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olya-2409 [2.1K]

3 years ago

15

What is the state of matter that consists of a gas-like mixture of free electrons and nucle of atoms that have been stripped of

electrons

1 answer:

monitta3 years ago

5 0

I think the answer is plasma which is a fourth state of matter.

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If you shout at a cliff wall that is 440 m away and the air temperature is at 25 °C, how long will it take before you hear your

ira [324]

The speed of sound at T=25°C is Vs=346 m/s. So the sound has to reach the cliff and return back to you so the path it needs to travel is s=2*440 m = 880 m.
Since the speed of sound is constant s=Vs*t, and t= s/Vs=880/346=2.54335 s. You will hear the echo after t=2.54335 s after you shouted.

7 0

2 years ago

The two masses in the Atwood's machine shown in the figure are initially at rest at the same height. After they are released, th

Inga [223]

According to the description given in the photo, the attached figure represents the problem graphically for the Atwood machine.

To solve this problem we must apply the concept related to the conservation of energy theorem.

PART A ) For energy conservation the initial kinetic and potential energy will be the same as the final kinetic and potential energy, so

$E_i = E_f$

$0 = \frac{1}{2} (m_1+m_2)v_f^2-m_2gh+m_1gh$

$v_f = \sqrt{2gh(\frac{m_2-m_1}{m_1+m_2})}$

PART B) Replacing the values given as,

$h= 1.7m\\m_1 = 3.5kg\\m_2 = 4.3kg \\g = 9.8m/s^2 \\$

$v_f = \sqrt{2gh(\frac{m_2-m_1}{m_1+m_2})}$

$v_f = \sqrt{2(9.8)(1.7)(\frac{4.3-3.5}{3.5+4.3})}$

$v_f = 1.8486m/s$

Therefore the speed of the masses would be 1.8486m/s

6 0

3 years ago

Will mark Brainliest!

DENIUS [597]

I think it’s A protons .. hope this helps

8 0

2 years ago

Read 2 more answers

Astronomers use a special kind of instrument called a spectrometer to analyze stars. Spectrometers can determine what stars are

marshall27 [118]

The approval of the stars

4 0

2 years ago

True or False: The basketball should be dribbled below the waist.

zimovet [89]

True if you have proper stance and use your body the right way then the ball will be below your waist to allow for more control.

7 0

2 years ago