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3 years ago

What row of the periodic table does this element belong?

Physics

1 answer:

sladkih [1.3K]3 years ago

3 0

Answer:

Group 18

Explanation:

This element has a full octet, therefore it is a noble gas, being in period 18. (I think its Argon if you need that too)

Hope that helps

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A nail is hit with a hammer. Which type of contact force has been applied?

Mademuasel [1]

Applied force I think.

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3 years ago

Read 2 more answers

When two nonmetallic-sheathed cables (Type NM-B) enter a box, is it permitted to bring both of the bare equipment grounding cond

coldgirl [10]

Answer:

Not permitted

Explanation:

It's totally unacceptable to bring both of the bare equipment grounding conductor directly with the grounding terminal of a receptacle because of grounding connection removal and receptacle.

When circuit conductors are terminated on equipment within a metal box, the equipment grounding conductor associated with those circuits must be connected to box to avoid unnecessary discharge of current.

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3 years ago

A positive charge of 18nC is evenly distributed along a straight rod of length 4.0 m that is bent into a circular arc with a rad

sergey [27]

Explanation:

Formula for angle subtended at the center of the circular arc is as follows.

$\theta = \frac{S}{r}$

where, S = length of the rod

r = radius

Putting the given values into the above formula as follows.

$\theta = \frac{S}{r}$

= $\frac{4}{2}$

= $2 radians (\frac{180^{o}}{\pi})$

= $114.64^{o}$

Now, we will calculate the charge density as follows.

$\lambda = \frac{Q}{L}$

= $\frac{18 \times 10^{-9} C}{4 m}$

= $4.5 \times 10^{-9} C/m$

Now, at the center of arc we will calculate the electric field as follows.

E = $\frac{2k \lambda Sin (\frac{\theta}{2})}{r}$

= $\frac{2(9 \times 10^{9} Nm^{2}/C^{2})(4.5 \times 10^{-9}) Sin (\frac{114.64^{o}}{2})}{2 m}$

= 34.08 N/C

Thus, we can conclude that the magnitude of the electric eld at the center of curvature of the arc is 34.08 N/C.

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3 years ago

Please answer like this :<br> 1 :<br> 2 :<br> 3 :<br> 4 :

coldgirl [10]

1: a system is a collection of two or more things/objects. but if you want to use a tennis ball for an example it would be considered an object but at an atomic level we could say it is a system. why? because, it is made up of millions of atoms and each and every atom could be considered an object
2: phone systems, ecological systems, space systems
3: the internal energy of the system can be understood by examining the simplest possible system. example: an ideal gas
4: electricity- by an electrical current.

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3 years ago

A brick is dropped from rest from a height of 4.9 m. How long does it take for the brick to

noname [10]

Answer:

t=1s

Explanation:

Using the formula

s=ut+1/2at^2

4.9 = (0)(t) + 1/2(9.8)(t^2)

4.9 = 4.9(t^2)

t^2 = 1

t = 1

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3 years ago