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3 years ago

Is the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound.

2 answers:

6 0

The loudness of a sound is related to the amplitude of the waves measured. amplitude is the height of the waves. since energy is proportional to amplitude which means energy increases when the amplitude of the waves are increased, then the amount of energy is related to the loudness of the sound.

aleksandrvk [35]3 years ago

5 0

I'm kinda late on telling you the answer but the answer is Intensity. I know it is correct because I had the same question.

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Would it be easier to pull the tablecloth out from under a glass of water or an

Aleksandr-060686 [28]

Glass as it is heavier and by newtons first law and inertia the greater the mass = more inertia(resistance to chabge in motion) thus the glass has a greater mass than an empty paper cup and thus has greater inertia. So it would be easier to leave it in place

3 0

3 years ago

A frictionless piston–cylinder device contains 5 kg of nitrogen at 100 kPa and 250 K. Nitrogen is now compressed slowly accordin

Arte-miy333 [17]

Answer:

The work input during this process is -742 kJ

Explanation:

Given;

Initial temperature of nitrogen T₁ = 250 K

final temperature of nitrogen T₂ = 450 K

mass of nitrogen, m = 5 kg

$PV^{1.4} = constant$

The work input during the process is calculated as;

$W = \frac{m*R(T_2-T_1)}{1-n}$

where;

R is gas constant = 0.2968 kJ/kgK

substitute given values in above equation.

$W = \frac{m*R(T_2-T_1)}{1-n} = \frac{5*0.2968(450-250)}{1-1.4} = -742 \ kJ$

Therefore, the work input during this process is -742 kJ

8 0

4 years ago

A 20-car train standing on the siding is started in motion by the train’s engine. 2 cm slack is between each of the cars, which

My name is Ann [436]

Answer:

1.81 s

Explanation:

From the given information:

The links between the cars are:

1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 7-8, 8-9, 9-10, 10-11, 11-12, 12-13, 13-14, 14-15, 15-16, 16-17, 17-18, 18-19, 19-20.

where;

1 denotes the first car that joins strongly attached to the engine.

There are 19 links from the above connections and each one of them has a 2 cm slack.

Thus; the total slack = 2 × 19 = 38 cm

However, the speed of the train = 21 cm/s

Then, the time taken by the pulse to travel the length of the train is expressed by using the formula:

= length / speed

= 38 / 21

= 1.81 seconds

Thus, the required time = 1.81 s

6 0

3 years ago

At what angle work done is equal to zero

ira [324]

Answer:

work done=0 when angel between 2 objects is 90 degree

5 0

3 years ago

Caroline, a piano tuner, suspects that a piano's B4 key is out of tune. Normally, she would play the key along with her B4 tunin

Sergeeva-Olga [200]

Answer:

455.9 Hz, Flat

Explanation:

The beat frequency is basically the difference between the frequency of the B4 note and the frequency of the A4 tuning fork. This means the B4 note is 15.9 Hz off of 440Hz, and 67.4 Hz off of 525.3 Hz. As B4 is between the two notes, it would make sense to find its frequency by adding 15.9 to 440 and subtracting 67.4 from 523.3, both if which give us a frequency 455.9 Hz for the B4 key. This is because the note doesn't change for the different turning forks so both differences should result in the same frequency. Because the note should be 493.9 frequency but instead has a frequency of 455.9 Hz, it is flat because the frequency is lower than it is supposed to be.

Hope this helped!

7 0

4 years ago