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olga55 [171]
3 years ago
6

A spherical drop of water carrying a charge of 42 pC has a potential of 620 V at its surface (with V = 0 at infinity). (a) What

is the radius of the drop?
Physics
1 answer:
iren [92.7K]3 years ago
3 0

Answer:

0.0006091222 m

Explanation:

q = Charge = 42 pC

V = Voltage = 620 V

\epsilon_0 = Permittivity of free space = 8.85\times 10^{-12}\ F/m

Electric potential is given by (at r = R)

V=\dfrac{q}{4\pi\epsilon R}\\\Rightarrow R=\dfrac{q}{4\pi\epsilon V}\\\Rightarrow R=\dfrac{42\times 10^{-12}}{4\pi\times 8.85\times 10^{-12}\times 620}\\\Rightarrow R=0.0006091222\ m

The radius of the drop is 0.0006091222 m

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Billy Bob and Bob Bob are standing on a plank that is 9.0 m long and has mass 100 kg, that has supports at the 2 m and 5 m marks
Liono4ka [1.6K]

Answer:

No he will not make it all the way

Explanation:

In the attached figure we can see the plank will turn only of the turning moment will be greater than the restoring moment.

balancing moment is created by weight of the plank which acts at the center of the plank thus we have

taking moments about the support A we have

Balancing moment = M_{balancing}=100\times 2.5\times 9.81=2452.5Nm

The disturbing moment created by bob equals

M_{disturbing 1}=50\times 2\times 9.81=981Nm

The maximum disturbing moment created by bob occurs when he is at the far left side equaling

M_{disturbing 2}=90\times 2\times 9.81=1765.8Nm

Thus the maximum disturbing moment is sum of the above 2 moments

M_{max}=1765.8+981=2746.8Nm which is highly greater than the stabling  moment thus he will not make it.

7 0
3 years ago
Question 3
Yuki888 [10]

Answer:

Power = 2.5kW

Explanation:

Given

Mass = 200kg -- mass of tub

Energy = 200,000J

Time = 80s

Required

Determine the amount of power needed

Power is calculated as thus:

Power = \frac{Energy}{Time}

Substitute values for Energy and Time

Power = \frac{200,000J}{80s}

Power = 2500W

Divide by 1000 to convert to kW (kilowatt)

Power = 2.5kW

4 0
2 years ago
A right triangle has sides measuring 5 and 12 inches. If the two vectors have a magnitude of 5 and 12 and are at right angles to
ollegr [7]

Answer:

x=13

Explanation:

From the question we are told that

Magnitude 1 M_1=5

Magnitude 1 M_2=12

Generally the Pythagoras equation for the magnitudes is mathematically given as

\sqrt{x^2}=\sqrt{M_1^2 +M_2^2}

\sqrt{x^2}=\sqrt{5^2 +12^2}

x=13

Therefore resultant magnitude is

x=13

8 0
3 years ago
Peter notices that his eight-year-old daughter frequently mentions the unusual habits of a new boy, who is from a different cult
pickupchik [31]
The answer should be C. Encourage his daughter to make friends with the new boy.

Hope this helps and have a happy new year
6 0
3 years ago
Set local ground level to 700 ft, and record the inches of mercury.
Katen [24]

The altimeter reading is 29.17 from the Kollsman window is 29.17 in Hg

<h3>How to determine the altimeter reading?</h3>

The given parameters are:

  • Ground level = 700 ft i.e. the field elevation
  • Pressure altitude = 1450 ft

The pressure altitude is calculated as:

Altitude = (29.92 – Altimeter reading) * 1,000 + Ground level

Substitute the known values

1450 = (29.92 - Altimeter reading) * 1000 + 700

Subtract 700 from both sides

750 = (29.92 - Altimeter reading) * 1000

Divide through by 1000

0.75 = 29.92 - Altimeter reading

Evaluate the like terms

Altimeter reading = 29.17

Hence, the altimeter reading is 29.17 from the Kollsman window is 29.17 in Hg

Read more about pressure at:

brainly.com/question/26040104

#SPJ1

4 0
2 years ago
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