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miss Akunina [59]
2 years ago
15

What is the wavelength of an AM radio wave in a vacuum if its frequency is 810 kHz?

Physics
1 answer:
dalvyx [7]2 years ago
6 0
Answer- 370.114 meters
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A bungee jumper of mass m = 65 kg jumps from a bridge.
yawa3891 [41]

To solve the problem it is necessary to apply energy conservation.

By definition we know that kinetic energy is equal to potential energy, therefore

PE = KE

mgh = \frac{1}{2}mv^2

Where,

m = mass

g = gravitaty constat

v = velocity

h = height

Re-arrange to find h,

h=\frac{v^2}{2g}

Replacing with our values

h=\frac{26^2}{2*9.8}

h = 34.498\approx 34.5m

Therefore the correct answer is C.

3 0
2 years ago
A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has area 0.500 m2 . At
Anastaziya [24]

Answer:

31.8 × 10⁻⁴ J = 3.18 mJ

Explanation:

We know the intensity I of a wave is I = P/A where P = power and A = area = 0.500 m²

The intensity of an electromagnetic wave is also equal to I = E₀²/μ₀c

where E₀ = maximum electric field strength = √2E where E = rms value of electric field = 0.0200 N/C, μ₀ = 4π × 10⁻⁷ H/m ,c = 3 × 10⁸ m/s

P/A = E₀²/μ₀c = 2E²/μ₀c

P = 2E²A/μ₀c = 2 × (0.02 N/C)² × 0.5 m²/(4π × 10⁻⁷ H/m × 3 × 10⁸ m/s)

  = 1.06 × 10⁻⁴ W = 0.106 mW

Since P = E/t where E = Energy and t = time

E = Pt with t = 30 s

E = 1.06 × 10⁻⁴ W × 30 s =  31.8 × 10⁻⁴ J = 3.18 mJ

So the wave carries 3.18 mJ of energy through the window in 30 s

5 0
3 years ago
A Ferris wheel with a diameter of 35 m starts from rest and achieves its maximum operational tangential speed of 2.3 m/s in a ti
Butoxors [25]

Answer: 8.8e-3 rad/s², 0.0 m/s²

Explanation:

R = 35 / 2 = 17.5 m

a = 2.3 m/s / 15 s = 0.1533333... m/s²

α = a/R = 0.1533333/17.5 = 0.0087619... ≈ 8.8e-3 rad/s² ◄(a)

at maximum speed, no more acceleration in either tangential or angular

α = a = 0.0 rad/s² or m/s² ◄(b)

5 0
2 years ago
What is the relationship between frequency and wavelenghts of an EM wave?
Virty [35]

Answer:

<h2><em><u>a.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>as </u></em><em><u>wavelengths </u></em><em><u>decreases </u></em><em><u>,</u></em><em><u>the </u></em><em><u>frequency </u></em><em><u>of </u></em><em><u>the </u></em><em><u>waves </u></em><em><u>increases.</u></em><em><u /></em></h2>
4 0
3 years ago
Read 2 more answers
Which of the following require friction?
Bess [88]

Explanation:

Option D all of the above

if this helps you then please make me brainlist

7 0
2 years ago
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