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Anika [276]
3 years ago
6

The black board appears black because:

Physics
1 answer:
marishachu [46]3 years ago
8 0

Answer:

I think its C All visible light wavelengths (ROYGBV) are absorbed by the board

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Help ASAP thanks !!!
Ann [662]

Answer:

true

Explanation:

3 0
3 years ago
How are the spiral arms of the milky way detected?
Step2247 [10]
The spiral structure emerges when galactic clusters (open), H II regions and O & B type stars (young stars) are used as tracers. We know this to be true as other pinwheel galaxies exhibit the same patterns across these tracers as in the milky way.
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3 years ago
An air-filled parallel-plate capacitor has plates of area 2.90 cm2 separated by 2.50 mm. The capacitor is connected to a(n) 18.0
Murrr4er [49]

Complete question:

An air-filled parallel-plate capacitor has plates of area 2.90 cm2 separated by 2.50 mm. The capacitor is connected to a(n) 18.0 V battery. Find the value of its capacitance.

Answer:

The value of its capacitance is 1.027 x 10⁻¹² F

Explanation:

Given;

area of the plate, A = 2.9 cm² = 2.9 x 10⁻⁴ m²

separation distance of the plates, d = 2.5 mm = 2.5 x 10⁻³ m

voltage of the battery, V = 18 V

The value of its capacitance is calculated as;

C = \frac{k\epsilon_0A}{d} \\\\C = \frac{(1)(8.85\times 10^{-12})(2.9 \times 10^{-4})}{2.5 \times 10^{-3}} \\\\C = 1.027 \times 10^{-12} \ F

Therefore, the value of its capacitance is 1.027 x 10⁻¹² F

8 0
3 years ago
If a girl is standing in front of a smooth surface from which a sound is reflected the girl may hear
Harlamova29_29 [7]
If the girl is also near the source of the sound, two alike sets of sounds will be heard.
7 0
3 years ago
Read 2 more answers
How much force is required to accelerate a 50 kg mass at 2 m/s
marta [7]

Answer:

F = 100 Newtons

Explanation:

F = ma

F = (50 kg)(2 m/s)

F = 100 kg*m/s

3 0
3 years ago
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