Explanation:
you add the from head to tail. Head is the triangle and tail is the final point of the vector
1. 
The frequency of a photon is given by:
where
c is the speed of light
is the wavelength
The wavelength of the photon in this problem is
So, the frequency of the photon is
2. 
The energy of a photon is given by
where
h is the Planck constant
f is the frequency of the photon
The frequency of the photon in this problem is
so its energy in Joules is
And since
The energy in eV is
Answer:
<em>UP</em>
Explanation:
heat flows from higher level to lower level
( higher concentration to lower concentration )
and since temperature in above block is less than the lower block, the heat will flow from lower block to higher block .
( Up )
the equation of the tangent line must be passed on a point A (a,b) and
perpendicular to the radius of the circle. <span>
I will take an example for a clear explanation:
let x² + y² = 4 is the equation of the circle,
its center is C(0,0). And we assume that the tangent line passes to the point
A(2.3).
</span>since the tangent passes to the A(2,3), the line must be perpendicular to the radius of the circle.
<span>Let's find the equation of the line parallel to the radius.</span>
<span>The line passes to the A(2,3) and C (0,0). y= ax+b is the standard form of the equation. AC(-2, -3) is a vector parallel to CM(x, y).</span>
det(AC, CM)= -2y +3x =0, is the equation of the line // to the radius.
let's find the equation of the line perpendicular to this previous line.
let M a point which lies on the line. so MA.AC=0 (scalar product),
it is (2-x, 3-y) . (-2, -3)= -4+4x + -9+3y=4x +3y -13=0 is the equation of tangent
Answer:
180 cm, what
2. The triangular side walls of a flyover have been used for advertisements. Theses
the walls are 122 m, 22 m and 120 m (see Fig. 12.9). The advertisements a
earning of 5000 per m per year: A company hired one of its walls for 3 months
much rent did it pay
Explanation:
