What is the exact meaning of croos section and cross sectional area of a conductor?

Answers

Answer 1

Answer: The cross section is the little tiny circle you see when you cut a wire
and look at the flat, cut end.

The cross-sectional area of the wire is the area of that little circle.
It's equal to

Area = (pi) x (1/4) x (Diameter of the wire)²

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State whether these questions are true or false.Q1) Distance formula is displacement/time T/F?Q2)velocity formula is = displacement/time T/F?
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When a machine is used to perform a task, work output is always more than work input. please select the best answer from the choices provided t f?

Answers

properly input current above 40 voltage or 100 for example elecrical fan machine is used to perform a task, work output is always more than work

What is the effect on Earth's atmosphere of a strong solar flare?

Answers

The Earth has a magnetic field which prevents the energetic charged particles (high-energy protons) and electromagnetic radiation (x-rays) to penetrate the Earth's atmosphere. However, despite the presence of magnetic field, there are still some noted effects of solar flare towards Earth. Solar flares cause the Earth's atmosphere to obtain high level of ions. There are also some disruptions in wireless communications when solar flares occurs. Another effect of solar flares which is considered of high beauty is the auroras. The magnetic field cannot prevent all charged particles produced from solar flares from penetrating the Earth's atmosphere. Some of this charged particles, specially the electrons, find their way at the poles, either the North or the South. These particles collide with the present particles in the atmosphere which causes friction among particles and glow.

A complete series circuit consists of a 12.0 V battery, a 4.70 O resistor, and a switch. The internal resistance of the battery is 0.30 O. The switch is open. What does an ideal voltmeter read when placed across the terminals of the switch?12.0 V
9.40 V
2.40 V
zero

Answers

With the switch open, there's no current in the circuit, and therefore
no voltage drop across any of the dissipative elements (the resistor
or the battery's internal impedance). So the entire battery voltage
appears across the switch, and the voltmeter reads 12.0V .

Which best describes the big bang theory? A. The universe is 4.6 billion years old. B. The universe is shrinking. C. Our universe is not the only universe. D. The universe is expanding.

Answers

The Big Bang Theory presents an explanation of the origin of the universe and is the most prevailing theory to date. According to the theory, the universe expanded from a state with a very high density which suddenly exploded and hurled matter to all directions. To this day, the expansion of the universe occurs and is supported by tons of evidences.

ANSWER: D. The universe is expanding.

The correct answer is letter D. The best statement that describes the big bang theory is that The Universe is Expanding. This is backed by the Doppler effect. Hope this answer helps! Good luck!

Which of the following families contains elements that will not form compounds?

Answers

The answer is:

noble gases will not form compounds.

The explanation:

-The noble gas family, all of the elements in Group Zero.

-The list of noble gases include helium(He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

- these elements don't like to react, we don't use them because of they have 8 valence electrons already and don't like to lose or gain electrons so, they will not form compounds.

Noble gases because they have 8 valence electrons already

Which of these is the unit of measure for work?a. watts
b. joules
c. pounds
d. newtons

Answers

The SI unit of measure for work, as well as
for all other kinds of energy, is the "joule".

Which of these is the unit of measure for work?

B. Joules

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