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3 years ago

How does sound travel through a medium PLZ HURRY WILL GIVE BRAINLY

2 answers:

5 0

sound travels through a medium in mechanical waves a mechanical wave is a disturbance that moves and transports energy from one place to another through a medium

denis-greek [22]3 years ago

4 0

MARK AS BRAINLTIST PLZZ

The brain interprets these vibrations as sounds. ... The speed of a sound wave depends upon the medium through which it travels. In general, sound travels faster through solids than through liquids or gases. Also, the denser the medium, the slower sound will travel through it.

:) HOPE THIS HELPS

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A battery of voltage V delivers power P to a resistor of resistance R connected to it. By what factor will the power delivered t

Anettt [7]

Answer:

Explanation:

Power P = V² / R

a ) The resistance is changed to 2.90R

Power will become 1 / 2.9 times .

b )The voltage of the battery is now 2.90V, but the resistance is R

P = (2.9V)² / R

= 8.41 x V² / R

So power becomes 8.41 times

c )The resistance is 2.90R and voltage is 2.90V

Power P = (2.9V)² / 2.9 R

= 2.9 V²/R

So power becomes 2.9 times

d ) The resistance is 2.90R and the voltage is V/2.90

Power P = ( V/2.90)² x 1 / 2.90R

1 / ( 2.9 )³ x V² / R

= 1 / 24.389 x V² / R

So power becomes 1 / 24.389 times .

4 0

3 years ago

A 62.0-kg skier is moving at 6.10 m/s on a frictionless, horizontal, snow-covered plateau when she encounters a rough patch 4.10

7nadin3 [17]

b) 747.3 J

a) 7.88 m/s

Explanation:

We start by solving part b) first.

The internal energy generated when crossing the rough patch is equal (in magnitude) to the work done by the friction force on the skier.

The magnitude of the friction force is:

$F_f=\mu mg$

where:

$\mu=0.300$ is the coefficient of friction

m = 62.0 kg is the mass of the skier

$g=9.8 m/s^2$ is the acceleration due to gravity

Therefore, the work done by friction is:

$W=-F_f d =-\mu mg d$

where

d = 4.10 m is the length of the rough patch

The negative sign is due to the fact that the friction force is opposite to the direction of motion of the skier

Substituting,

$W=-(0.300)(62.0)(9.8)(4.10)=-747.3 J$

So, the internal energy generated in crossing the rough patch is 747.3 J.

If we take the bottom of the hill as reference level, the initial mechanical energy of the skier is sum of his kinetic energy + potential energy:

$E=K_i +U_i = \frac{1}{2}mu^2 + mgh$

where

m = 62.0 kg is the mass

u = 6.10 m/s is the initial speed

h = 2.50 m is the height of the hill

After crossing the rough patch, the new mechanical energy is

$E'=E+W$

where

W = -747.3 J is the work done by friction

At the bottom of the hill, the final energy is just kinetic energy,

$E' = K_f = \frac{1}{2}mv^2$

where v is the final speed.

According to the law of conservation of energy, we can write:

$E+W=E'$

So we find v:

$\frac{1}{2}mu^2 +mgh+W = \frac{1}{2}mv^2\\v=\sqrt{u^2+2gh+\frac{2W}{m}}=\sqrt{6.10^2+2(9.8)(2.50)+\frac{2(-747.3)}{62.0}}=7.88 m/s$

8 0

3 years ago

If I was born in 1998 how old will I be

brilliants [131]

Answer:

If your birthday was celebrated already then you would be 23, but if your birthday isn't celebrated then you would be 22

Explanation:

6 0

3 years ago

The charge on the square plates of a parallel-plate capacitor is Q. The potential across the plates is maintained with constant

lesantik [10]

Answer:

i) Q' = Q/2.

ii) If the wires to the battery are disconnected, the amount of charge on the plates remains constant, and the voltage across the plates remains the same.

Explanation:

i) The formula for capacitance is given as

C = A/d

Where d = separation between the plates

The formula for the charge stored is given as

Q = CV

Q = AV/d

When "d" is doubled, the charge stored "Q" becomes half because Q is inversely proportional to the separation between the plates, d.

Thus, Q' = Q/2.

ii) If the wires to the battery are disconnected, the amount of charge on the plates remains constant, and the voltage across the plates remains the same.

8 0

4 years ago

the main difference between batholiths and stocks is that stocks are formed deeper in Earth’s surface

11Alexandr11 [23.1K]

<span>A batholith is an exposed area of rock that covers an area larger than 100 square kilometers. Areas smaller than 100 square kilometers are called stocks.</span>

3 0

3 years ago