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3 years ago

Select all that apply. a scientific theory _____. is true all the time is supported by evidence can evolve over time is a guess

2 answers:

5 0

A scientific theory is supported <span>by evidence. The correct option among all the options that are given in the question is the second option. The other choices are incorrect and can be neglected. he scientific theory is often backed by repeated experiments. I hope that this is the answer that has actually come to your help.</span>

Amiraneli [1.4K]3 years ago

4 0

Answer: Option (a) and (b) are the correct answers.

Explanation:

A scientific theory is defined as a well explained aspect of a real or natural world that is based of facts. These facts can be are repeatedly confirmed by observations and experiments.

Hence, a scientific will be always true as it will give the same result every time it is repeated.

For example, quantum theory is a scientific theory.

Therefore, we can conclude that a scientific theory is:

is true all the time.

is supported by evidence.

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PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Ivanshal [37]

If the wavelength increases (gets longer), then the frequency <em>decreases</em>.

(A wave occurs less often.)

7 0

3 years ago

A physics student with too much free time drops a watermelon from a roof of a building, hears the sound of the watermelon going

tatiyna

Answer:

28.6260196842 m

Explanation:

Let h be the height of the building

t = Time taken by the watermelon to fall to the ground

Time taken to hear the sound is 2.5 seconds

Time taken by the sound to travel the height of the cliff = 2.5-t

Speed of sound in air = 340 m/s

For the watermelon falling

$s=ut+\frac{1}{2}at^2\\\Rightarrow h=0t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow h=\frac{1}{2}\times 9.81\times t^2$

For the sound

Distance = Speed × Time

$\text{Distance}=340\times (2.5-t)$

Here, distance traveled by the stone and sound is equal

$\frac{1}{2}\times 9.81\times t^2=340\times (2.5-t)\\\Rightarrow 4.905t^2=340\times (2.5-t)\\\Rightarrow t^2=\frac{340}{4.905}(2.5-t)\\\Rightarrow t^2+69.3170234455t-173.292558614=0$

$t=\frac{-69.31702\dots +\sqrt{69.31702\dots ^2-4\cdot \:1\cdot \left(-173.29255\dots \right)}}{2\cdot \:1},\:t=\frac{-69.31702\dots -\sqrt{69.31702\dots ^2-4\cdot \:1\cdot \left(-173.29255\dots \right)}}{2\cdot \:1}\\\Rightarrow t=2.4158\ s\ or\ -71\ seconds$

The time taken to fall down is 2.4158 seconds

$h=\frac{1}{2}\times 9.81\times 2.4158^2=28.6260196842\ m$

Height of the buidling is 28.6260196842 m

7 0

4 years ago

Which is not an example of how an object gains elastic potential energy by stretching?

lora16 [44]

C because you don’t put a force of which you choose and the force wouldn’t be strong enough

4 0

4 years ago

Which form of radiation is used to directly INCREASE the temperature of water in a nuclear reactor?

LuckyWell [14K]

The answer would be D because is the strongest form of radiation

6 0

3 years ago

Read 2 more answers

Why does the Moon not have an atmosphere?

Elena-2011 [213]

Answer: Moon is much smaller in size and has very less mass, when compared to our mighty earth and there is absence of strong magnetic field on the moon which could protect from the incoming solar radiation from the sun. Since there is no magnetic field, it can swipe off any materials that are present there on the moon, diminishing the atmosphere.

This is the reason why moon does not have any atmosphere.

6 0

4 years ago