Part a. and part b. are definitely correct
To do part c. you have to take into account that a triangle is 180degrees. So angle 1= 70, angle 2= 65 so angle 1+ angle 2+ angle 7=180degrees
angle 7= 180-65-70=45
Ans: 45degrees
Answer:
20 units
Step-by-step explanation:
Initial particle concentration = 80 units
Particles removed each hour = 50% of the remaining particles
To find:
Particle concentration after 2 hours = ?
Solution:
Particles removed in 1 hour = 50% of remaining particles
i.e. Particles removed in 1 hour = 50% of initial concentration
Particles removed in 1 hour = 50% of 80 = 40
Particles removed in next 1 hour = 50% of remaining particles
i.e. Particles removed in next 1 hour = 50% of concentration after 1 hour
Particles removed in next 1 hour = 50% of 40 = 20
Total particles concentration removed in 2 hours = 40 + 20 = 60 units
Therefore, particle concentration after 2 hours = Initial concentration - Total particle concentration removed in 2 hours
= 80 - 60 = <em>20 units</em>
Answer:
8% increase
Step-by-step explanation:
The length after the increase:
30 x 1.1 = 33cm
The width after the increase:
20 x 1.05 = 21cm
New perimeter:
2(33 + 21) = 108 cm^2
Old perimeter:
2(30 + 20) = 100 cm^2
Percentage increase of area:
108 / 100 = 1.08 = 8% increase
Answer:
<h2><u>
B. Circle</u></h2>
Step-by-step explanation:
The index of the refraction is 0.898 and the index of the refraction is less than one which is unreasonable because the speed of the light can't be more than c.
<h3>What is refraction?</h3>
The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The difference in density is the cause of the bending.
Refraction is a term that is used to describe the phenomenon of refraction."The change in direction of a wave traveling through one medium to another is known as refraction."
From the Snell's law:
nsinФ = n'sin∅
We have n' = 1.33, ∅ = 10.0°, Ф = 14.9°
nsin110.0° = 1.33×sin14.9°
n = 0.898
Because the speed of light cannot be greater than c, the index of refraction is less than one, which is illogical.
It is illogical to assume that the angle of refraction is excessively large in relation to the angle of incidence.
Thus, the index of the refraction is 0.898 and the index of the refraction is less than one which is unreasonable because the speed of the light can't be more than c.
Learn more about the refraction here:
brainly.com/question/17156275
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