The currents (Amperes)
in the two cases are calculated as power/voltage: <span>
510000W / 12000V = 42.5 A
510000W / 47000V = 10.85 A
<span>And that the power wasted in the two cases is calculated as current^2
x resistance:
(42.5 A)^2 (2.5 Ohms) = 4,515.625 W
(10.85 A)^2 (2.5 Ohms) = 294.30625 W
<span>So the amount of power saved is the difference:
<span>4,515.625 - 294.30625 = 4221.32 Watts</span></span></span></span>
<span>This is the main reason
why distribution grids aim to operate at the highest voltages possible.</span>
#2 - A metal railing rusting in camp weather. Rusting is a chemical change.
Answer: 30s, 900m
Explanation: once the break is applied, the car will decelerate and the car will come to rest.
Since the car is coming to rest, final velocity (v) equals zero.
Hence u = 60 m/s, a = - 2m/s²
Recall that v = u + at
0 = 60 +( - 2)t
2t = 60, t = 60 /2 = 30s.
To get the distance covered before the car comes to rest, we have the formulae below
v² = u² + 2as
0² = 60² + 2(-2)s
0 = 3600 - 4s
4s = 3600
s = 3600/ 4 = 900m
The Noble Gases are the most unreactive b/c its outermost shell completes the energy level and is stable enough.
Elements in the each group have the same number of valence electrons.
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Answer:
given,
volume = 133.7 ft³
1 ft³ = 0.0283 m³
133.7 ft³ = 133.7 × 0.0283 = 3.784 m³
mass = 268 kg
1 kg = 2.204 lb
268 kg = 268 × 2.204 = 590.672 lb
weight of the fuel = 268 × 9.8 = 2626.4 N
1 N = 0.2248 lbf
2626.4 N = 2626.4 × 0.2248 = 590.414 lbf
ρ = 70.82 kg/m³
specific volume =
= 0.226 ft³/lbm