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topjm [15]
3 years ago
15

Sound is repeated near hills.​why

Physics
1 answer:
Anon25 [30]3 years ago
5 0

Answer:

Sound waves are reflected back

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Why does a lunar eclipse last for a few hours whereas a solar eclipse only lasts for a few minutes?
Aneli [31]

Answer:

The type and length of a lunar eclipse depend on the Moon's proximity to either node of its orbit. ... A total lunar eclipse can last up to nearly 2 hours, while a total solar eclipse lasts only up to a few minutes at any given place, due to the smaller size of the Moon's shadow.

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What is the gravitational force between two identical 5000 kg asteroids whose centers of mass are separated by 100 m?
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Two wheel gears are connected by a chain. The larger gear has a radius of 8 centimeters and the smaller gear has a radius of 3 c
dezoksy [38]

Answer:

B.The linear velocity of the gears is the same. The linear velocity is 432π centimeters per minute.

Explanation:

As we know that the small gear completes 24 revolutions in 20 seconds

so the angular speed of the smaller gear is given as

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\omega = 2.4\pi rad/s

Now we know that the tangential speed of the chain is given as

v = r \omega

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v = 7.2 \pi cm/s

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Since both gears are connected by same chain so both have same linear speed and hence correct answer will be

B.The linear velocity of the gears is the same. The linear velocity is 432π centimeters per minute.

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3 years ago
What is the relationship between kinetic energy and changing states of matter?
oee [108]

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2 years ago
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Is (kr) an element a compound or a mixture?
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3 years ago
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