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Ne4ueva [31]
3 years ago
13

What are the three longest wavelengths for standing waves on a 280-cm-long string that is fixed at both ends? enter your answers

numerically separated by commas?
Physics
1 answer:
My name is Ann [436]3 years ago
5 0
Three longest wavelengths will correspond to the three modes of vibration that has the least amount of nodes.  For a standing wave on a string fixed on both ends we have the following formula:
\lambda_n=\frac{2L}{n}; n=1,2,3,4,5,...
Where L is the length of a string and n is the number of nodes of the standing wave.
From this formula, we see that the more nodes you have the lower your wavelength is.
We need to calculate wavelengths for n=1, n=2, and n=3.
\lambda_1=\frac{2L}{1}=560$cm\\ \lambda_2=\frac{2L}{2}=280$cm\\ \lambda_3=\frac{2L}{3}=186.67$cm\\
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If a gas has a gage pressure of 156 kPa, it is absolute pressure is approximately
Art [367]
In the given question, one important information for getting to the actual solution is not given and that is the atmospheric pressure. To find the approximate absolute pressure, it is needed to add the value of atmospheric pressure with the gage pressure.
Atmospheric pressure = 100 kPa
Then
Absolute pressure = 156 + 100 kPa
                             = 256 KPa.
5 0
4 years ago
A beam of unpolarized light in air strikes a flat piece of glass at an angle of incidence of 54.2 degrees. If the reflected beam
Stels [109]

Answer:

correct option is B. 1.39

Explanation:

given data

angle of incidence (θ) = 54.2 degrees

to find out

index of refraction of the glass

solution

we know that here reflected beam is completely polarized

so angle of incidence = angle of polarized    ....................1

for reflective index we apply here Brewster law that is

μ = tan(θ)     ...............2

put here θ value we get

μ = tan(54.2)

μ = 1.386

so correct option is B. 1.39

6 0
3 years ago
Read 2 more answers
7. You are floating motionless on a rubber raft in thelmiddle of a pool. A friend forms a wave by slapping the water
german

Answer:

Yes if it continues in that direction.

Explanation:

3 0
4 years ago
5. A student travels 11 m north and then turns around to travel 25 m south. If the total time of travel is 12 sec., find a) The
11111nata11111 [884]

Explanation:

Given that,

A student travels 11 m north and then turns around to travel 25 m south.

Total time, t = 12 s

The total distance or the total path covered by the student is equal to 11 m + 25 m = 36 m

Displacement of the student or the shortest path covered is d = 25-11 = 14 m

(a) The student's average speed = total distance/total time

s=\dfrac{36\ m}{12\ s}\\\\s=3\ m/s

(b) The student's average velocity = total displacement/total time

v=\dfrac{14\ m}{12\ s}\\\\v=1.17\ m/s

4 0
3 years ago
(NEED HELP BADLY)
spin [16.1K]

Answer:

The answer to your question is below

Explanation:

Data 1

mass 1 = 250

mass 2 = 250 kg

gravity constant = 6.67 x 10⁻¹¹ Nm²/kg²

distance = 8 m

Formula

F = G\frac{m1m2}{r^{2} }

Substitution

F = 6.67 x 10^{-11} \frac{250 x 250}{8^{2} }

Result

F = 0.000000065 N

Data 2

mass 1 = 1000 kg

mass 2 = 1000 kg

distance = 5 m

Substitution

F = 6.67 x 10^{-11} \frac{1000 x 1000 }{5^{2} }

Result

F = 0.000002667 N      

8 0
4 years ago
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