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3 years ago

9. Which of the following statements is true about scientific theories?

2 answers:

6 0

I think the correct answer from the choices listed above is option D. Scientific theories summarize patterns found in nature. Although, the statement scientific theories are never proven is somewhat true. They are either disproved or they are never disproved. Hope this answers the question.

pochemuha3 years ago

3 0

Correct answer choice is :

B) Scientific theories are never proven.

Explanation:

A scientific theory is a well-substantiated description of some features of the natural world, based on a body of evidence that has been frequently authenticated through investigation and experimentation. Such fact-supported hypotheses are not conclusions but authentic statements of the actual world. A scientific theory may be changed and eventually discarded if it cannot be done to fit the new conclusions in such conditions, a more precise theory is then needed.

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In a vacuum, two particles have charges of q1 and q2, where q1 = +3.2 µC. They are separated by a distance of 0.28 m, and partic

NARA [144]

Answer:

q2 = - 8 × $10^{-6}$ C

negative sign because attract together

Explanation:

given data

q1 = +3.2 µC = 3.2 × $10^{-6}$ C

distance r = 0.28 m

force F = 2.9 N

to find out

q2 (magnitude and sign)

solution

we know that here if 2 charge is unlike charge

than there will be electrostatic force of attraction , between them

now we apply coulomb law that is

F = $\frac{q1q2}{4\pi \epsilon *r^{2}}$ ............1

here we know $\frac{1}{4\pi \epsilon}}$ = 9 × $10^{9}$ Nm²/C²

so from equation 1

2.9 = 9 × $10^{9}$ × $\frac{3.2*10^{-6}*q2}{0.28^{2}}$

q2 = $\frac{2.9*0.28^2}{9*10^9*3.2*10^{-6}}$

q2 = - 8 × $10^{-6}$ C

4 0

3 years ago

A box moves 1000 m horizontally as a force F 2000 N is applied downward. What is the work done on the box by F during the displa

stiks02 [169]

Answer:

D. OJ

Explanation:

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3 years ago

Which of the following best describes a property of water?

stiks02 [169]

Correct answer is option C.

Remaining liquid over a wide temperature range

Other options are invalid.

3 0

3 years ago

Read 2 more answers

Which object has the most Kinetic Energy, and why?

Ilya [14]

A small rock quickly rolling down a hill because as the velocity or speed increases the particles in the rock start to increase kinetic energy. The particles start to act up and create more energy. Also because the small rock would go faster than a giant rock because of Newton's second law. Can I have brainliest pls?

6 0

3 years ago

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A spring is 20cm long is stretched to 25cm by a load of 50N. What will be its length when stretched by 100N. assuming that the e

IgorLugansk [536]

Answer:

Final Length = 30 cm

Explanation:

The relationship between the force applied on a string and its stretching length, within the elastic limit, is given by Hooke's Law:

F = kΔx

where,

F = Force applied

k = spring constant

Δx = change in length of spring

First, we find the spring constant of the spring. For this purpose, we have the following data:

F = 50 N

Δx = change in length = 25 cm - 20 cm = 5 cm = 0.05 m

Therefore,

50 N = k(0.05 m)

k = 50 N/0.05 m

k = 1000 N/m

Now, we find the change in its length for F = 100 N:

100 N = (1000 N/m)Δx

Δx = (100 N)/(1000 N/m)

Δx = 0.1 m = 10 cm

but,

Δx = Final Length - Initial Length

10 cm = Final Length - 20 cm

Final Length = 10 cm + 20 cm

<u>Final Length = 30 cm</u>

6 0

3 years ago