All categories

3 years ago

Your friend tells you that a shiny element has to be a metal. Do you agreed? Explain your reasoning

2 answers:

3 0

no i dont agree, because a glass bowl is shiny but its not a metal. just because some metals are shiny doesnt make all metals shiny

Mila [183]3 years ago

3 0

Yes because nonmetals are dull but metals are shiny.
Metals are luster and no metals are not.

You might be interested in

I don’t know the answer to 4395g=________kg

monitta

4395g = 4.395 . divide it by 1000

5 0

3 years ago

Read 2 more answers

A horizontal beam of electrons initially moving at 4.0×10^7 m/s is deflected vertically by the vertical electric field between o

givi [52]

Answer:

$1.77\times 10^{-7}\ C/m^2$

0.000439077936334 m

Explanation:

q = Charge of electron = $1.6\times 10^{-19}\ C$

E = Electric field = $2\times 10^{4}\ N/C$

$\epsilon_0$ = Permittivity of free space = $8.85\times 10^{-12}\ F/m$

d = Distance between plates = 2 cm (assumed)

m = Mass of electron = $9.11\times 10^{-31}\ kg$

The beam consists of electrons which means it has negative charge this means the upper plates will be positive and the lower plate will be negative.

The direction is upper to lower lower plate.

$\epsilon_0$ = Permittivity of free space = $8.85\times 10^{-12}\ F/m$

Electric flux is given by

$\phi=\epsilon_0E\\\Rightarrow \phi=8.85\times 10^{-12}\times 2\times 10^{4}\\\Rightarrow \phi=1.77\times 10^{-7}\ C/m^2$

The charge per unit area on the plates is $1.77\times 10^{-7}\ C/m^2$

Deflection is given by

$s=\dfrac{1}{2}\dfrac{qE}{m}(\dfrac{d}{v})^2\\\Rightarrow s=\dfrac{1}{2}\dfrac{1.6\times 10^{-19}\times 2\times 10^4}{9.11\times 10^{-31}}(\dfrac{0.02}{4\times 10^7})^2\\\Rightarrow s=0.000439077936334\ m$

The deflection is 0.000439077936334 m

7 0

3 years ago

The Han Dynasty is best described as a:

inna [77]

Territory and nation

5 0

4 years ago

Give three examples about a force that deforms the shape of a body.

AURORKA [14]

Answer:

Squeezing of a plastic bottle changes the shape of the bottle.
Deformation of clay by pressing it between the two hands
stretching of rubber band

hope it becomes helpful to you ☺️☺️

good luck

8 0

3 years ago

Do I have to be good at math to be a physicist?

ioda

Yes, It does require some math skills.

3 0

4 years ago