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Vitek1552 [10]
3 years ago
10

A frequency generator (a device that produces sinusoidal signals whose frequency and amplitude can be independently set) is used

to power a horn. The frequency is set to 2000 Hz, and for a particular amplitude the sound intensity is measured to be 0.030 W/m2 at a distance of 14 m. What is the power output of the horn in this case?
Physics
1 answer:
myrzilka [38]3 years ago
8 0

Answer:

73.9 W

Explanation

The sound intensity, I of the horn is given by I = P/A where P = Power output and A = area. Since this is a spherical wave, A = 4πr² where r = distance = 14 m. I = 0.030 W/m². So the power output, P = IA = 0.030 × 4π × 14² = 73.89 W ≅ 73.9 W

You might be interested in
How big is the planet earth​
AnnZ [28]

After doing some research on Wiki, Google, and Easyscienceforkids, I have come to a conclusion that:

Mass: 5.972 * 10^24 kg

Radius: 3958.8 mi

Distance from the sun: 92.96 million mi

6 0
3 years ago
On a planet with different gravity, would the molarity of water be different? explain your reasoning.
ruslelena [56]

On a planet with different gravity, the molarity of water won't be different as water produces regular natural gravity.

<h3>How to explain the gravity?</h3>

Although sunlight is the energy source, gravity is the main factor driving the water cycle. The Earth's gravity pulls matter downward and toward its center. Gravity is the force that attracts two objects. It pushes water downhill and precipitation from the clouds. Air and ocean water are also moved by gravity.

We understand that even if the gravitational pull varies throughout the universe, the molarity of water would be constant everywhere. This is thus because a substance's mass is unaffected by gravity; only its weight is. The quantity (or mass, indirectly) of a solute is used to calculate the molarity.

Here, on a planet with different gravity, the molarity of water won't be different as water produces regular natural gravity.

Learn more about gravity on:

brainly.com/question/557206

#SPJ1

5 0
1 year ago
what is the distance moved by a particle moving along x axis if it starts from x=-7m goes upto x= -12m turns and stops at x=+34m
Marizza181 [45]

Answer: Trajectory=51m

Displacement=41m

Explanation:

Let's begin by stating clear that <u>movement is the change of position of a body at a certain time.</u> So, during this movement, the body will have a trajectory and a displacement, being both different:

The trajectory is the path followed by the body (is a scalar magnitude).  

The displacement is the distance in a straight line between the initial and final position (is a vector magnitude).  

According to this, in the description of the object placed at x= -7m on a number line and moving some 12m to the left and then to the right, stopping at x=34m; we are talking about the path followed by the object, hence its <u>trajectory</u>. So, 51 m is its trajectory.

But, if we talk about displacement, we have to draw a straight line between the initial position of the object (x=-7m) to its final position (x=+34m).

Now, being this an unidimensional problem, the displacement vector for this object is 41m.

7 0
3 years ago
Mary takes 6.0 seconds to run up a flight of stairs that is 102 meters long. If Mary's weight is 87 newtons, what power has Mary
fredd [130]

Answer: 1479watts

Explanation:

Power is defined as the energy expended or work done in a specific time.

Mathematically,

Power = Workdone/time taken

Since work done is force × distance

Power = force × distance/time

Force = Mary's weight = 87N

Distance = height of the flight = 102meters

Time = 6.0seconds

Substituting in the formula we have;

Power = 87 × 102/6

Power = 1,479watts

Note that the time must be in seconds before usage. If its given in minutes, you will have to convert to seconds

8 0
4 years ago
Which object will have more inertia a 100kg rock a 5kg book a 60kg person or a 2000kg car
SSSSS [86.1K]
The formula for solving the inertia (I) is I=mr² where "m" represents the mass of an object and "r" represents the perpendicular distance to the rotation axis.
item 1= 100 kg rock
Item 2= 5kg book
item 3= 60kg person
item 4=2000kg car.

The answer is the last item which is a 2000kg car.
7 0
3 years ago
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