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Which of the following is true for sound waves?
-They require a medium
-They are unrelated to vibrations.
-They can travel in a vacuum
-They cannot travel through liquids
-None of the above

Answer:  0.6

Explanation: I'm doing the projectile motion problem solving and I was stuck but I guessed and choose that answer and it said I was correct.

Answer:

If they put their hands near their neck, if they're not breathing properly, if they aren't coughing.

Explanation:

Answer:

if they are struggling to breathe, attempting to cough (like coughing something up) or asking for help whilst holding their stomach, neck

Answer:

True

Explanation:

External forces such as extreme weather pose a constant threat to the structural reliability of structures.

Extreme weather conditions such as a high temperature or rainfall have an effect on structures due to the constant exposure of the structures to this factors. The materials used in building these structures have different properties which are usually affected by environmental factors.

Answer:

Power = 0.33 Watts

Explanation:

Given the following data;

Distance = 1m

Force = 20N

First of all, we would solve for the work done by the boy.

Workdone = force * distance

Substituting into the equation, we have;

Workdone = 20*1 = 20J

Now to find power;

Power = workdone/time

Power = 20/60

Power = 0.33 Watts.

Answer:

W = 83 [N] (weight)

Explanation:

We must clarify that the system is in static equilibrium, in such a way that we must perform a sum of forces on the Y-axis equal to zero, in order to determine the downward force corresponding to the weight of the child.

∑Fy = 0

[tex]F_{1}+F_{2}-m*g=0\\18+65=m*g\\m*g = 83 [N][/tex]

And the mass can be determined as follows:

[tex]m*g=83\\m = 83/9.81\\m=8.46[kg][/tex]

The weight of the child is equal to 83 Newton.

Given the following data:

To determine the weight of the child:

From the diagram, we can deduce that the system is in static equilibrium. Thus, we would resolve the horizontal component of the forces, in order to determine the downward force (weight of child).

Mathematically, the horizontal component of the forces is given by:

[tex]\sum F_y = 0\\\\F_1 +F_2 -mg=0[/tex]

Substituting the given parameters into the formula, we have;

[tex]18+65-mg=0\\\\83=mg[/tex]

Note: Weight = mg

Weight of child = 83 Newton.

Read more: https://brainly.com/question/366299

Answer:

At 2km/h*s it is changing speed every 2 seconds.

At 4km/h*s it is changing speed every 4 seconds.

At 10km/h*s it is changing speed every 10 seconds.

Answer: 10

Explanation:

Answer:

9.1km/hr...................I think I'm not %100

Answer:

They do this by joining pieces of different Rock sequences together from different places in the whole world.

Explanation:

Geologic columns are basically an arrangement of rock layers whereby the newest rocks are at the top while the oldest rocks will be at the bottom. Thus, it is like a timescale that's used to find the age of rock formation on the earth around the world.

Answer:

YES. 6√10

Explanation:

apply E=1/2mv^2 and find the velocity of carriage which is 6√10 ms-1

as our velocity is higher than that of cart. we can catch the carriage

Answer:

im going to guess the 3rd one

Explanation:

Answer:

Explanation:

0.02

0.604

70,230

becuase if you take away the 0 then it would change the value of the number

Answer:

[tex]a=3.90\ m/s^2[/tex]

Explanation:

Given that,

Initial velocity, u = 50 m/s

Final velocity, v = 75 m/s

DIstance, d = 400 m

We need to find the acceleration of the car. Let the acceleration of the car be a. We can use the third equation of motion to find it as follows :

[tex]v^2-u^2=2ad\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(75)^2-(50)^2}{2(400)}\\\\=\dfrac{3125}{2(400)}\\\\=3.90\ m/s^2[/tex]

So, the acceleration of the car is [tex]3.90\ m/s^2[/tex].

Answer:

43.83 nC

Explanation:

We know Q = ε₀Ψ where Q = charge enclosed by the cubic box,  ε₀ = permittivity of free space = 8.854 × 10⁻¹² F/m and Ψ = net electric flux through cubic box = 4950 Nm²/C

So, substituting the values of the variables into the equation, we have

Q = ε₀Ψ

= 8.854 × 10⁻¹² F/m × 4950 Nm²/C

= 43827.3 × 10⁻¹² C = 4.38273 × 10⁻⁸ C

= 43.8273 × 10⁻⁹ C

= 43.8273 nC

≅ 43.83 nC

Answer:

[tex]5.241\ \text{m/s}[/tex]

Explanation:

m = Masa del coche

g = Aceleración debida a la gravedad = [tex]9.81\ \text{m/s}^2[/tex]

h = Altura = [tex]1.4\ \text{m}[/tex]

v = Velocidad del automóvil en la parte inferior de la pista

Aquí asumimos que el automóvil desciende verticalmente. La energía potencial del automóvil se completará convertida en energía cinética en la parte inferior de la pista ya que no hay pérdida de energía.

[tex]mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 1.4}\\\Rightarrow v=5.241\ \text{m/s}[/tex]

La velocidad máxima que puede alcanzar el coche es [tex]5.241\ \text{m/s}[/tex].

Answer: overjustification

Explanation:

The overjustification effect is a situation that occurs when an incentive like prizes or money or prizes leads to the reduction in an individual's intrinsic motivation that is necessary in performing a task.

In this case, because the children are motivated by money, when the take doesn't involve money anymore, they may not be willing to do it.

Answer:

[tex]F_r \approx 978.3N[/tex]

[tex]\theta =44 \textdegree[/tex]

Explanation:

From the question we are told that

Connie pulls with a force of [tex]F_c=200 N[/tex]

At an angle [tex]\theta _c=20 \textdegree[/tex]

Randolph pulls with a force of [tex]F_R=800 N[/tex]

At an angle [tex]\theta _R=50 \textdegree[/tex]

Generally the horizontal axis  can mathematically be represented as

[tex]f_x=f_ccos\theta _c+F_Rcos\theta _R[/tex]

[tex]f_x=200*cos20+800*cos50[/tex]

[tex]f_x=702.2N[/tex]

Generally the vertical axis  can mathematically be represented as

[tex]f_y=f_csin\theta _c+F_Rsin\theta _R[/tex]

[tex]f_y=200*sin20+800*sin50[/tex]

[tex]f_y=681.24N[/tex]

Generally the resultant force [tex]F_r[/tex] is mathematically  given by

[tex]F_r=\sqrt{f_x^2+f_y^2}[/tex]

[tex]F_r=\sqrt{702.1686119^2+681.2395832^2}[/tex]

[tex]F_r=978.3230731N[/tex]

[tex]F_r \approx 978.3N[/tex]

Generally the Direction [tex]\theta[/tex] of force is mathematically given by

[tex]\theta =tan^-^1(\frac{f_c}{f_y})[/tex]

[tex]\theta =tan^-^1(\frac{681.23}{702.16})[/tex]

[tex]\theta =44 \textdegree[/tex]

Answer:

Explanation:

Due to heat energy , metal expands . Formula for linear expansion is as follows .

L = l ( 1 + α Δt )

where L is expanded length , l is original length , α is coefficient of linear expansion and Δt is increase in temperature .

To pass the sphere through the ring , the diameter of both ring and sphere should be same after heating . Let after increase of temperature Δt , their diameter becomes same as L  . The linear coefficient of brass and steel are

20 x 10⁻⁶ and 12 x 10⁻⁶ respectively .

For steel sphere ,

L = 25 ( 1 + 12 x 10⁻⁶ Δt )

For brass ring

L = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

25 ( 1 + 12 x 10⁻⁶ Δt ) = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

1.004( 1 + 12 x 10⁻⁶ Δt ) =  ( 1 + 20 x 10⁻⁶ Δt )

1.004 + 12.0482 x 10⁻⁶ Δt  =   1 + 20 x 10⁻⁶ Δt

.004 = 7.9518 x 10⁻⁶ Δt

Δt  = 4000 / 7.9518

= 503⁰C.

final temp = 503 + 15 = 518⁰C  .

Answer:

False. They can’t change the charge but they can change the mass

Answer:

alam ko sagot pero mataas

Answer:

1) e

2)c

3)b

4)d

i dont know if these are right, but something along these lines if you understand the pattern

Explanation:

Answer:

Both Electrical and Magnetic Forces take place between two charged objects

Explanation:

Answer:

B) a leaf blown from a tree by the wind

Answer:

the answer is B A leaf being blown from a tree by the ground

Answer:

dsadadas

Explanation:

dadadda

Answer:

The average velocity is 4 [tex]\frac{km}{hour}[/tex]

Explanation:

Velocity is the magnitude that relates the change in position with time. That is, the speed expresses the relationship between the space traveled by an object and the time used for it.

The average velocity relates the change in position with the time taken to effect said change through the expression:

[tex]velocity=\frac{distance}{time}[/tex]

In this case:

Replacing:

[tex]velocity=\frac{12 km}{3 hours}[/tex]

Solving:

velocity= 4 [tex]\frac{km}{hour}[/tex]

The average velocity is 4 [tex]\frac{km}{hour}[/tex]

Answer:

Explanation:

It is easier to see clothes with pointed needle than a blunt one because pressure exerted is more in a pointed needle as it occupies less space compared to blunt needle, A blunt has more surface area so the pressure exerted will less as compared to a pointed needle.

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Answer:

The frequency of a wave whose time period is 0.002 second is 500 Hz

Explanation:

Given,

Time period of wave = 0.002 seconds

We know,

Frequency = 1 / Time period

Substituting the values;

= 1 / 0.002sec

= 1000/2

Frequency =  500Hz

Hence,

The frequency of a wave whose time period is 0.002 second is 500 Hz