On e2020 the answers are:
1. There is no rainbow-like halo around the image.
2. Reflecting telescopes can be made very large.
4. Only the reflecting side of the primary mirror needs to be perfectly shaped and smooth.
I hope that helps!!
Answer:
<em>The resonance frequency = 0.978 Hz</em>
Explanation:
Resonance: This is a point in an A.c circuit where the capacitive reactance is equal to the inductive reactance. The frequency at resonance is called<em> Resonance Frequency. Mathematically, </em><em>resonance frequency is expressed as</em>
f₀ = 1/2π√(LC)......................................... Equation 1
Where f₀ = resonance frequency, L = inductance of the inductor, C = capacitance
<em>Given: L = 900 mH = (900/1000) H = 0.9 H, C = 0.014 mF = (0.014/1000) F = 0.000014 F</em>
<em>Constant: π = 3.143</em>
Substituting these values into equation 1
f₀ = 1/2×3.143√(0.9×0.000014)
f₀ = 1/6.286√(0.0000126)
f₀ = 1/6.286×0.00355
f₀ = 1/0.0223
f₀ = 0.978 Hz.
<em>Therefore the resonance frequency = 0.978 Hz</em>
Answer:
8.02×10⁵ m
Explanation:
Equation for centripetal force:
F = mv²/r
Solving for r:
r = mv²/F
Given:
F = 8955 N
m = 1160 kg
v = 7446 m/s
r = (1160 kg) (7446 m/s)² / 8955 N
r = 7.182×10⁶ m
The height above the surface is:
h = 7.182×10⁶ m − 6.38×10⁶ m
h = 0.802×10⁶ m
h = 8.02×10⁵ m
According to the laws of reflection,
the angle of incidence = the angle of reflection
Thus, angle 2 = angle 3
Answer:
A. oceanic crust
Explanation:
I remember that the ocean is said to cover 71% of the Earth's surface. If you look at a globe, notice that most all the surface is <em>blue</em> like the ocean.
One other note: the surface is the Earth's outermost layer. Think of it this way: <em>surface</em> implies the <em>top</em> of something, something exposed to the outside.
Therefore, the answer is A. Hope this helps you understand the question more! Have a great day, 'kay?
