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2 years ago

Plz quick I'll give brainlest ....Which one of the following is wrong statement?

2 answers:

7 0

OPTION B) THE SPEED OF SOUND IN STONE IS SLOWER THAN IN WOOL -- FALSE

Explanation:

A) YES ALL MATERIALS CAN TRANSMIT SOUND.

C) YES SOUND CANNOT MOVE IN VACUUM.

D) YES SOUND LOSES ITS ENERGY AS IT TRAVELS.

THIS THREE OPTION ARE TRUE. BUT OPTION B) IS WRONG.

HOPE IT HELP.....❤❤❤

scoundrel [369]2 years ago

6 0

Answer:

B. The speed of sound in stone is slower than in wool.

Explanation:

A. All materials can transmit sound. True

Solids, liquids and gases can transmit sound even though the degree of transmission varies.

C. Sounds cannot move in vacuum. True

Sound cannot transmit in space. You can prove it using the "bell jar" experiment.

D. Sound loses its energy as it travels. True

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A teacher performing demonstration finds that a piece of cork displaces 23.5 ml of water. The piece of cork has a mass 5.7 g. Wh

Sedbober [7]

Answer: 0.24g/ml

Explanation:

Given that:

Volume of water displaced = 23.5 ml

Mass of cork = 5.7 g

Density of the cork = ?

Recall that density is obtained by dividing the mass of a substance by the volume of water displaced.

i.e Density = Mass/volume

Density = 5.7g /23.5ml

Density = 0.24g/ml

Thus, the density of the piece of cork is 0.24g/ml

8 0

3 years ago

A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg · m 2 is rotating freely with an angular speed of 1

lidiya [134]

Answer:

angular speed = 0.4 rad/s

Explanation:

given data

radius = 5 m

moment of inertia = 2000 kg-m²

angular speed = 1.0 rad/s

mass = 60 kg

to find out

angular speed

solution

Rotational momentum of merry-go-round = I?

we get here momentum that is express as

momentum = 2000 × 1

momentum = 2000 kg-m²/s

and

Inertia of people will be here as

Inertia of people = mr² = 60 × 5²

Inertia of people = 1500 kg-m²

so Inertia of people for two people

1500 × 2 = 3000

and

now conserving angular momentum(ω)

moment of inertia × angular speed = ( momentum + Inertia of people ) angular momentum

2000 × 1 = (2000 + 3000 ) ω

solve we get now

ω = 0.4 rad/s

5 0

2 years ago

What is the velocity in meters per second of a runner who runs exactly 110 m toward the beah in 72 seconds?

rjkz [21]

B) 1.53 m/s towards the beach

8 0

3 years ago

Read 2 more answers

Look around the room you are in. Name

kozerog [31]

Answer:

A wire,rubber

Explanation:

yes

3 0

2 years ago

Read 2 more answers

the half-life of carbon-14 is 5,730 years. After 11,460 year, how much of original carbon-14 remains?

Inessa [10]

Via the half-life equation:

$A_{final}=A_{initial}(\frac{1}{2})^{\frac{t}{h}}$

Where the time elapse is 11,460 year and the half-life is 5,730 years.

$A_{final}=A_{initial}(\frac{1}{2})^\frac{11460}{5730} \\\\A_{final}=A_{initial}\frac{1}{4} \\\\A_{final}=\frac{1}{4}A_{initial}$

Therefore after 11,460 years the amount of carbon-14 is one fourth (1/4) of the original amount.

6 0

2 years ago