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2 years ago

Which of the following is the best name for CaF2?

Physics

2 answers:

nikdorinn [45]2 years ago

6 0

Its just Calcium Flouride because as you can see it is an Ionic bond (Ca is metal and fl is a gas usually)

Verdich [7]2 years ago

4 0

Answer: Option (a) is the correct answer.

Explanation:

When an atom donates electrons to another atom then it results in the formation of a bond known as ionic bond.

For example, atomic number of calcium is 20 and its electronic distribution is 2, 8, 8, 2. Whereas atomic number of fluorine is 9 and its electronic distribution is 2, 7. So, in order to attain stability calcium loses two electrons and fluorine will gain one electron.

Therefore, calcium will combine with two fluorine atoms resulting in formation of a $CaF_{2}$ compound known as calcium fluoride.

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The diameter of Mars is 6794km, and its minimum distance from the earth is 5.58×10^7 km. When Mars is at this distance, find the

pav-90 [236]

Answer:

D = 0.2374 m

Explanation:

let D be the diameter of the image of mars, f be the focal length of the telescope mirror and β be the spatial resolution.

β = 6794×10^3/(5.58×10^7) = 0.1217562724

then:

The diameter of the telescope mirror is given by:

D = f×β

= (1.95)×(0.1217562724)

= 0.2374 m

Therefore, the diameter of the image of mars is 0.2374 m.

4 0

2 years ago

A neighbor's child wants to go to a neighborhood carnival to experience the wild rides. The neighbor is worried about safety as

seraphim [82]

Answer:

No, the ride is not safe

Explanation:

From the diagram attached, it is seen that

$\sum f_{y} = 0$

$\tau cos \theta - W = 0$ ................(1)

$\sum f_{x} = 0$

$-ma + \tau sin \theta = 0$ .......(2)

$a = w^{2} r$

From the diagram, $r = Lsin \theta$

$a = w^{2} L sin \theta$

$w = \frac{2\pi }{T}$

$a = \frac{4\pi ^{2}L sin \theta }{T^{2} }$ ............(3)

Put (3) into (2)

$\tau sin \theta = \frac{4\pi ^{2}m L sin \theta }{T^{2} }$

$\tau = \frac{4\pi ^{2}m L }{T^{2} }$

w = weight of chair + weight of child = 50 + 10 = 60 lb

g = 32 ft/s²

m = w/g = 60/32 = 1.875

L = 30 ft

T = 3 secs

$\tau = \frac{4\pi ^{2}*1.875*30 }{0.3^{2} }$

$\tau = 246.74 lbs$

since 246.74 lbs > 200 lbs, it is not safe because the stationary chair will creak

6 0

2 years ago

Read 2 more answers

What is the energy of a photon of blue light with a wavelength of 460 nm?

kaheart [24]

Answer: $E=4.321(10)^{-19} J$

Explanation:

The energy $E$ of a photon is given by:

$E=h\nu$ (1)

Where:

$h=6.626(10)^{-34}\frac{m^{2}kg}{s}$ is the Planck constant

$\nu$ is the frequency light

On the other hand, there is an inverse relationship between $\nu$ and the wavelength $\lambda$ :

$\nu=\frac{c}{\lambda}$ (2)

Where:

$c=3(10)^{8} m/s$ is the speed of light

$\lambda=460 nm=460(10)^{-9}m$ is the wavelength

Substituting (2) in (1):

$E=\frac{hc}{\lambda}$ (3)

$E=\frac{(6.626(10)^{-34}\frac{m^{2}kg}{s})(3(10)^{8} m/s)}{460(10)^{-9}m}$

Finally:

$E=4.321(10)^{-19} J$ This is the energy of a photon of blue light, in Joules.

4 0

2 years ago

A train travels from over city to another its initial velocity is lower than its final velocity this is a example of

Anni [7]

I belive the answer is D)

4 0

2 years ago

Newton's third law states that for every action force there is an equal and opposite reaction force. An idiot in your class says

Otrada [13]

A. Because the third laws say that for every action force the is an equal and opposite reaction force

4 0

2 years ago

Read 2 more answers