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Yakvenalex [24]
4 years ago
15

Which solid is the best thermal insulator

Physics
1 answer:
alex41 [277]4 years ago
4 0
Can I please get the choices? I would love to answer this question, but 'I have no choices.
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A group of hikers hear an echo 3.3 s after they shout. The temperature is 20◦C.
romanna [79]

Answer:

560 m

Explanation:

The speed of sound in air is approximately:

v ≈ v₀ + 0.6T

where v₀ is the speed of sound at 0°C (273 K) in m/s, and T is the temperature in Celsius.

The speed of sound at 20°C at that altitude is:

v ≈ 327 + 0.6(20)

v ≈ 339 m/s

The sound travels from the hikers to the mountain and back again, so it travels twice the distance.

339 m/s = 2d / 3.3 s

2d = 1118.7 m

d = 559.35 m

Rounding, the mountain is approximately 560 m away.

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3 years ago
An object is thrown off a cliff with a horizontal speed of 10 m/sec. After 3 seconds the object hits the ground. Find the height
Degger [83]

Answer:

223

Explanation:

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Which statements about Earth’s core help explain Earth’s magnetic field? Check all that apply.
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<span>The inner core is liquid and moving.</span>
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natta225 [31]

Answer:

Different organelles play different roles in the cell — for instance, mitochondria generate energy from food molecules; lysosomes break down and recycle organelles and macromolecules; and the endoplasmic reticulum helps build membranes and transport proteins throughout the cell.

Explanation:

Hopefully this helped!

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