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3 years ago

Why are experiments often performed in laboratories?

Physics

2 answers:

Reptile [31]3 years ago

8 0

The correct answer is B. You can control variables more easily.

Explanation:

In an experiment, scientists or researchers need to keep most of the variables or factors constant because only by doing this they can study the main factor or variable (dependent variable) in relation to the variable that is manipulated by the researcher (independent variable).

All of this is quite challenging in natural spaces because there are many variables and these cannot be controlled. For example, if the scientist wants to study how air humidify affects plant growth he/she needs to consider and control other factors such as light exposure, soil, weather changes, among others. On the opposite, in a laboratory or artificial environment, these variables can be more easily controlled as these are created by the scientist and not by nature. Thus, the reason experiments are often performed in laboratories is "You can control variables more easily".

kap26 [50]3 years ago

4 0

In my opinion,I think the answer is b.You can control variables more easily by doing different things for different purposes.

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Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.0

zloy xaker [14]

Answer: $278\ Hz$

Explanation:

Given

Distance between two speakers is 8 m

Man is standing 12 away from the wall

When the person moves 3 parallel to the wall

the parallel distances from the speaker become 4+3, 4-3

Now, the difference of distances from the speaker is

$\Delta d=\sqrt{12^2+(4+3)^2}-\sqrt{12^2-(4-3)^2}\\\Delta d=1.85\ m$

Condition for destructive interference is

$\Delta d=(2n-1)\dfrac{\lambda }{2}=(2n-1)\dfrac{\nu }{2f}\\\\\Rightarrow f=(2n-1)\dfrac{v}{2\Delta d}$

for second destructive interference; n=2

$\Rightarrow f=(2\times 2-1)\dfrac{343}{2\times 1.85}=278.10\approx 278\ Hz$

4 0

3 years ago

6–3 The current through a 0.1‐μF capacitor is a rectangular pulse with an amplitude of 2 mA and a duration of 5 ms. Find the cap

Hatshy [7]

Answer:

999 V

Explanation:

Charge deposited on the capacitor

= current x time

= 2 x 10⁻³ A x 5 x 10⁻³

= 10⁻⁵ C

increase in volt = charge deposited / capacitance

10⁻⁵ / .1 x 10⁻⁶

= 10² V

= 100 V

voltage in the beginning = -1 V

voltage at the end

= -1 + 100

99 V .

8 0

4 years ago

Which list accurately identifies the hierarchy of space from largest to smallest? Solar system, galaxy, planet, universe Galaxy,

Oliga [24]

<h3><u>Answer;</u></h3>

Universe, galaxy, solar system, planet, moon

<h3><u>Explanation;</u></h3>

<u>A galaxy</u>, such as our Milky Way Galaxy, is a collection of solar systems orbiting around a central core.
<u>A solar system</u> consists of a star, normally the sun and all of its planets, asteroids, comets and other bodies.
<u>A planet</u> is a nearly spherical body which is in orbit around the Sun. Planets are larger than moons.
<u>Moons</u> are typically rocky bodies which are in orbit around planets.

8 0

3 years ago

Read 2 more answers

Distinguish between physical and chemical changes. Include examples in your explanations.

hram777 [196]

Answer:

<u>Chemical changes</u> are recognized when a substance changes its properties permanently and it cannot be the same substance as before.

Instead the<u> physical changes</u><u> </u>implies that if you can return to the same substance through a reverse process.

Explanation:

A chemical change is, by example, a combustion, if a sheet of paper burns, its result is ashes, the ashes cannot go back to being a sheet of paper because its properties changed, heat energy was generated that changed matter permanently.

A physical change, by example, is that of freezing water, the water becomes ice, but this can easily become water again if the temperature is increased, its properties do not change and the chemistry of the substance does not change.

6 0

3 years ago

List six forms of electromagnetic radiation from the shortest waves(highest energy) to the longest waves (lowest energy)

romanna [79]

That's the reverse of RIVUXG
so your answer is
gamma rays
x rays
ultraviolet light
visible light
infrared
radio waves

8 0

3 years ago