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4 years ago

If the pitch of the sound coming out of a speaker increases, which statement is true about the sound wave?

1 answer:

9 0

As we know that the pitch of sound is directly proportional to the frequency as the frequency increases the pitch of sound increases and wavelength decreases
so the correct option is B
hope it helps<span />

You might be interested in

A force acts on a moving rubber ball.

s344n2d4d5 [400]

Answer:

Explanation:

because it would change the direction and speed

8 0

2 years ago

What happens when two black holes collide?

Sonja [21]

Answer:

When the black holes get close to each other, they fuse into one, bigger black hole. The new black hole’s radius will be roughly the sum of the two original black hole’s radii, making the new black hole encompass a much bigger volume. The fusion is somewhat like what two water droplets would do in space when they get close.

Also importantly, the black holes emit copious amounts of gravitational waves as they close in on each other. This can turn a few percent of their mass into pure energy radiated away as gravitational waves.

We detected the collision of two black holes for the first time not too long ago, in 2015, following the construction of the Advanced LIGO gravitational-wave observatories. With continued technological improvements, we will go from this first detection to a discovery every week in the next few years. While we observe these collisions, we don’t yet know what cosmic process brings the black holes close to each other so they can collide. Observing these collisions can also help us answer a range of outstanding questions, such as how black holes work as cosmic particle accelerators, or whether Einstein’s General Theory of Relativity is the correct description of nature. Black hole collisions can even help us better map how the Universe is expanding.

8 0

3 years ago

A 10 kg block is pulled across a horizontal surface by a rope that is oriented at 60° relative to the horizontal surface. What i

leva [86]

Answer:

145.6 J work is done by the tension.

Explanation:

Given:

Mass of the block (m) = 10 kg

Displacement of the block (d) = 10 m

Coefficient of kinetic friction (μ) = 0.2

Angle between the tension force and the displacement (x) = 60°

The block is moving with a constant velocity.

We know that, if a body moves with a constant velocity, then the acceleration of the body is zero as acceleration is the rate of change of velocity.

Now, from Newton's second law, the net force acting on a body is directly proportional to its acceleration. So, if acceleration of the block is zero, then the net force acting on the block is also zero.

Here, the forces acting on the block along the direction of motion of block are:

Component of tension force in the direction of displacement.
Frictional force in the direction opposite to displacement.

Now, as the net force is zero, both the forces stated above must be equal in magnitude.

Therefore, the tension component in the direction of displacement is given as:

$T_x=T\cos x$

Where, 'T' is the tension in the rope.

$T_x=T\times 0.5=0.5T----(1)$

Now, consider the vertical direction. There is no motion in the vertical direction. So, net force is zero or net upward force is equal to net downward force. This gives,

$T_y+N=mg\\\\T\sin x+N=mg\\\\N=mg-T\sin x\\\\N=10\times 9.8-T\sin 60^\circ\\\\N=98-\frac{\sqrt3T}{2}-------(2)$

Now, frictional force is given as:

$f=\mu N\\\\f=0.2N$

From equation (2), we get:

$f=0.2(98-\frac{\sqrt3}{2}T)\\\\f=19.6-\frac{\sqrt3T}{10}-------(3)$

Now, as net force in horizontal direction is zero, we have:

$T_x=f$

From equations (1) and (3), we have:

$0.5T=19.6-\frac{\sqrt3T}{10}\\\\0.5T+\frac{\sqrt3T}{10}=19.6\\\\0.673T=19.6\\\\T=29.12\ N$

Now, work done is given as:

Work = Force × Displacement × cos x

$W=Td\cos x\\\\W=29.12\times 10\times \cos 60^\circ\\\\W=145.6\ J$

Therefore, 145.6 J work is done by the tension.

6 0

3 years ago

How are land-use laws in the United States different from the land-use laws inherited from England?

ycow [4]

<span>Private property owners must allow for public access and use.</span>

7 0

4 years ago

Read 2 more answers

What do the Celsius scale and kelvin scale have in common? A. Both have the same temperature difference between degrees. B. Both

aleksandrvk [35]

Think the answer is A. Both Celcius and kelvin has the temperature difference of 273 (decimal values are there). that means when an object is 0 degree celcius it would also be 273 degree kelvin. (100C = 373K). Think thats the correct answer. almost 99% sure

4 0

3 years ago

Read 2 more answers