Answer:
option A
Explanation:
given,
lamp position from pool wall = 2.5 m
height of the pool = 2.5 m
now,
from the triangle
θ = i = 45°
using Snell's law
n₁ sin i = n₂ sin r
n₁ =4/3 n₂ = 1
now,
r = sin⁻¹(0.9428)
r = 70.5°
hence, the correct answer is option A
Answer : The volume of water in the pool is, 2473 ft³
Explanation :
First we have to calculate the average depth.
Given:
Diameter = 30 ft
Depth range : 1 to 6 ft linearly
average depth =
Now we have to calculate the volume of water in the pool.
Volume = area × average depth
V = π × (radius)² × 3.5
V = π × (30/2)² × 3.5
V = π × (15)² × 3.5
V = π × 225 × 3.5
V = 3.14 × 225 × 3.5
V = 2472.75 ft³ ≈ 2473 ft³
Therefore, the volume of water in the pool is, 2473 ft³
Scientist judge each others work based mostly on how creative it is.
Before 7 after 9. A pH smaller than 7 indicates acidity with 0 being completely acidic. A pH greater than 7 shows alkalinity with 14 being completely alkaline. 7 is neutral. Since NaOH is alkaline, adding it to a neutral substance would increase the pH and it would increase from 7 to 9.
The total charge passing a given point in the conductor from t = 0 to t = 1/240 s is 12000π Coulombs
<h3>Total charge through a conductor</h3>
A conductor is a substance that allow current and electricity to pass through it.
The expression that will be used to calculate the current is expressed s:
I(t) = 100 sin (120πt)
where
I is in amperes and t is in seconds.
Since dQ = Idt = I(t) = 100 sin (120πt)
On integrating
Q = 100*120πcos(120πt) |¹/¹²⁴⁰₀
Substitute the limits
Q = 100 * 120π
Q = 12000π Coulombs
Hence the total charge passing a given point in the conductor from t = 0 to t = 1/240 s is 12000π Coulombs
Learn more on total charge through a conductor here: brainly.com/question/15083960
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