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3 years ago

What best describes a sonar wave

1 answer:

8 0

Sonar<span> (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.</span>

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Calculate the average value of an AC signal with a peak amplitude of 10V and a frequency of 10 kHz.

Solnce55 [7]

Answer:

V(average)=6.37 V

Explanation:

Given Data

Peak Voltage=10V

Frequency=10 kHZ

To Find

Average Voltage

Solution

For this first we need to find Voltage peak to peak

Voltage (peak to peak)= 2× voltage peak

Voltage (peak to peak)= 2×10

Voltage (peak to peak)= 20 V

Now from Voltage (peak to peak) formula we can find the Average Voltage

Voltage (peak to peak)=π×V(average)

V(average)=Voltage (peak to peak)/π

V(average)=20/3.14

V(average)=6.37 V

3 0

3 years ago

Stand on a bathroom scale and read your weight. When you lift one foot up so you’re standing on one foot, does the reading chang

lina2011 [118]

Answer: yes the reading changes,

And a scale reads pressure not force

Explanation:

3 0

3 years ago

A 70.0 kg base runner moving at a speed of 4.0 m/s begins his slide into second base. The coefficient of friction between his cl

Andre45 [30]

Answer:

B. 560 J

J. 1.2 m

Explanation:

v = Final velocity = 0

u = Initial velocity = 4 m/s

$\mu$ = Coefficient of friction = 0.7

m = Mass of runner = 70 kg

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

Kinetic energy is given by

$K=\dfrac{1}{2}m(v^2-u^2)\\\Rightarrow K=\dfrac{1}{2}\times 70\times (0^2-4^2)\\\Rightarrow K=-560\ \text{J}$

The mechanical energy lost is 560 J

Acceleration is given by

$a=-\mu g\\\Rightarrow a=-0.7\times 9.81\\\Rightarrow a=-6.867\ \text{m/s}^2$

From kinematic equations we get

$v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-4^2}{2\times -6.867}\\\Rightarrow s=1.165\approx 1.2\ \text{m}$

The runner slides for 1.2 m

4 0

3 years ago

Why do scientists use the scientific method when completing experiments.

polet [3.4K]

Answer:

Scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis.

Explanation:

8 0

3 years ago

A 1056-hertz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the freque

boyakko [2]

Answer:

Explanation:

There is not enough information in the question. A beat is the observed differences between two frequencies.

Hence, 3 beat represents a difference of 3-hertz between the two frequencies. So the frequency of the piano string could be 1056+3 = 1059-hertz or 1056-3= 1053-hertz.

In order to ascertain the actual value i.e if it is an increase or a decrease in frequency observed, we need more information.

4 0

3 years ago