Answer:
If a zero is found between important digits, it is important. Zeros are also used as (not salient) holders to the left of digits if the number is in fact a decimal. Example from www.rpi.edu: , a mass of 42 g has two significant digits. Expressed in kilograms, the mass of 0.042kg should still have two significant digits.
Explanation:
Zeros are also used as (not salient) holders to the left of digits if the number is in fact a decimal. Example from www.rpi.edu: "A mass of 42 g has two significant digits. Expressed in kilograms, the mass of 0.042kg should still have two significant digits."
Hope this comes in handy, have a great day!
Answer:
electric field formed we see that the field is uniform only for a sheet of uniform charge, so the correct answer is b
Explanation:
Let's analyze the shape of the electro field in each given configuration
i) a charge line.
Using Gauss's law the field varies inversely with the distance
E = 2K λ / r
ii) an infinite leaf. the electric field is
E = σ / 2ε₀
iii) two spherical shells
in this case the charge can be considered centered in the center of each shell and the electric field is
E = k q / r²
for each shel linterior
The outer shell does not create an electric field in the space between them
When examining each electric field formed we see that the field is uniform only for a sheet of uniform charge, so the correct answer is b
When two sprockets are in contact with each other then at the contact of sprockets the tangential velocity and tangential acceleration of the sprockets must be same.
Now we can say that tangential velocity is given as
v = Rw
here we know that
also we can say
x = width of each sprocket
So tangential speed is given as
now since tangential speed of two sprockets are same
given that
= 50
= 20 rpm
= 30
now from above equation
rpm
Answer:
Explanation:
When we want to decipher the chemical behavior of atoms, we consider the electrons in such an elements. Electrons are negatively charged particles and they are the reasons why chemical reactions proceeds. In nuclear reactions, the nucleons which are the protons and neutrons takes center stage.
For chemical bonds to form, atoms would want to mimic the configuration of the noble gases by either gaining or losing electrons. Some atoms also would share their electrons in order to have a more stable configuration.
Chemical bonds are formed using the valence or outermost shell electrons. The valence shell electrons have relatively low ionization energy compared to those of the inner orbitals.
For an atom with atomic number 12, its electronic configuration would be 2,8,2 with the sublevel notation written as 1S²2S²2P⁶3S²
This atom has 2 valence electrons in its valence shell.
The closest group 8 element to atom with atomic number of 12 is neon. Neon has an atomic number of 10 and its configuration is given as 2,8.
For our atom to be like Ne, it must be ready to lose two of the valence electrons.
Atom-12 would prefer to form an ionic bond because of its high electropositivity i.e ability to lose electrons.