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3 years ago

The air is soundproof??

2 answers:

7 0

Not possible. The air is actually able to travel sound throughout itself without any difficulties. I believe, air actually brings sound closer to the people farther away ; It really helps to stretch sound.

Veseljchak [2.6K]3 years ago

6 0

Air isnt soundproof, actually places that have no air (like outer space) aka vaccum are soundproof .

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A wall with a surface area of 10 m2 is 2.5 cm thick. The inner surface temperature of the wall is 4150C, but the outer surface i

klio [65]

Answer:

650.65 K or 377.5°C

Explanation:

Area = A = 10 m²

Thickness of wall = L = 2.5 cm = 2.5×10⁻² m

Inner surface temperature of wall = $T_i$ = 415°C = 688.15 K

Outer surface temperature of wall = $T_o$

Heat loss through the wall = 3 kW = 3×10³ W

Thermal conductivity of wall = k = 0.2 W/m K

Assumptions made here as follows

There is not heat generation in the wall itself
The heat conduction is one dimensional
Heat flow follows steady state
The material has same properties in all directions i.e., it is homogeneous.

Considering the above assumptions we use the following formula

$Q=\frac {T_i-T_o}{\frac{L}{kA}}\\\Rightarrow T_o=T_i-\frac {QL}{kA}\\\Rightarrow T_o=688.15-\frac {3\times 10^{3}\times 2.5\times 10^{-2}}{0.2\times 10}\\\Rightarrow T_o=650.65~K$

∴ The temperature of the outer surface of the wall is 650.65 K or 377.5°C

5 0

3 years ago

A five pulley system is used to lift a load

faltersainse [42]

Answer:

Primary Logo

Machine

Subject: Science

Home Grade 9 Science Machine Machine

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Syllabus

Measurement

Force

Machine

Types of Simple Machine

Moment

Work Energy and Power

Sound

Light

Electricity and Magnetism

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Overview

Simple machine helps us by magnifying force, accelerating work and by changing the direction of force. This notes gives us the information about machine, its importance, mechanical advantage, velocity ratio.

Note

Things to remember

Videos

Exercise

Quiz

Machine

We use various tools to perform different types of work in our daily life. The tools or simple devices used for making our work easier, faster and more convenient are simple machines.

Those tools or devices which make our work easier and convenient in the direction of the force is called simple machine.

Purpose of using simple machine

Simple machines are used to make our work easier in the following ways:

By multiplying force.

By changing the directions of force.

By transferring force from one point to another.

By increasing the rate of doing work.

THIS CAN HELP U

7 0

3 years ago

What kind of enery does the soccer player transfer to the ball

ElenaW [278]

It's called mechanical energy.

3 0

3 years ago

Read 2 more answers

An object moves with constant acceleration 4.05 m/s2 and over a time interval reaches a final velocity of 11.2 m/s.

aleksandrvk [35]

a) Displacement: 11.6 m

b) Distance: 11.6 m

c) Displacement: 11.6 m

d) Distance: 19.4 m

Explanation:

The motion of the object is a uniformly accelerated motion, so we can use the following suvat equation to find the displacement:

$v^2-u^2=2as$

where

s is the displacement

u is the initial velocity

a is the acceleration

v is the final velocity

For the object in this problem,

u = 5.60 m/s

v = 11.2 m/s

$a=4.05 m/s^2$

Solving for s, we find the displacement:

$s=\frac{v^2-u^2}{2a}=\frac{11.2^2-5.60^2}{2(4.05)}=11.6 m$

Since the motion of the object is in a straight line and the direction of the velocity does not change, the distance is equal to the displacement, therefore

d = 11.6 m

We can find the displacement of the object in this case by using again the equation

$v^2-u^2=2as$

where

s is the displacement

u is the initial velocity

a is the acceleration

v is the final velocity

This time, we have:

u = -5.60 m/s

v = 11.2 m/s

$a=4.05 m/s^2$

Solving for s, we find the displacement:

$s=\frac{v^2-u^2}{2a}=\frac{11.2^2-(-5.60)^2}{2(4.05)}=11.6 m$

In this case, the velocity of the object changes direction: this means that for part of the trip the object moves in the negative direction, and for part of the trip it moves in the positive direction. Therefore, the distance is not equal to the displacement.

In order to find the distance, we have to calculate first the distance covered when the object is moving in the negative direction; so, from when it has velocity of

u = -5.60 m/s

to when it has a velocity of

v = 0

Therefore,

$d_1=\frac{v^2-u^2}{2a}=\frac{0-(-5.60)^2}{2(4.05)}=3.9 m$

Then, we have to add the distance covered from when the object has velocity

u = 0

to when it has velocity of

v = 11.2 m/s

Therefore,

$d_2=\frac{v^2-u^2}{2a}=\frac{11.2^2-(0)^2}{2(4.05)}=15.5 m$

Therefore, the total distance covered is

$d=d_1+d_2=3.9 + 15.5=19.4 m$

Learn more about distance and displacement:

brainly.com/question/3969582

#LearnwithBrainly

5 0

3 years ago

The energy released by the exploding gunpowder in a cannon propels the cannonball forward. Simultaneously the cannon recoils. Wh

Neporo4naja [7]

Answer:

The launched cannonball

Explanation:

Consider,

The mass of the cannonball, m

The mass of the cannon, M = 1000 m

The velocity of the cannon, V

The velocity of the cannonball, v = 100 V

The K.E of the cannon, K.E = ½ MV²

The K.E of the cannonball, k.e = ½ mv²

Substituting the values in the K.E of the cannon

½ MV² = ½ x 1000 m x (v/100² )

= ½ mv²/ 10

Therefore, ½ mv² = 10 x ½ MV²

The K.E of the cannonball is 10 times the K.E of the cannon.

Hence, the cannonball has a grater K.E

3 0

3 years ago