Which of the following diagrams represent a balanced force

1. A(n) ___________ forms when atoms share one or more pairs of electrons.

Nitella [24]

1.COVALENT BOND [c] 2. Ionic bond [d] 3. Ionic bond [d] 4. a reaction where energy is released [b] 5. 2FE2C03=4FE=3CO2 [a] 6. The mass of reactant must be equal to the number of mass of the product [a] 7. Valence electrons [a] 8. Atomic number [a] 9. combustion [c] 10. More nitrogen in the nitrogen cycle [a]

8 0

2 years ago

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A coil of wire is comprised of 5 turns, has a current of 2 mA running through it, and a net magnetic field at its center of B is

VARVARA [1.3K]

Answer:

20cm

Explanation:

A coil wire comprises of 5 turns, it has a current of 2mA 

A net magnetic field at the center of B is equal to Mu over 40 end fractions times T

The radius of a coil of wire with N turns is r = 0.28 m. A clockwise current of Icoil = 1.0 A flows in the coil,

Therefore 40/2mA = 20

6 0

2 years ago

What is the efficiency of a machine if your work on the machine is 1200 j and the machines output work is 300 j?

inysia [295]

Answer:

The efificiency is 0,25 of the machine (25%). See the explanation below

Explanation:

We calculate the efficiency with this formula:

Efficiency = energy obtained/energy supplied= 300 Joule/1200 Joule

Efficiency= 0,25

Efficiency(%) = 0,25 x100 = 25%

7 0

2 years ago

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Any one help me in 12year physics tell about important long question

aleksley [76]

I don’t want a kiss thank you

5 0

2 years ago

Why is the gravitational force usually ignored in problems involving particles such as electrons and protons?

Studentka2010 [4]

Answer:

Because the mass of electrons and protons is very small

Explanation:

The gravitational force exerted between two objects is given by:

$F=G\frac{m_1 m_2}{r^2}$

where

$G=6.67 \cdot 10^{-11} m^3 kg^{-1} s^{-2}$ is the gravitational constant

m1 and m2 are the masses of the two objects

r is the distance between the two objects

The mass of a proton and of an electron is very small, so the gravitational force involved in case of such particles is very weak. Let's calculate for example the gravitational attraction between one proton and one electron at a distance of r = 1 m. We have:

- Proton mass: $m_1 = 1.67 \cdot 10^{-27}kg$

- Electron mass: $m_2 = 9.11\cdot 10^{-31}kg$

So, the gravitational force between the two particles is:

$F=(6.67\cdot 10^{-11} m^3 kg^{-1} s^{-2})\frac{(1.67\cdot 10^{-27}kg)(9.11\cdot 10^{-31} kg)}{(1 m)^2}=1.01\cdot 10^{-67}N$

Which is a very weak force.

By comparison, let's calculate instead the electromagnetic force between a proton and an electron (both having a charge of $q=1.6\cdot 10^{-19}C$ ) still separated by a distance of r = 1 m. We have:

$F=k\frac{q_1 q_2}{r^2}=(9.0\cdot 10^9 Nm^2C^{-2})\frac{(1.6\cdot 10^{-19}C)(1.6\cdot 10^{-19}C)}{(1 m)^2}=2.3\cdot 10^{-28}N$

Which we see is much stronger than the gravitational force (almost by a factor $10^{40}$

4 0

3 years ago