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3 years ago

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.

Physics

2 answers:

Anarel [89]3 years ago

8 0

A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.

Fiesta28 [93]3 years ago

6 0

As the source approaches you, the sound waves are compressed, so
the pitch of the sound is higher than what the source is actually emitting.

Then, after it passes you and begins moving away, the sound waves
are stretched, so the pitch of the sound is lower than what the source
is actually emitting.

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What is the velocity of a rocket that goes 700 km north in 25 seconds?

Svet_ta [14]

Use this formula
Displacement= velocity x time
Velocity=Displacement/time
V=700/25
V=28 km/s

5 0

3 years ago

Thoroughly explain how to balance this chemical equation.

noname [10]

The coefficients are 8 17 1 8

remember that we have to have the same amount of atoms on each side of the equation.
start with C there is 1 on the left and 8 on the right so 8 has to be on the CO. now there is an 8 now on the water there is 1 originally and now we need 8. from water there is now a total of 16 hydrogen plus the 18 from octane for a total of 34. the left has an H2. 34/2 = 17. that is where the 17 comes from

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2 years ago

Which of the following statements are incorrect? a) The state of matter for an object that has a definite volume but not a defin

hoa [83]

Answer:

a), b), d), and e) are correct.

Explanation:

c) is incorrect because an object that has a definite shape cannot be in a gaseous state as gaseous objects take the shape of their container.

a) is correct because objects that are liquid have definite volumes but no definite shapes as they take the shape of their containers,

b) is correct as this is the definition of an object which is in a solid state.

d) is correct as this is the definition of an object which is in a gaseous state.

e) is correct as rigidness, the quality of having a definite shape is only exhibited by objects that are in solid state.

7 0

3 years ago

Carbon-14 has a half-life of 5,730 years. if the age of an object older than 50,000 years cannot be determined by radiocarbon da

Aleonysh [2.5K]

<h3>Answer;</h3>

Carbon-14 levels in a sample are undetectable after approximately 9 half lives

<h3>Explanation;</h3>

The half life of Carbon-14 is 5,730 years . Half life is the time taken by a radioactive material to decay by half of its original mass. Therefore, it would take a time of 5730 years for a sample of 100 g of carbon-14 to decay to 50 grams

A period of 50,000 years, is equivalent to;

 50,000÷5,730 

= 8.73 half lives

Which is approximately equal to 9 half lives.

Therefore, if the age of an object older than 50,000 years cannot be determined by radiocarbon dating, then Carbon-14 levels in a sample are undetectable after approximately 9 half lives.

6 0

2 years ago

Read 2 more answers

How many miles of MgCI2 are there in 339g of compound?

harkovskaia [24]

I'm going to answer this by using rounded numbers for the atomic masses. You need only go back and put the numbers in from your periodic table. My answers will be close, but not what you should get.

Find the Molar Mass of MgCl2

Mg = 24 grams

2Cl = 2 * 35.5 = 71 grams

Total = 95 grams

Find the mols in 339 grams

1 mole = 95 grams

x mol = 339

Solve

339 = 95x Divide by 95

339/95 = x

x = 3.67 mols Answer

4 0

2 years ago