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3 years ago

Which structure reduces friction between joints?

Physics

1 answer:

Roman55 [17]3 years ago

3 0

Answer:

The cartilage is the structure that reduces friction between joints.

Explanation:

Cartilage is the tissue between the bone joints. They are composed of several membranes and cellular groups. One of them called synovial membrane which provides lubricant to the edges of tissue that are touched by the bones. Reducing the friction and absorbing it so the body can move without obstacles.

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A speaker at an open-air concert emits 600 W of sound power, radiated equally in all directions.

Marina86 [1]

Answer

Given,

Sound Power, P = 600 W

a) Intensity of sound,

r = 5 m

we know,

$I = \dfrac{P}{A}$

$I = \dfrac{P}{4\pi r^2}$

$I = \dfrac{600}{4\pi\times 5^2}$

I = 1.91 W/m²

b) Sound intensity

$\beta = 10 log(\dfrac{I}{I_0})$

I₀ = 10⁻¹²

$\beta = 10 log(\dfrac{1.91}{10^{-12}})$

$\beta = 123\ dB$

c) Sound experienced by the Phil

β₁ = 123 - 23 = 100 \ dB

distance from the sound

again using sound intensity formula

$\beta = 10 log(\dfrac{I}{I_0})$

$100= 10 log(\dfrac{I}{10^{-12}})$

$I = 10^{-12}\times 10^{10}$

where, I = P/A

$\dfrac{P}{4\pi r^2} = 10^{-2}$

$r^2 = \dfrac{600}{0.04\times \pi}$

r = 69.09 m

Distance where Phil will experience same sound intensity without earplug is equal to r = 69.09 m

7 0

4 years ago

Describe the relationship between a moving objects mass and its kinetic energy

swat32

Kinetic energy is the energy of mass in motion, the kinetic energy that an object has is because of it's motion.Heavier objects that are moving have more kinetic energy than lighter ones.

6 0

4 years ago

Which Newton’s law is gown below? First Second Third Pls answer

Serggg [28]

Answer:

The First law of motion

Explanation:

The firat law states that an object either remains at rest or continues to move at a constant velocety unless acted upon by an external force

5 0

3 years ago

What quantity describes how quickly you change how fast you are traveling or how quickly you change direction?

Margarita [4]

Velocity = The speed and direction that an object is moving at

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3 years ago

Example of first, second and third law of motion.

statuscvo [17]

Examples of Newton's three law of motion.

First law of motion: A rocket being launched up in the atmosphere.

Second law of motion:while riding a bicycle, a bicycle acts as a mass and our legs pushing on the pedals of the bicycle is the force.

Third law of motion:when we jump off from the boat,the boat moves backward.

Hope,it will helpyouu!

4 0

3 years ago