Answer:
The distance of the goggle from the edge is 5.30 m
Explanation:
Given:
The depth of pool (d) = 3.2 m
let 'i' be the angle of incidence
thus,
i = 
i = 67.75°
Now, Using snell's law, we have,
n₁ × sin(i) = n₂ × 2 × sin(r)
where,
r is the angle of refraction
n₁ is the refractive index of medium 1 = 1 for air
n₂ is the refractive index of medium 1 = 1.33 for water
now,
1 × sin 67.75° = 1.33 × sin(r)
or
r = 44.09°
Now,
the distance of googles = 2.2 + d×tan(r) = 2.2 + (3.2 × tan(44.09°) = 5.30 m
Hence, <u>the distance of the goggle from the edge is 5.30 m</u>
Answer:
We must be approximately at least 1.337 meters away to be exposed to an intensity considered to be safe.
Explanation:
Let suppose that intensity is distributed uniformly in a spherical configuration. By dimensional analysis, we get that intensity is defined by:
(1)
Where:
- Intensity, measured in watts per square meter.
- Radius, measured in meters.
If we know that 
and 
, then the radius is:
![r = \sqrt[3]{\frac{3\cdot \dot W}{4\pi\cdot I} }](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%5B3%5D%7B%5Cfrac%7B3%5Ccdot%20%5Cdot%20W%7D%7B4%5Cpi%5Ccdot%20I%7D%20%7D)
![r = \sqrt[3]{\frac{3\cdot (10\,W)}{4\pi\cdot \left(1\,\frac{W}{m^{2}} \right)} }](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%5B3%5D%7B%5Cfrac%7B3%5Ccdot%20%2810%5C%2CW%29%7D%7B4%5Cpi%5Ccdot%20%5Cleft%281%5C%2C%5Cfrac%7BW%7D%7Bm%5E%7B2%7D%7D%20%5Cright%29%7D%20%7D)
We must be approximately at least 1.337 meters away to be exposed to an intensity considered to be safe.
We know, v = d / t
Here, v = 120 miles/hour
t = 3.5 hour
Substitute their values,
120 = d / 3.5
d = 120 * 3.5
d = 420 miles
In short, Your Answer would be 420 miles
Hope this helps!
Answer: When electricity flows through it.
Explanation:
The electromagnet exhibits magnetic properties only as soon as current flows through the nucleus. Namely, the electric current in the space around the electrical conductor through which it passes creates a magnetic field. Unlike a permanent magnet, which has a permanent property of magnetism, the electromagnet is a temporary magnet because the magnetic field also disappears when the current ceases.
