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3 years ago

Which statement regarding sound traveling in air is correct?

Physics

1 answer:

nikdorinn [45]3 years ago

6 0

Answer: D. A wave with a shorter wavelength is always faster than one with a longer wavelength

Explanation: "Imagine two sets of waves that have the same speed. If one set has a longer wavelength, it will have a lower frequency (more time between waves). If the other set has a shorter wavelength, it will have a higher frequency (less time between waves). Light moves even faster AND has shorter wavelengths."

Why it's not C: "The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer."

Why it's not B: "The frequency does not change as the sound wave moves from one medium to another. Since the speed changes and the frequency does not, the wavelength must change."

Why it's not A: "Do loud sounds travel faster than soft sounds? No. Both travel at the same speed The speed depends on the medium it passes through. Louder sounds are simply sound waves with higher amplitude traveling at the same speed."

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She sights two sailboats going due east from the tower. The angles of depression to the two boats are 42o and 29o. If the observ

Reika [66]

Answer:

The boats are 934.65 feet apart

Explanation:

Given:

The angles of depression to the two boats are 42 degrees and 29 degrees

Height of the observation deck i = 1,353 feet

To Find:

How far apart are the boats (y )= ?

Solution:

Step 1 : Finding the value of x(Refer the figure attached)

We can use the tangent ratio to find the x value

$tan(42^{\circ}) = \frac{1353}{x}$

$x = \frac{1353}{tan(42^{\circ}) }$

x = 590.47 feet

Step 2 : Finding the value of z (Refer the figure attached)

$tan(29^{\circ}) = \frac{1353}{z }$

$z = \frac{1353}{tan(29^{\circ})}$

z = 1525.12 feet

Step 3 : Finding the value of y (Refer the figure attached)

y = z -x

y = 1525.12 - 590.47

y = 934.65 feet

Thus the two boats are 934.65 feet apart

3 0

3 years ago

Two students push on a 5-kg cart from opposite sides

sweet-ann [11.9K]

Answer:

nothing will happen the cart will be broken or as it is

4 0

3 years ago

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What is Newtens first law of motion

OlgaM077 [116]

Newtons first law states that an object will remain still or in straight line. Until acted upon some force!

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3 years ago

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A constant force of 3.2 N to the right acts on a 18.2 kg mass for 0.82 s. (a) Find the final velocity of the mass if it is initi

zheka24 [161]

Explanation:

The given data is as follows.

F = 3.2 N, m = 18.2 kg,

t = 0.82 sec

(a) Formula for impulse is as follows.

I = Ft = $\Delta P$

Ft = $m(v_{f} - v_{i})$

or, $v_{f} = \frac{Ft}{m} + v_{i}$

Putting the given values into the above formula as follows.

$v_{f} = \frac{Ft}{m} + v_{i}$

= $\frac{3.2 \times 0.82}{18.2} + 0$

= 0.144 m/s

Therefore, final velocity of the mass if it is initially at rest is 0.144 m/s.

(b) When velocity is 1.85 m/s to the left then, final velocity of the mass will be calculated as follows.

Ft = $m(v_{f} - v_{i})$

or, $v_{f} = \frac{Ft}{m} + v_{i}$

= $\frac{3.2 \times 0.82 sec}{18.2} - 1.85$

= -1.705 m/s

Hence, we can conclude that the final velocity of the mass if it is initially moving along the x-axis with a velocity of 1.85 m/s to the left is 1.705 m/s towards the left.

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What property appplies to the element radon?

Arlecino [84]

Radioactive element
I. E..,ratio of neutrons is to protons is greater than 1.5

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