1$ is the constant of the spring 1, $X_1$ the compressed of the first spring, $K_2$ is the constant of the second spring and $X_2$ is the compressed of the second spring.