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REY [17]
4 years ago
5

What gives the gem amethyst its purplish color

Physics
1 answer:
seraphim [82]4 years ago
4 0
<span>Amethyst is a crystalline quartz, its colours range from light to dark purple. The purplish colour of amethyst is due to high energy radiations, such as gamma rays, from radioactive sources, the presence of trace elements and the presence of iron found in its crystal lattice. The colour cetre created by Fe4+ is a principal contributor to the colouring of amethyst.</span>
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Cho hai mặt cầu đồng tâm O tích điện đều. Bán kính của hai mặt cầu lần lượt là R1 và R2 (R2&gt;R1). Điện tích mặt trong là q và
Greeley [361]

Answer:

you will stc ohxoyxct txxtx xigigjjgjvvixiffjz,iffzikzfjvixii. hi h ohigiogooigoh

Explanation:

k jjvhvojvovvojivivivihvi hj

7 0
3 years ago
Two blocks of masses mA and mB are connected by a massless spring. The blocks are moved apart, stretching the spring, and subseq
WINSTONCH [101]

Answer:

Part a)

\frac{v_A}{v_B} = -\frac{m_B}{m_A}

Part b)

\frac{K_A}{K_B} = \frac{m_B}{m_A}

Explanation:

Part a)

As we know that initially the two blocks are connected by a spring and initially stretched by some amount

Since the two blocks are at rest initially so its initial momentum is zero

since there is no external force on this system so final momentum is also zero

m_Av_{1i} + m_Bv_{2i} = m_Av_A + m_Bv_B

now for initial position the speed is zero

0 = m_Av_A + m_Bv_B

now we have

\frac{v_A}{v_B} = -\frac{m_B}{m_A}

Part b)

now for ratio of kinetic energy we know that the relation between kinetic energy and momentum is given as

K = \frac{P^2}{2m}

now for the ratio of energy we have

\frac{K_A}{K_B} = \frac{P^2/2m_A}{P^2/2m_B}

since we know that momentum of two blocks are equal in magnitude so we have

now we have

\frac{K_A}{K_B} = \frac{m_B}{m_A}

7 0
3 years ago
How much force is required to accelerate a 0.10 gram mosquito at 20m/?
EastWind [94]

Answer:  0.002 newtons

===================================================

Work Shown:

I'm assuming you meant to write "at 20 m/s^2" at the end. If so, then,

0.10 grams = 0.10/1000 = 0.0001 kg

m = 0.0001 kg = mass

a = 20 m/s^2 = acceleration

F = ma .... newton's second law

F = 0.0001*20

F = 0.002

The force required is 0.002 newtons

8 0
3 years ago
Read 2 more answers
Why don't you hear a sound when you move your hand back and fourth through the air
inessss [21]
Your hand is not capable of moving fast enough for sound to come out of it.
3 0
4 years ago
Read 2 more answers
Constructive and destructive interference of vibrational waves on an aircraft can create a range of effects from a slight tail f
horrorfan [7]

Answer:

A. True

Explanation:

This is because these aircraft experiences different types of vibrations which include buffet vibrations and aerodynamic flutter. Buffet vibrations are vibrations caused by an interruption of airflow. Buffet vibrations are usually felt when the aerodynamic brakes are applied.

Aeroelastic flutter is the most dangerous type of vibration. This occurs when energy added to the wings due to airflow is greater than that lost due to damping. Aeroelastic flutter can cause aircraft to fail when the vibrations are large enough.

3 0
3 years ago
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