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USPshnik [31]
3 years ago
7

An experiment measures the growth of crystals in a liquid solution aboard the space shuttle. A collection of bottles has the liq

uid in varying strength, or concentration of the tested substance. What would be a control observation in this experiment?
A. the bottle with 0% concentration
B. the bottle with the weakest concentration
C. the bottle with the strongest concentration
D. the bottle with the medium amount of concentration
Physics
2 answers:
Fantom [35]3 years ago
7 0

the control would be A. the bottle with 0% concentration, because you're not changing anything.

gayaneshka [121]3 years ago
7 0

Answer:

A. the bottle with 0% concentration

Explanation:

In teh bottle with the 0% concentration you can create a control observation of the experiement to see how it beheaves even if it has no concentration and if it really depend on the substance added or is something that happens naturally in those environments.  Remember that when doing experiments you should always have a sample of the subject that is given nothing in order to observe the normal behaviour of the subject under no studies.

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A 5.67-kg block of wood is attached to a spring with a spring constant of 150 N/m. The block is free to slide on a horizontal fr
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Answer:

v=0.94 m/s

Explanation:

Given that

M= 5.67 kg

k= 150 N/m

m=1 kg

μ = 0.45

The maximum acceleration of upper block can be μ g.

 a= μ g                          ( g = 10 m/s²)

The maximum acceleration of system will ω²X.

ω = natural frequency

X=maximum displacement

For top stop slipping

μ g  =ω²X

We know for spring mass system natural frequency given as

\omega=\sqrt{\dfrac{k}{M+m}}

By putting the values

\omega=\sqrt{\dfrac{150}{5.67+1}}

ω = 4.47 rad/s

μ g  =ω²X

By putting the values

0.45 x 10 = 4.47² X

X = 0.2 m

From energy conservation

\dfrac{1}{2}kX^2=\dfrac{1}{2}(m+M)v^2

kX^2=(m+M)v^2

150 x 0.2²=6.67 v²

v=0.94 m/s

This is the maximum speed of system.

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