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Lynna [10]
3 years ago
7

When Lisa placed a balloon to her ear, she was able to hear what her sister was whispering from the other side of the room. When

she removed the balloon, she was no longer able to hear what her sister was saying. What is the best explanation for what Lisa discovered?
A) The material from which the balloon is made makes sounds seem louder.
B) There is no air pressure inside the balloon, which makes sound waves travel more quickly.
C) The air in the balloon is not as dense as the air outside the balloon, which makes sound waves echo.
D) Sound does not travel around the air outside of the balloon as well as it does through the denser air pressure inside the balloon.
Physics
2 answers:
Juli2301 [7.4K]3 years ago
4 0

D

Sound travels best in dense air because the molecules are close together than in less dense air.

Explanation:

Because the air is compressed in the balloon, the air molecules inside are closer together than the air molecules outside the balloon. Therefore these molecules inside the balloon can transmit the sound energy effectively. Remember sound waves are made by the transmission of the compression and rarefaction by the air molecules.

This is also the reason why solids are good transmitters of sound waves (and other mechanical waves) than air. The molecules of solids are more closely packed than those of air.

Learn More:

For more on sound transmission check out;

brainly.com/question/13883327

brainly.com/question/2234779

brainly.com/question/61859

#LearnWithBrainly

galben [10]3 years ago
3 0

Correct answer is D

Sound does not travel around the air outside of the balloon as well as it does through the denser air pressure inside the balloon. Sound waves travel better through denser material.

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Consider the accuracy of recording muscle electrical activity using electrodes placed on the skin surface, compared to directly
OverLord2011 [107]

Answer: The common difference between surface EMG and intramuscular EMG is that that former is non-invasive while the later is an invasive method

Explanation:

Electromyography (EMG) is used clinically for the examination of muscle excitations (muscle electrical activity) in both normal or abnormal conditions. There are two forms of EMG includes:

--> Surface EMT and

--> Intramuscular EMT

Surface EMT is a non invasive method of examination of muscle excitations for superficial and easily accessible muscles.

Intramuscular EMT is the invasive method of examination of muscle excitations usually for deep muscles.

The difference between the two forms of EMT includes:

- surface EMT is non- invasive while intramuscular EMT is invasive

- surface EMT is used to access superficial muscle while intramuscular EMT is used to access deep muscles.

- surface EMT requires less skill and time to carry out while intramuscular EMT requires special skills and takes more time while carrying out the procedure.

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3 years ago
If we heated the ball up and kept the ring room temperature, would the ball be able to fit through the ring? (1 point) Why or wh
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Answer:

no:

Explanation:

it would grow and no longer be able to fit through the loop due to the hot air expanding.

8 0
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What should be angle between force and displacement to get the maximum work​
aleksandrvk [35]

Answer: The angle between force and displacement should be θ = 90° for minimum work. The angle between force and displacement should be θ = 0° for maximum work.

7 0
3 years ago
At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety de
e-lub [12.9K]

Assume a maximum stopping acceleration of g/2 where g is acceleration due to gravity.

Answer:

2.99 m/s

Explanation:

Stopping distance, s = 3 ft = 0.914 m

final velocity, v = 0

a = g/2 = 4.9 m/s²

Use third equation of motion:

v^2-u^2 = 2as

substitute the values to find the speed of train:

0 -u^2 = 2\times -4.9 \times 0.914 \\u^2=8.96 \\u=2.99 m/s

6 0
3 years ago
A 2.31 kg rope is stretched between supports 10.4 m apart. If one end of the rope is tweaked, how long will it take for the resu
zlopas [31]

Answer:

t = 0.657 s

Explanation:

First, let's use the appropiate equations to solve this:

V = √T/u

This expression gives us a relation between speed of a disturbance and the properties of the material, in this case, the rope.

Where:

V: Speed of the disturbance

T: Tension of the rope

u: linear density of the rope.

The density of the rope can be calculated using the following expression:

u = M/L

Where:

M: mass of the rope

L: Length of the rope.

We already have the mass and length, which is the distance of the rope with the supports. Replacing the data we have:

u = 2.31 / 10.4 = 0.222 kg/m

Now, replacing in the first equation:

V = √55.7/0.222 = √250.9

V = 15.84 m/s

Finally the time can be calculated with the following expression:

V = L/t ----> t = L/V

Replacing:

t = 10.4 / 15.84

t = 0.657 s

4 0
3 years ago
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