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Kryger [21]
3 years ago
10

When you hear an echo you are hearing a ________of the original sound wave

Physics
1 answer:
krek1111 [17]3 years ago
7 0

Answer:

reflection

Choice D is correct

Explanation:

An echo is simply a reflection of the original sound wave which arrives at the listener with a delay after the original sound.  Sound waves can be reflected, that is bouncing off objects in the same manner a solid object can bounce off the ground. The echo sounds entirely the same as the original sound but the direction of the sound is altered.

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A 40 kg bike traveling down the road has a negative acceleration. What is true of the force? A. It is positive B. It doesn't exi
Greeley [361]

Answer:

C. It is negative

Explanation:

Per Newton's second law, the net force is the mass times the acceleration:

∑F = ma

If the acceleration is negative, the net force is negative.

4 0
3 years ago
Read 2 more answers
a body is thrown vertically upward from the earth's surface and it took 8 seconds to return to its original position . find out
Mnenie [13.5K]

Answer:

The initial velocity with which the body was thrown up is 39.2 m/s

Explanation:

The given parameters for the body are;

The time it takes the body to return back to its initial position = 8 seconds

To answer the question, we make use of the kinematic equation of motion, v = u - g·t

Where

v = The final velocity of the body = 0 m/s at the maximum height

u = The initial velocity

g = The acceleration due to gravity = 9.8 m/s²

t = The time in which the body spends in the air

Therefore, at maximum height, we have;

v = 0 = u - g·t

u = g·t

t = u/g

From h = 1/2gt², which gives t = √(2·h/g), the time the body takes to maximum height = The time the body takes to return to its original position from maximum height.

Therefore, the total time in which the body is in the air = 2 × t = 2× u/g

∴

The total time in which the body is in the air = The time it takes the body to return back to its initial position after being thrown = 2 × t =  8 seconds

∴ 2 × t = 8 s = 2 × u/g

8 s = 2 × u/g

u = (8 s × g)/2

∴ u = (8 s × 9.8 m/s²)/2 = 39.2 m/s

The initial velocity with which the body was thrown up = u = 39.2 m/s.

4 0
2 years ago
At what frequency will a 31.0 mH inductor have a reactance of 637.0 Ω?
Shtirlitz [24]

Answer:

3272.4 Hz

Explanation:

L = 31 mH

XL = 637 ohm

XL = 2 π f L

f = XL / (2 π L)

f = 637 / ( 2 x 3.14 x 31 x 10^-3)

f = 3272.4 Hz

5 0
3 years ago
If the earth had no atmosphere, would a falling object reach terminal velocity? Explain
Fynjy0 [20]
Terminal velocity is the point when an accelerating object reaches a constant speed. When an object is in free fall on earth, this happens due to the drag force of the atmosphere that pushes up on the object.
If the earth had no atmosphere, the object would keep accelerating and never reach terminal velocity due to the lack of air drag.
5 0
3 years ago
Molecules are different from atoms because they
kap26 [50]

Answer:

The answer is D

Explanation:

because molecules contain bonds that help create a chemical reaction. Atoms are part of that bond, molecules are made up of atoms.

4 0
3 years ago
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