Answer:
b = 2.22 cm
Explanation:
The laser hits a point where the origin of the coordinate system is to carry out the measurements. When the ray enters the glass the angle of refraction is given by the equation
n₁ sin θ₁ = n₂ sin θ₂
where n₁ is the index of refraction of air n₁ = 1 and n₂ is the index of refraction of glass n₂ = 1.6
sin θ₂ = n₁ /n₂ sin θ₁
sin θ₂ = 1 / 1.6 sin 36
sin θ₂ = 0.367
θ₂ = sin⁻¹ 0.367
θ₂ = 21.6º
with this angle and trigonometry we can find the distance x that the ray advances before reaching the bottom of the glass plate
tan 21.6 = x / d
where d is the thickness of the glass d = 2.8 cm
x = d tan 21.6
x = 2.8 tan 21.6
x = 1.11 cm
as in the second surface it has a process of reflection the angle of reflection is equal to the angle of incidence θ_reflected = 21.6º, therefore to return to the upper surface recreate the same distance, therefore the total distance is
b = 2x
b = 2 1.11
b = 2.22 cm
Answer:
643N.m
Explanation:
From this question we have:
Mass flow = 4kg/s
Velocity V = 400m/s
Rotation N = 1500rev/min
We get the relative velocity at exit to be:
V2 = V - r2w
400-0.5x [(2*π*1500)/60]
= 400-78.5
= 321.5m/s
Then we have to calculate the frictional torque My
Mt = Mr2 x V2
= 4x0.5x321.5
= 643Nm
From the calculations above, we get the frictional torque M on the tube to be 643Nm.
Answer:
B. it increases
Explanation:
As shown in the table provided, the speed of sound in water (1493 m/s) is greater than the speed of sound in air (346 m/s).
Answer:
In any specified solar cycle, the highest number of sunspots is referred to as "solar maximum." The lowest number is referred as "solar minimum."
Explanation:
Around every 11 years, the sun passes through a solar cycle. The cycle is defined by increasing and decreasing sunspots— noticeable on a sun's surface as dark imperfections, or photosphere.
In any specified solar cycle, the highest number of sunspots is referred to as "solar maximum." The lowest number is referred as "solar minimum." The latest solar minimum was obtained in 2008
Answer:
D float.
Explanation:
Here, neutrally buoyant in fresh water
Now,
since the specific gravity of salt water is higher than the specific gravity of the fresh water therefore, the salt water will apply more buoyant force on the object.
And as the object is neutral in fresh water, more buoyant force will make the object float in the salt water.
