Answer:
Technician A
Explanation:
It is seen that a tire pressure will increase or decrease 1 psi for each 
change in temperature.
For Technician B vehicle pressure should not be adjusted after tire has been warmed as the warm air may increase the pressure but it will be auto adjusted as the temperature falls to normal .
Explanation:
The kinetic energy is said to be possessed due to the motion of the object. An object at rest will have zero kinetic energy and if it is in motion it will have some kinetic energy. The mathematical expression for kinetic energy is given by :
...........(1)
Where
m is the mass of the object
v is the velocity of object
It is clear form expression (1) that the kinetic energy of the object is directly proportional to the mass and velocity of an object.
So, the hypothesis for the mass and kinetic energy can be written as " when the mass of the object increases, its kinetic energy also increases because there exists a direct relationship between the mass and the kinetic energy of the object".
Question 18: a
question 19: b
question 20: c
Answer:
the ans is D... good luck
Answer:
a) <em>473.33 nm
</em>
<em>b) 568 nm</em><em> and </em><em>406 nm</em>
<em>c) </em>bluish green and blue
Explanation:
a) As the light traverses the layer of oil it first reflects at the front surface of the oil. Here the index of refraction increases from that of air to that of the oil , so a phase change occurs. The light then reflects from the rear surface of oil. The index of refraction increases from that of the oil to that of the glass , so again a phase change occurs. Thus two phase changes occur.
In thin-film interference with 0 or 2 phase changes, condition for constructive interference is:
2t=mλ/n
So:
λ=
2tn/m
<em><u>For m=1</u></em>
λ=1420 nm
<em><u>For m=2</u></em>
λ=710 nm
<em><u>For m=3</u></em>
λ=473.33 nm
<em><u>For m=4</u></em>
λ=355 nm
<em>Thus the only wavelength in the visible spectrum </em><em>(400 - 700 nm)</em><em> that will give constructive interference is </em><em>473.33 nm
</em>
b)
In thin-film interference with 0 or 2 phase changes, condition for destructive interference is:
2t=(m+1/2)λ/n=(2m+1)*λ/2n
so;
λ=4tn/(2m+1)
<em><u>For m=1</u></em>
λ=946.667 nm
<em><u>For m=2</u></em>
λ=568 nm
<em><u>For m=3</u></em>
λ=405.33 nm
<em><u>For m=4</u></em>
λ=315.56 nm
<em>Thus the wavelengths in the visible spectrum (</em><em>400 to 700 nm)</em><em> that will give destructive interference are </em><em>568 nm</em><em> and </em><em>406 nm</em>
<em>c) </em>The color of reflected light is bluish green since the wavelength is 473.3 nm . We know that the colors of reflected and transmitted light are complimentary to each other.Thus the color of transmitted light is blue (due to the combination of wavelengths 568 nm (green) and 406 nm (deep violet).
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