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GREYUIT [131]
4 years ago
6

What is echo?.....................​

Physics
2 answers:
mestny [16]4 years ago
5 0

Answer:

An echo is a sound  caused by the reflection of sound waves from a surface back to the listener.

Explanation:

fgiga [73]4 years ago
4 0

Answer:

It is the sound reflected/bounced back from an object to your ears.

You hear echo when there is a vast space with no objects around because since there are no objects to absorb the sound, the sound get bounced back to you.

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What build proteins for cell function in a animal cell
Zepler [3.9K]
Ribosome are used for protein synthesis
7 0
4 years ago
A typical atomic polarizability is 1 × 10-40 (C·m)/(N/C). If the q in p = qs is equal to the proton charge e, what charge separa
Alenkasestr [34]

Answer:

s = 6.25 10⁻²² m

Explanation:

Polarizability is the separation of electric charges in a structure, in the case of the atom it is the result of the separation of positive charges in the nucleus and the electrons in their orbits, macroscopically it is approximated by

                p = q s

               s = p / q

let's calculate

              s = 1 10⁻⁴⁰ / 1.6 10⁻¹⁹

              s = 0.625 10⁻²¹ m

              s = 6.25 10⁻²² m

We see that the result is much smaller than the size of the atom, therefore this simplistic model cannot be taken to an atomic scale.

6 0
3 years ago
3. A bicycle has a momentum of 25.00 kg* m/s and a velocity of 2.5 m/s . What is the bicycle's
Anna35 [415]

Answer:

10 kg

Explanation:

The question is most likely asking for the mass of the bicycle.

Momentum is the product of an object's mass and velocity. Mathematically:

p = m * v

Where p = momentum

m = mass

v = velocity

Hence, mass is:

m = p / v

From the question:

p = 25 kgm/s

v = 2.5 m/s

Mass is:

m = 25 / 2.5 = 10 kg

The mass of the bicycle is 10 kg.

In case the question requires the Kinetic energy of the bicycle, it can be gotten by using the formula

K. E = ½ * p * v

K. E. = ½ * 25 * 2.5 = 31.25 J

5 0
4 years ago
In some cases fixture wires may be used for
zalisa [80]

You can use fixture wires: For installation in luminaires where they are enclosed and protected and not subject to bending and twisting and also can be used to connect luminaires to their branch circuit conductors.

<h3>What are some uses of fixture wires?</h3>

Fixture wires are flexible conductors that are used for wiring fixtures and control circuits. There are some special uses and requirements for fixture wires and no fixture can be smaller than 18 AWG

In modern fixtures, neutral wire is white and the hot wire is red or black. In some types of fixtures, both wires will be of the same color.

To know more about fixture wires, refer

brainly.com/question/26098282

#SPJ4

3 0
1 year ago
A light string is wrapped around the outer rim of a solid uniform cylinder of diameter 75.0 cm that can rotate without friction
anyanavicka [17]

Answer:18.5 kg

Explanation:

Given

diameter d=75 cm

mass of stone m=3 kg

velocity of stone v=3.4 m/s

height fallen h=2.40 m

using

v^2-u^2=2as

(3.4)^2=2\times a\times 2.4

a=2.4 m/s^2

Tension of string will Provide Torque to cylinder

T\times r=I\times \alpha

where I=moment\ of\ inertia

\alpha =angular\ acceleration

T=\frac{Mr^2}{2}\times \frac{a}{r}

T=\frac{Ma}{2}

and mg-T=ma

mg-ma=T

Put value of T

mg-ma=\frac{Ma}{2}

mg=a(m+\frac{M}{2})

3\times 9.8=2.4\cdot (m+\frac{M}{2})

12.25=3+\frac{M}{2}

9.25=\frac{M}{2}

M=18.5 kg

4 0
4 years ago
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