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Paraphin [41]
3 years ago
11

True or false : Scientific theories have withstood the test of time and are accepted as proven fact.

Physics
2 answers:
Ilya [14]3 years ago
8 0
False:Laws are theories that have not been proven false.
Leviafan [203]3 years ago
7 0
False they are theories they haven't been proven
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The built-up beam is formed by welding together the thin plates of thickness 5 mm. determine the location of the shear center o.
atroni [7]

Answer:

The location of the shear center o is 0.033 or 33 m

Explanation:

Solution

Recall that,

The moment of inertia of the section is =  I = 0.05 * 0.4 ^3 /12 + 0.005 * 0.2 ^3/12

= 30 * 10 ^ ⁻⁶ m⁴

Now,

The first moment of inertia is

Q =ῩA = [ (0.1 -x) + x/2] (0.005 * x)

= 0.5x * 10 ^⁻³ - 2.5 x * 10⁻³ x²

Thus,

The shear flow is,

q =  VQ/I

so,

P =  (0.5x * 10 ^⁻³ - 2.5 x * 10⁻³ x²)/ 30 * 10 ^⁻⁶

P = (16.67 x - 83. 33  x²)

The shear force resisted by the shorter web becomes

Vw,₂ = 2∫ = ₀.₁ and ₀ = P (16.67 x - 83. 33  x²) dx = 0.11x

Then,

We take the moment at a point A

∑Mₐ = 0

- ( p * e)- (Vw₂ * 0.3 ) = 0

e =  0.11 p * 0.3/p

which gives us 0.033 m

= 33 m

Therefore the location of the shear center o is 0.033 or 33 m

Note: Kindly find an attached diagram to the question given above as part of the explanation solved with it.

4 0
3 years ago
after 2 hours the displacement of a car is 160km north the initial displacement of the car is 0. what is the average velocity of
gulaghasi [49]

Answer:

D

Explanation:

3 0
3 years ago
What is an atom? Give three 3 examples.​
Assoli18 [71]

Answer:

<u>Atom</u><u> </u><u>is </u><u>particle</u><u> </u><u>of </u><u>matter</u><u> </u><u>that </u><u>uniquely</u><u> </u><u>defines</u><u> </u><u>a</u><u> </u><u>chemical</u><u> </u><u>element</u><u>.</u>

Examples of atom:

  • Hydrogen [ H]
  • Neon [Ne]
  • Argon [A]
  • Iron [Fe]
  • Calcium [Ca]

<h3>About Atom:</h3>

Atom consists of a central nucleus that is usually surrounded by one or more electrons .Each electron is negatively charged. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

An early model of the atom was developed by the physicist Ernest Rutherford in 1913. He was the first to suggest that atoms are like miniature solar systems except that the attractive force is not caused by gravity, but by opposing electrical charged.

Hope this helps....

Good luck on your assignment...

8 0
3 years ago
Student 1 and student 2 talk about the speed of the truck
vodka [1.7K]

Answer:

Explanation:

any more explanation?

7 0
3 years ago
I need help with physics. Question 3 and 4. Thanks.
shusha [124]
It’s c and a I believe ask someone else to make sure but I’m pretty sure
6 0
3 years ago
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