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Alex787 [66]
3 years ago
13

research group uses short bursts of laser light to measure the motion of electrons moving within and among atoms. In the planeta

ry model of the atom, the hydrogen atom can be viewed as having a single electron in a circular orbit with a diameter of approximately 10-10 m. If the average speed of the electron in the orbit is known to be 2,200,000 m/s, calculate the number of revolutions per second it makes around the nucleus.
Physics
1 answer:
Leokris [45]3 years ago
3 0

Answer:

ω = 7 x 10¹⁵ rev/s

Explanation:

The linear and angular velocities are related through the following formula:

v = r\omega

where,

v = linear speed of electron = 2200000 m/s

r = radius of orbit = \frac{diameter}{2} = \frac{10^{-10}\ m}{2}  = 0.5\ x\ 10^{-10}\ m

therefore, substituting these values in the formula, we get:

2200000\ m/s = (0.5\ x\ 10^{-10}\ m)(\omega)\\\omega = \frac{2200000\ m/s}{0.5\ x\ 10^{-10}\ m} \\

ω = 4.4 x 10¹⁶ rad/s

\omega = (4.44\ x\ 10^{16}\ rad/s)\frac{1\ revolution}{2 \pi\ rad}

<u>ω = 7 x 10¹⁵ rev/s</u>

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Emmit is lifting a box vertically which forces are necessary for calculating the total force
zavuch27 [327]

Answer:

FG and FP

Explanation:

Gravitational Force(FG) because the box is being pulled down and a resistance force pushing up because he is pushing(FP) up on the box.

I hope this helps!

4 0
3 years ago
Electrical outlets in a house maintain a steady voltage, even when the amount of resistance on them changes. How is this possibl
makvit [3.9K]
The situation presented above is possible because the outlets could be operating in a parallel circuit. <span>Electrical outlets in a house maintain a steady voltage, even when the amount of resistance on them changes because it operates with a parallel circuit wherein voltage is constant even if resistance changes.</span>
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3 years ago
Which statement explains how gravity and inertia work together?
-Dominant- [34]
A. They change the motion of objects
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3 years ago
Read 2 more answers
In doing a load of clothes, a clothes drier uses 18 A of current at 240 V for 41 min. A personal computer, in contrast, uses 2.2
Tpy6a [65]

Answer:

The time taken by the personal computer to 'surf' the internet is 11.13 h.

Explanation:

The expression for the energy in terms of current and time is as follows;

E= Vit

Here, V is the potential, i is the current and t is the time.

According to question, in doing a load of clothes, a clothes drier uses 18 A of current at 240 V for 41 min.

Convert time from minute to second.

t=\frac{41}{60}s

Calculate the energy used by the clothes drier.

Put V= 240 V, t=\frac{41}{60}s and i=18 A in the expression for the energy.

E= (240)(18)\frac{41}{60}

E'= 2937.6 W

Therefore, the energy of a clothes drier is E'= 2937.6 W.

It is given in the problem that a personal computer, in contrast, uses 2.2 A of current at 120 V. With the energy used by the clothes drier, this computer is used to surf the internet.

Calculate the time taken by the computer to 'surf' the internet.

E'=V'i't'

Here, V' is the voltage used by the a personal computer, i' is the current and t' is the time taken by the personal computer.

Put E'= 2937.6 W, V= 120 V and i'= 2.2 A.

2937.6 = (120)(2.2)t'

t'=\frac{2937.6}{264}

t'= 11.13 h

Therefore, the time taken by the personal computer to 'surf' the internet is 11.13 h.

4 0
3 years ago
Planet A and planet B are in circular orbits around a distant star.
evablogger [386]

Answer:

\frac{v_A}{v_B}=0.402

Explanation:

The speed that planets must have in order for their orbit to be stable, is given by:

v=\sqrt{\frac{GM}{r}}

Here v It is called orbital speed, G is the gravitational constant, M is the mass of the star and r is the radius of the orbit. In this case we have:

r_A=6.2r_B

So, the ratio of their speed is:

\frac{v_A}{v_B}=\frac{\sqrt{\frac{GM}{r_A}}}{\sqrt{\frac{GM}{r_B}}}\\\frac{v_A}{v_B}=\sqrt{\frac{r_B}{r_A}}\\\frac{v_A}{v_B}=\sqrt{\frac{r_B}{6.2r_B}}\\\frac{v_A}{v_B}=\sqrt{\frac{1}{6.2}}\\\frac{v_A}{v_B}=0.402

8 0
3 years ago
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