An electric buzzer is activated, then sealed inside a glass chamber. When all of the air is pumped out of the chamber, how is the sound from the buzzer affected?The sound is silenced.
The wavelength of the sound increases.
The frequency of the sound increases.
The wave speed of the sound increases.

Answers

Answer 1

Answer:
The answer is that the sound is increased because the sound waves are mechanical waves, this means that they can't travel trough empty space they need a medium to travel.

Answer 2

Answer:

Answer:

The sound is silenced.

Explanation:

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A person walks 25 m west and then 45 m at the angle of 60 degrees north of east what is the magnitude of the total displacement?

4. The density and strength of concrete are determined by the ratio of cement and aggregate. Suppose that a contractor has 480 cubic feet of a dry concrete mixture that is 70% sand by volume. How much pure sand must be added to form a new mixture that is 75% sand by volume?

Answers

Answer:

The answer is 96ft^3

Explanation:

T=initial concrete mixture

S1=initial amount of sand

S2=final amount of sand

T2=final amount concrete mixture

C=amount of cement

Data:

T=480Ft^3

the quantities of the initial mixture are

S=0.7*480=336Ft^3

C=0.3*480=144 Ft^3

we pose the following equations

144+S2=T2

T2*0.75=S2

if we solve

S2=144/(1/0.75-1)=432ft^3

to know how much we should add we subtract it from the initial amount of sand

Answer=432ft^3-336ft^3=96ft^3

What happens to the room temperature in ehich an air conditioner is lefy running on a table in the midle of the room

Answers

An air conditioner takes heat out of the air that runs through it. It has to put that heat somewhere. If it can't blow the heat out of the room then the heat stays in the room. But that's not all. While it's running the air conditioner also uses electrical energy to run. And that generates more heat. So if there's an air conditioner running in a closed room then the room will get warmer.

it will get cold only in that room. if you also have it in a room and close the door it will also get colder. sorry if this didnt help.

a string is attached to the rear-view mirror of a car. a ball is hanging at the other end of the string. the car is driving around in a circle, at a constant speed. which of the following lists gives all of the forces directly acting on the ball?

Answers

The correct answer for the question that is being presented above is this one: "b. tension, gravity and centripetal force." It gives all of the forces directly acting on the ball.

Here are the following choices:
a. Tension and gravity
b. tension, gravity and centripetal force
c. Tension
d. Tension gravity centripetal force and frictional force

The waste products of a nuclear fission powerplant can best be described asa. Small in quantity and not very dangerous.
b. Large in quantity and not very dangerous.
c. Large in quantity and very dangerously radioactive. Eliminate
d. Small in quantity and very dangerously radioactive.

Answers

The answer is D. small in quantity and very dangerously radioactive.

a.

-> the products are stable atoms with a much lower atomic number. For example, Uranium 238 commonly breaks down into strontium and xenon, both of which are stable and non-radioactive.

They are also low in quantity because of the precision involved in breaking down a large atom via neutron capture means that few fission reactions take place.

Hope I helped :)

Source: I studied nuclear physics in year 11

Four landing sites are proposed for a lander. Data about the sites are listed in the table.A 3 column table with 4 rows. The first column is labeled landing site with entries W, X, Y, Z. The second column is labeled height above surface in meters with entries 32, 16, 35, 12. The last column is labeled acceleration due to gravity in meters per second squared with entries 1.6, 3.7, 1.6, 3.7.
At which landing site would the lander have the greatest amount of gravitational potential energy?

A. W
B. X
C. Y
D. Z

Answers

Answer:

Explanation:

The greatest amount of gravitational potential energy at landing site X

What is the greatest gravitational potential energy?

To calculate the gravitational potential energy at each landing site, we can use the formula:

Gravitational Potential Energy (PE) = mass × acceleration due to gravity × height above surface

If the mass is assumed to be constant, we can ignore it and focus on the acceleration due to gravity and height above the surface.

From the table, we can see that the lander would have the greatest amount of gravitational potential energy at landing site X, with a value of 592.8 Joules.

If the current through R1 is 2A what is the current through R2