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3 years ago

14

Which method can be used for separating a mixture of sand and salt?

2 answers:

Veronika [31]3 years ago

6 0

Answers A and C can be automatically eliminated because evaporation has to do with the water cycle and magnetism has to do with electric current and such. Next we can eliminate B or distillation because it also has to do with water/liquids. Therefore, the answer is D or filtration because it is the only answer left.

I hope this helps!

Alinara [238K]3 years ago

3 0

The anwser is D filtration i just took the test

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A pipe open at both ends has a fundamental frequency of 220 Hz when the temperature is 0°C. (a) What is the length of the pipe?

Allushta [10]

Explanation:

It is given that,

Fundamental frequency, f = 220 Hz

(a) We know that at 0 degrees, the speed of sound in air is 331 m/s.

For open pipe, $\lambda=2l$

l is the length of pipe

Also,

$v=f\lambda$

$l=\dfrac{v}{2f}=\dfrac{331}{2\times 220}=0.75\ m$

(b) Let f' is the fundamental frequency of the pipe at 30 degrees and v' is its speed.

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$v'=331\sqrt{1+\dfrac{30}{273}}$

v' = 348.71 m/s

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Read 2 more answers

A force of 7.50N is applied to a spring whose spring constant is 0.289 N/cm. Find its change in length.

kotykmax [81]

Hook's law states that

$F=k\Delta x$

where F is the applied force, k is the spring constant, and $\Delta x$ is the change in length.

Plugging your values, we have

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3 years ago