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velikii [3]
3 years ago
6

IN which of the following conditions would a person not hear an echo? A. A sound wave reaches the ear, and the reflected wave re

aches the ear less than 0.1 seconds later, B. A person is standing in the range of the sound waves coming from the original sound sources as well as the reflected waves, C. The reflecting wave source is approximately 21.5 meters from the person, D. a person is standing 30 meters in front of the reflecting surface.
Physics
2 answers:
GenaCL600 [577]3 years ago
7 0

Answer:

A. A sound wave reaches the ear, and the reflected wave reaches the ear less than 0.1 seconds later,

Explanation:

Human hear can not differentiate two successive sounds when the period between the sounds is less than 0.1 seconds.When the distance between the source of sound and the reflecting surface is less than 17 meters, you can't hear any echo.These two factors go together.If the distance is less than 17 meters, the echo will be less than 0.1 seconds thus the ear won't pick it.

Misha Larkins [42]3 years ago
4 0

Answer:

a.  A sound wave reaches the ear and the reflected wave reaches the ear less than 0.1 second later.

Explanation:

bc i said so<< :))) pf

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The angular speed of the rotor in a centrifuge increases from 420 to 1420 rad/s in a time of 5.00 s. (a) Obtain the angle throug
9966 [12]

Answer:

a) θ = 2500 radians

b) α = 200 rad/s²

Explanation:

Using equations of motion,

θ = (w - w₀)t/2

θ = angle turned through = ?

w = final angular velocity = 1420 rad/s

w₀ = initial angular velocity = 420

t = time taken = 5s

θ = (1420 - 420) × 5/2 = 2500 rads

Again,

w = w₀ + αt

α = angular accelaration = ?

1420 = 420 + 5α

α = 1000/5 = 200 rad/s²

6 0
3 years ago
Read 2 more answers
What are the two sources of earth's internal heat energy
RUDIKE [14]

Answer:

Hey

Your answer would be Radioactive Decay and Heat of formation.

When earth first formed it was very violant. Some planetary scientists believe that the moon was created from a collision involving earth and Thea (a theoretical dwarf planet). these collisions that have formed earth heated it so much that it is still hot from them.

Radioactivce decay is another major fource of internal heat for earth.

6 0
2 years ago
A spherical helium filled balloon (B) with a hanging passenger cage being held by a single vertical cable (C) attached to Earth
Gre4nikov [31]

Answer:

The tension is  T  = 4326.7 \  N

Explanation:

From the question we are told that

   The  total mass is  m  =  200 \  kg

    The  radius is r = 5 \  m

     The  density of air is  \rho_a  =  1.225 \ kg/m^3

Generally the upward  force acting on the balloon is mathematically represented as

        F_N  =   T  + mg

=>     (\rho_a  *  V  *  g ) =   T  + mg

=>   T  =  (\rho_a  * V  *  g   )  - mg

Here V is the volume  of the spherical helium filled balloon which is mathematically represented as

      V  =  \frac{4}{3}  * \pi r^3

=>   V  =  \frac{4}{3}  * 3.142 *(5)^3

=>   V  = 523.67\  m^3

So

    T  = (1.225 *  523.67*  9.8 ) -  200 *  9.8

   T  = 4326.7 \  N

5 0
3 years ago
Someone please answer this, ill give you brainliest and your earning 50 points.
Tema [17]

All of the following are non-renewable resources except

O natural gas

O oil

O minerals

O <em>water ✓ </em>

  • <em>Water </em><em>is </em><em>a </em><em>renewable </em><em>source </em><em>because </em><em>evaporation </em><em>and </em><em>condensation </em><em>takes </em><em>place </em><em>everytime </em><em>on </em><em>our </em><em>planet</em>
3 0
1 year ago
Read 2 more answers
After clearing the bar on a high jump, you land softly on a giant mattress. landing on a mattress is more comfortable than landi
madam [21]

Answer:

The right approach is Option b (the force..................exert on you).

Explanation:

  • Even before you fall on something like a soft object, users eventually slow to a halt. You are still giving away all the downward momentum, but progressively although with small powers, you are doing so.  
  • Although you can get injured by massive powers, this gradual displacement is a positive thing. And that is why you have a mattress you would like to settle on.  

The other options given are not connected to the situation described. So, the solution here was the right one.

3 0
2 years ago
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