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Brut [27]
3 years ago
14

NEED HELP QUICK! BRAINLIST TO FASTEST!

Physics
2 answers:
Illusion [34]3 years ago
5 0
Fred imagine the arrows are straight lines and see which one is longer.
Reptile [31]3 years ago
3 0
Fred because the girl takes a shortcut
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Consider a standing wave in a one dimensional ideal medium of length "D" (like a vibrating string).
stira [4]

Answer:

a) 20 nodes    b) zero nodes

Explanation:

When we have standing waves in a bend we have nodes at the ends and the equation describes the number of possible waves in the string is

         L = n λ/2

Where λ is the wavelength, L is the length of the string, in our case it would be D and n is an entered. We can strip the wavelength of this expression

       

       λ = 2L / n

Let's calculate what value of n we have for a wavelength equal to D/10

       λ = 2D / n

       λ = D / 10

We match and calculate

       2D / n = D / 10

       2 / n = 1/10

       n = 20

Perform them for  λ = D / 20

       λ = 2D / n

       2D / n = D / 20

       n = 2 20 = 40

Since n is an inter there should be a wavelength for each value of n in the bone period there should be 20 different wavelengths

B) for La = 10D

       2D / n = 10D

       1 / n = 5

       n = 1/5 = 0.2

 

La = 20D

       2D / n = 20D

       1 / n = 10

      n = 1/10 = 0.1

These numbers are not entered so there can be no wave in this period

5 0
3 years ago
g a 240 V<0 source source supplies a balance, three-phase load in a delta configuration. The line current is 3 A<45. What
amid [387]
Schoolegfnfabgsag hvbhgddscgh
8 0
3 years ago
There are two types of waves, mechanical and electromagnetic. Microwaves, infrared, and radio was are examples of electromagneti
aivan3 [116]

Answer:

The answer is D.

Explanation:

One explanation I can give you is that generally waves travel faster through denser medium because the particles are tightly packed together and so they can transfer energy faster. But to verify the answer, I used Process of Elimination because the other 3 answers are not true. Choice A is entirely true, wave speed depends on the medium it is travelling through, so there is no way choice A is correct. Choice B is wrong because for example if we take light(an EM wave), it travels at a constant speed of 3.0x10^8 m/s in a vacuum and in open space. So, that proves that air or vacuum do not affect the speed of the wave in another medium. Choice C is related to Choice B, we just proved the speed of light is constant everywhere whereas choice C says that in a vacuum the speed is halved. Good luck in your Physics class and I hope for your best!

5 0
3 years ago
The speed of a car is 40m/s after 10 sec suddenly there was a crowd and the driver reduces its speed to 20m/s. What is the decel
aliya0001 [1]

Explanation:

the number 0.4 in P4 from east

4 0
3 years ago
What is the term for heat transfer because of the movement of electromagnetic waves?​
olchik [2.2K]
It is radiation that transfers heat energy through space by electro radiation.
4 0
4 years ago
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