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3 years ago

A substance through which a wave can travel

1 answer:

6 0

Waves can travel through matter called a medium. This is true for mechanical waves that include sound, water and slinky waves.

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why should society be concerned about continental drift and plate tectonics? What value does this research have for the public i

AleksAgata [21]

Humans should be concerned with continental drift and plate tectonics because these forces have a major impact on the environment and also lead to major natural disasters. Shifts in tectonic plates lead to earthquakes which can also cause things like typhoons or tsunamis. Therefore, begin knowledgeable about the locations of fault lines and areas with the high potential for natural disasters as a result of shifting plates is very important.

3 0

3 years ago

Read 2 more answers

The drill used by most dentists today is powered by a small air-turbine that can operate at angular speeds of 350000 {\rm rpm} .

damaskus [11]

Answer:

5833.33

Explanation:

$\alpha$ = Angular acceleration

$\theta$ = Number of revolutions

$\omega_i$ = Initial angular speed = 0

t = Time taken = 2 s

Final angular speed

$\omega_f=\dfrac{350000}{60}=5833.33\ rps$

From the equation of rotational motion we have

$\omega_f=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{\omega_f-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{5833.33-0}{2}\\\Rightarrow \alpha=2916.665\ rev/s^2$

$\theta=\omega_it+\dfrac{1}{2}\alpha t^2\\\Rightarrow \theta=0\times t+\dfrac{1}{2}\times 2916.665\times 2^2\\\Rightarrow \theta=5833.33\ rev$

The number of revolutions is 5833.33

6 0

3 years ago

What can make your computer "sick"?

Svetach [21]

Answer:

An virus

Explanation:

An computer virus can come from websites that try to steal your Information or apps that's not necessarily scanned and protected so that yor computer can be safe from viruses.

7 0

3 years ago

The 9 kg block is then released and accelerates

katrin [286]

Answer: 1458

explanation

7 0

3 years ago

A woman standing on the ground sees a rocket ship move past her at 95% the speed of light. Compared to the rocket at rest, the w

Rufina [12.5K]

As per Einstein's theory of relativity we know that when an object will move with the speed comparable to the speed of light then the length of the object will be different from its length at rest position

This is also known as length contraction theory

As we know here that

$L = L_0\sqrt{1 - \frac{v^2}{c^2}}$

so here we know that

v = 0.95 c

so from above equation we will have

$L = L_0\sqrt{1 - 0.95^2}$

$L = 0.31 L_0$

so here the length will be SHORTER

8 0

3 years ago