Answer:
hi zzayn i will solve this later
Explanation:
Let's establish that x= number of polio vaccinations and y=number of measles vaccinations.
Since Dr. P gave a total of 60 VACCINATIONS, we know that x+y=60. (This is equation #1)
We also know that Dr. P gave a total of 184 DOSES of the vaccinations and that the polio vaccine has 4 doses, while the measles vaccine has 2 doses. This means that our second equation is 4x+2y=184. (This is equation #2)
You can get either variable (x or y) by itself from equation #1. I always choose x.
x+y=60
-y. -y
x=60-y
Now we can plug our x value into equation #2.
4x+2y=184
4(60-y)+2y=184
240-4y+2y=184
240-2y=184
-240 -240
-2y=-56
/-2 /-2
y=28 measles vaccines
So we know that Dr. P administered 28 measles vaccines. We need to plug our y value back into equation #1 (or, to make it easier, our switched around equation) to find the number of polio vaccines.
x=60-y
x=60-28
x=32 polio vaccines
Interesting question. I'd take a guess that it could be either mirrors and light travelling in straight lines and being reflected, or optical fibres to achieve a perhaps similar result.
Answer:
R (120) = 940Ω
Explanation:
The variation in resistance with temperature is linear in metals
ΔR (T) = R₀ α ΔT
where α is the coefficient of variation of resistance with temperature, in this case α = -0,0005 / ºC
let's calculate
ΔR = 1000 (-0,0005) (120-0)
ΔR = -60
Ω
ΔR = R (120) + R (0) = -60
R (120) = -60 + R (0)
R (120) = -60 + 1000
R (120) = 940Ω
The acceleration due to gravity serves as the centripetal acceleration of the objects that orbits the Earth. The centripetal acceleration due to gravity is calculated through the equation,
a = v²/r
where v is the speed and r is the radius. Substituting the known values to the equation,
9.8 m/s² = (420 m/s)² / r
The value of r from the equation is 18000 m or equal to 18 km.
<em>Answer: 18 km</em>
