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3 years ago

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

2 answers:

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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]3 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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Which career is most concerned with the study of radioactive isotopes?

leonid [27]

The career that is most concerned with the study of radioactive isotopes is chemistry. You need to have passed AP chemistry to actually deal with the isotopes. In a quick reference, isotopes are when the atom has difference amount of neutrons, making the atomic mass differ.

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3 years ago

Calculate the average velocity of a motor cycle that travels 72km/hr in 20 seconds

olchik [2.2K]

Velocity =displacement
Change in time
D=72km/hr
Time=20s
But the S.I unit of velocity is m/s so you woul have to change 72km/hr to m/s

Changing 72km to m

1 kilometer=1000meters
Then, 72 kilometers =?

72•1000/1
=72000m

Changing 72hours to seconds

If 1 hour = 3600 seconds
Then 72 hours=?

72•3600/1

=259200 seconds

Velocity =displacement
Change in time

V= 72,000
259,2005
=0.028m/s

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3 years ago

State one use and one disadvantage of the expansion of materials when they are heated.

Reil [10]

An example of the use of expansion of materials when they are heated is in

Thermometers. Thermometer is an instrument which is used to measure the

temperature of a place.

It contains mercury which expands as temperature increases. This is used

to accurately determine the temperature of an object.

The disadvantage of expansion of materials when they are heated can be

seen in roads as there is expansion of the surface as a result of heat

exposure leads to roads being rough thereby incurring more costs for

repairs.

Read more about Heat expansion on brainly.com/question/1166774

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2 years ago

A skateboarder is standing at the top of a tall ramp waiting to begin a trip. The skateboarder has

Mnenie [13.5K]

Has a skateboard. your gonna have to give more details the. that just one .

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3 years ago

The maximum distance at which a highway sign can be read is determined for a sample of young people and a sample of older people

liubo4ka [24]

Answer:

The population mean are the same

Explanation:

Answer:

The population means are the same.

Explanation:

The hypotheses for a difference in two population means are similar to those for a difference difference two population proportions.

At null point, Ha=0

Let the mean population of the young one be u1

Let the mean population of the old one be u2.

Then, the difference between their mean population distance is given as

Ha=u2-u1

Since, Ha is null point, Ha=0

0=u2-u1

u2=u1

This shows that the mean population distance of the old is equal to the mean population distance of the young.

Therefore their mean population distance is the same

Since it is null alternative then, the population mean are the same.

We must sample the population using

1. Samples must be random to remove or minimize bias.

2. Sample must be representative of the populations in question.

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3 years ago