Two wires are used to suspend a sign that weighs 500 N. The two wires make an angle of 100° between each other. If each wire is exerting an equal amount of force how much force does each wire exert?

Answers

Answer 1
Answer:

The force each wire exert will be "390.62 N".

The given values are:

Weight,

  • mg = 500 N

Angle,

  • θ = 100°

As we know,

The sum of vertical forces = 0

then,

\Sigma Fy = 0

Now,

F Cos (50) +F Cos (50) = mg

By substituting the value, we get

→                   2F Cos (50) = 500

→                                 F = (500)/(2 Cos (50))

→                                     = (500)/(2(0.64))

→                                     = 390.62 \ N  

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Each of us weighs a tiny bit less on the ground floor of a skyscraper than we do on the top floor. One reason for this is that _____. A. the gravitational field is shielded inside the building B. the mass of the building attracts you upward slightly C. both A and B D. none of the above

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B. the mass of the building attracts you upward slightly

What is the slope of the line if the rise of a line on a distance versus-time graph is 900 meters and the run is 3 minutes?

Answers

Slope = (rise) / (run) = (900 meters) / (3 minutes). / / / Slope = 300 meters/minute or 5 meters/sec.
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Tarzan swings on a 31.0 m long vine initially inclined at an angle of 36.0◦ with the vertical. The acceleration of gravity if 9.81 m/s 2 . What is his speed at the bottom of the swing if he a) starts from rest? Answer in units of m/s

Answers

Answer:

v=10.777m/s

Explanation:

Tarzan swing can be thought of as change in potential energy by going from higher location We solve for height of beginning of the swing by using simple cosine equation:

So

31Cos36=25.08\nE_(potential)=mgh\n

ΔE=mg(h₂-h₁)

=m*9.81(31-25.08)\n

The potential energy of Tarzan initial position is converted into kinetic energy of his swing.By using kinetic equation

E_(kinectic)=P_(potential)\n1/2mv^(2)=m*9.81(31.0-25.08)\n(1/2)v^(2)=9.81(31.0-25.08)\n0.5v^(2)=58.07\nv^(2)=58.07/0.5\nv=√(58.07/0.5)\n v=10.777m/s    

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it? I tried the answer "b." and that's not the right answer I guess.a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

b. Physicists develop mathematical equations to determine its physical nature.

c. The Big Bang theory provides the scientific guidelines to enable its study.

d. Scientists are able to gather samples from NASA.

Answers

Answer: a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Explanation:

Scientists cannot physically test their ideas about the origin of the universe but they use cosmological principles to study. Some aspects of the assumptions made on the basis of cosmological principle can be tested. Whatever was formed at the origin of the universe is present around us. Studies are made on them and conclusions are drawn.  

Cosmological principle states that on larger scale, the universe is homogeneous and isotropic. This means in which ever direction we look, its the same and there is no preference to any particular direction to make observations.

There are numerous theories associated with the origin of the universe but none can be proved. The theories can only be studied based on the assumptions made using the cosmological principle.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it?

a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Hope this helps.

Integrated circuits are manufactured on chips made of the element.

Answers

The "substrate" of the integrated circuit is super-pure silicon.

Integrated circuits are manufactured on chips made of the element ⇒ silicon.

What is true of an object pulled inward in an electric field?a) The object has a neutral charge.

b) The object has a charge opposite that of the field.

c) The object has a negative charge.

d) The object has a charge the same as that of the field.

Answers

Answer:

option b

Explanation:

There is an object pulled inward in an electric field.

We have to find out of the four options given which is true.

a) The object has a neutral charge is false since when electric field pulls the object inward, there is a charge inside.

b) The object has a charge opposite that of the field, this option is correct since there will be an equal and opposite charge created by the object

c) The object has a negative charge will be correct only if the original charge was positive hence wrong

d) The object has a charge the same as that of the field is incorrect since this would be opposite the charge

So only option b is right