All categories

3 years ago

Define a medium and state what type of medium sound energy would travel the fastest in

1 answer:

3 0

Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations (energy) faster. Sound travels most slowly through gases because the molecules of a gas are farthest apart.

You might be interested in

Why is air considered a fluid

34kurt

Answer:

A fluids is any substance that flows. Air is made of stuff, air particles, that are loosely held together in a gas form. Although liquids are the most commonly recognized fluids, gasses are also fluids. Since air is a gas, it flows and takes the form of its container.

Explanation:

6 0

3 years ago

Read 2 more answers

Modern human lifestyle depends on fossil fuels to generate electricity. Predict and explain the long term effect on the environm

Anit [1.1K]

Fossil fuels are non-renewable sources of energy as they are derived from pre-historic fossils and it is certain that they will deplete in the near future. 
The bigegst disadvantage of the fossil fuels is that they release carbon dioxide, nitrogen dioxide, sulfur dioxide, carbon monoxide gasses, which lead to serious environmental issues such as air pollution. They are responsible for the global warming..
Besides the environmental effect, carbon dioxide can also cause serious health complications such as chronic asthma, low lung functioning, chronic bronchitis..

3 0

3 years ago

A metal wire of resistance R is cut into eight equal pieces that are then placed together side by side to form a new cable with

Harrizon [31]

Answer:

R / 64

Explanation:

Let he length of the wire is L and its resistance is R.

The resistance of the wire is directly proportional to the length of the wire. As the wire is cut into 8 equal pieces so the resistance of small wire is R/8.

Now they are connected in parallel.

The equivalent resistance is given by

$\frac{1}{R_{eq}}= 8\times \frac{8}{R}$

$R_{eq}=\frac{R}{64}$

Thus, the equivalent resistance of the new cable is R / 64.

4 0

3 years ago

Peter left town A at 13:30 and travelled towards town B at an average speed of 40mph. At 13:45 Philip left town A for town B at

skad [1K]

Answer:

fbddb

Explanation:

dsbse

8 0

3 years ago

Una mujer de masa m está parada en el borde de una mesa giratoria horizontal de momento de inercia I y radio R. La mesa al princ

Dovator [93]

$- \frac{mR^2 }{I } \ v$ Answer:

a) w = - $\frac{m r }{I} v$ , b) W = - ½ m_woman R² (1 + m_woman R / I²) v²

Explanation:

a) To solve this exercise, let's use the conservation of angular momentum.

We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved

initial instant. Before starting to move the woman

L₀ = 0

final instant. After starting to move

L_f = I w + m v r

the moment is preserved

L₀ = L_f

0 = Iw + m v r

w = - $\frac{m r }{I} v$ (1)

the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise

b) for this part we use the relationship between work and kinetic energy

W = ΔK

in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables

v = w r

we substitute

W = 0 - ½ I_total w²

I_total = I + m_{woman} R²

W = - ½ (I + m_woman R²) ( $\frac{m_{woman} R}{I} \ v$ ) ²

W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²

W = - ½ m_woman R² (1 + m_woman R / I²) v²

3 0

3 years ago