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3 years ago

Explain how the absorption of sound waves differs from the transmission of sound waves.

Physics

1 answer:

mrs_skeptik [129]3 years ago

3 0

Explanation : the difference between absorption and transmission of the sound wave

Absorption of the sound wave : sound absorption when the sound wave hit the surface of a room then the some part of the sound energy will reflect back in to the room and some parts penetrates the surface.

some parts of the sound wave energy are absorbed by converting to heat energy in the material.

Transmission of sound wave : when the sound wave propagate from the source through the medium without reflection and absorption this is called transmission .

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A girl is sitting in a sled sliding horizontally along some snow (there is friction present).

Naddika [18.5K]

Answer:

159 N

Explanation:

The force of friction is a resistive force that acts against an object in motion (or on the verge of moving).

There are two types of force of friction:

Force of static friction: it occurs when the object is still at rest
Force of kinetic friction: it occurs when the object is sliding on a surface and it is in motion

In this problem, we are in the 2nd situation, so we want to calculate the force of kinetic friction.

This force is given by:

$F=\mu_k N$

where

$\mu_k$ is the coefficient of kinetic friction

N is the normal force exerted on the object

For the sled and the girl in this problem,

$\mu_K = 0.25$ is the coefficient of kinetic friction

N = 636 N is the normal force

So the force of friction is

$F=(0.25)(636)=159 N$

8 0

3 years ago

Saturated water vapor at 200 kPa is condensed into a saturated liquid via a constant-pressure process inside of a piston-cylinde

evablogger [386]

Answer:

The process is not possible

Explanation:

if we want to determine if the process is possible , we can check with the second law of thermodynamics

ΔS≥ ∫dQ/T

for a constant temperature process ( condensation)

ΔS≥ 1/T ∫dQ

and from the first law of thermodynamics

ΔH = Q - ∫VdP , but P=constant → dP=0 → ∫VdP=0

Q=ΔH

then

ΔS≥ΔH/T

from steam tables

at P= constant = 200 Kpa → T= 120°C = 393 K

at P= constant → H vapor = 2201.5 kJ/kg , H liquid = 1.5302 kJ/kg

, S vapor= 7.1269 kJ/kg , S liquid 1.7022 kJ/kg

therefore

ΔH = H vapor - H liquid = 2201.5 kJ/kg - 1.5302 kJ/kg = 2199.9698 kJ/kg

ΔS = S vapor - S liquid = 7.1269 kJ/kg - 1.7022 kJ/kg = 5.4247 kJ/kg

therefore since

ΔS required = ΔH/T = 2199.9698 kJ/kg/(393 K)= 5.597 kJ/kg K

and

ΔS= 5.4247 kJ/kg ≤ ΔS required=5.597 kJ/kg K

the process is not possible

5 0

3 years ago

Write extensively on expansion of liquid and water . I will mark brainliest answer

kenny6666 [7]

Answer:

Water expands when it freezes making it less dense than the water from which it freezes. In fact, its volume is a little over 9% greater (or density ca. 9% lower) than in the liquid state. For this reason, ice floats on the water (like an ice cube in a glass of water).

Explanation:

5 0

3 years ago

Consider a frictionless track as

Readme [11.4K]

The maximum height to which block 1 rises after the collision is 0.56m

<h3>What is mechanical energy?</h3>

The mechanical energy is the sum of kinetic energy and the potential energy of an object at any instant of time.

M.E = KE +PE

A block of mass m1 = 5.00kg is released from A. It makes a head-on elastic collision at B with a block of mass m2= 10.0 kg that is initially at rest.

The conservation of energy principle states that total mechanical energy remains conserved in all situations where there is no external force acting on the system.

Kinetic energy before collision = Potential energy after collision

1/2 mu² =mgh

The velocity at the bottom, when the height h = 5m, is

u= √2gh

u = √2x 9.81 x5

u = 9.9 m/s

For elastic head on collision, final velocity of block 1 after collision is

v₁ = (m₁ -m₂)/ (m₁ +m₂) x u

Putting the values, we get

v₁ = -3.3 m/s

The final velocity of block 2 after collision is

v₂ = 2m₁ / (m₁ +m₂) x u

Putting the values, we get

v₂ =6.6 m/s

For block 1, after collision kinetic energy is converted to potential energy, then the maximum height rises

h' = v₁²/2g

h' = (-3.3)²/(2x9.81)

h' = 0.56 m

Thus, the height gained by the block after collision is 0.56 m.

Learn more about mechanical energy.

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7 0

2 years ago

The isotope of an atom containing 31 protons and 39 neutrons suddenly has two neutrons added to it. What isotope is created?

Over [174]

It's the second one I hope I'm right

4 0

3 years ago

Read 2 more answers