Answer:
Note: Angle of reflection is the angle the ray makes with the Normal of the Mirror and NOT the Mirror Surface
Since the ray makes an angle of 22° with the Mirror surface
The angle it'll make with the Normal is 90-22(Because both are orthogonal)
So
Angle of Incidence = 90-22 = 68°
From the Law of Reflection
Angle of Incidence = Angle of Reflection
So
Angle of reflection = 68°
Explanation:
Answer: a)2.542cm
Explanation:
According to area expansivity which is defined as change in area per unit area for degree rise in kelvin.
Area expansivity= A2-A1/A1(¶2-¶1)
A2-A1 is change in area
¶2-¶1 is temperature change
A2 if final area
A1 is initial area
¶2 is final temp = 91°C
¶1 is initial temp= 26°C
coefficient of linear expansion for steel is 11 ✕ 10−6 (°C)−1.
Area of the spherical steel ball = Πd²/4
A1= Π×2.54²/4
A1 = 5.07cm²
Area expansivity = 2×linear expansion = 2×11 ✕ 10−6 (°C)−1.
= 22 ✕ 10−6 (°C)−1.
Substituting in the formula to get final area A2
22 ✕ 10−6 (°C)−1 = A2-5.07/5.07(91-26)
22 ✕ 10−6 (°C)−1 = A2-5.07/329.55
A2-5.07 = 0.0073
A2 = 0.0073+5.07
A2= 5.0073cm²
To get final diameter
A2=Πd²/4
5.0073=Πd²/4
20.309 = Πd²
d² = 20.309/Π
d²=6.46
d= √6.46
d= 2.542cm
DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.DNA testing relies on comparing fragments of DNA (called “genetic loci” or simply “loci”) between an alleged parent and a child. A child receives one half of his DNA from the mother and the other one from the father moreover, the process is more or less random.
Velocity of the mass after 11 seconds = ( value of the gravitational acceleration) * ( time )
velocity = ( 9.81 m / s^2 ) ( 11)
velocity = 107.91 meters per second