M = 4kg
F =8N
a..?
F =m.a
8 = 4.a
a = 2m/s^2
Answer:
C) A ratio based on the mass of a carbon-12 atom
Explanation:
For each element, there is a characteristic number of protons, this number represent a type of atom and its called the atomic number
On the other hand we have the number of neutrons, and for one element which difers only on the number of neutrons, we have different isotopes from one element.
Together, protons and neutrons define the mass number
One property linked with the mass number, is the atomic mass, which is formerly expressed as "uma" (atomic mass unit)
By definition, one atom of carbon-12 (with 6 neutrons) has an atomic mass of 12 umas
Answer:
average speed = 1.73m/s
average velocity = 3.33m/s
Explanation:
<em>we'll</em><em> </em><em>find</em><em> </em><em>the</em><em> </em><em>average</em><em> </em><em>speed</em><em> </em><em>first</em>
<em>average</em><em> </em><em>speed</em><em> </em><em>=</em><em> </em><em>total</em><em> </em><em>distance</em><em> </em><em>/</em><em> </em><em>total</em><em> </em><em>time</em><em> </em>
<em>his</em><em> </em><em>total</em><em> </em><em>distance</em><em> </em><em>is</em><em> </em>300m + 100m
= 400m
and total time should be taken in seconds as you know
((2×60)+50) + 60s
= 230s
so let's divide,
400m/230s
1.73 m/s
next, mean velocity
that is,
mean velocity = final- initial displacement/time
we have to note <em>displacement</em><em> </em>( this is the distance between the initial point to final point) here
the displacement is 300-100
so, 200m
we already calculated total time
but that cant be taken here
230 - 170
is the original time to travel 200m
that is, 60s
so we divide
200/60
3.33m/s
Answer:

Explanation:
r = Radius of atom = 
m = Mass of chlorine atom = 
= Angular speed = 
The moment of inertia of the system is given by

Kinetic energy is given by

The rotational kinetic energy of one molecule of the atom is 
Answer:
Wavelength at which the light reflected by the film is brightest = 567.5 nm
Explanation:
We are given;
index of refraction n2 = 1.33
Thickness;(t) = 320 nm
Now the wavelength at which the light reflected by the film is brightest is gotten from the formula for path difference in critical interference as;
Path difference = (m + ½)(λ/n)
Where;
path difference = 2 x thickness = 2(320) = 640 nm
λ = Wavelength at which the light reflected by the film is brightest
n is Refractive index
m is an integer = 0,1,2,3...
Thus; at m = 0;
We have;
640 = (0 + ½)(λ/1.33)
640 = (λ/2.66)
λ = 640 x 2.66
λ = 1702.4 nm
at m = 1;
We have;
640 = (1 + ½)(λ/1.33)
640 = (3/2)(λ/1.33)
λ = 640 x 1.33 x 2/3
λ = 567.5 nm
at m = 2;
We have;
640 = (2 + ½)(λ/1.33)
640 = (5/2)(λ/1.33)
λ = 640 x 2 x 1.33/5
λ = 340.5 nm
Since we are told that the wavelength is between 400 – 690 nm.
Thus, the wavelength at which the light reflected by the film is brightest is the higher value gotten that is between 400nm and 690nm.
Thus, Wavelength at which the light reflected by the film is brightest = 567.5 nm