1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bonufazy [111]
3 years ago
5

A 5 kgkg sphere having a charge of ++ 8 μCμC is placed on a scale, which measures its weight in newtons. A second sphere having

a charge of −− 3 μCμC is positioned directly above the first sphere. The distance between the two spheres is 0.3 mm . Part A What is the reading on the scale? Express your answer in newtons to three significant figures.
Physics
1 answer:
Mrac [35]3 years ago
6 0

Answer:

 F_Balance = 46.6 N    ,m' = 4,755 kg

Explanation:

In this exercise, when the sphere is placed on the balance, it indicates the weight of the sphere, when another sphere of opposite charge is placed, they are attracted so that the balance reading decreases, resulting in

          ∑ F = 0

          Fe –W + F_Balance = 0

         F_Balance = - Fe + W

           

The electric force is given by Coulomb's law

          Fe = k q₁ q₂ / r₂

The weight is

          W = mg

Let's replace

           F_Balance = mg - k q₁q₂ / r₂

Let's reduce the magnitudes to the SI system

          q₁ = + 8 μC = +8 10⁻⁶ C

          q₂ = - 3 μC = - 3 10⁻⁶ C

          r = 0.3 m = 0.3 m

Let's calculate

         F_Balance = 5 9.8 - 8.99 10⁹  8 10⁻⁶ 3 10⁻⁶ / (0.3)²

         F_Balance = 49 - 2,397

         F_Balance = 46.6 N

This is the balance reading, if it is calibrated in kg, it must be divided by the value of the gravity acceleration.

Mass reading is

          m' = F_Balance / g

          m' = 46.6 /9.8

          m' = 4,755 kg

You might be interested in
Adults with Down syndrome can often find work because they have received _____.
IrinaK [193]

Answer:

education and job training

4 0
3 years ago
Read 2 more answers
Good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
Gekata [30.6K]
Drinking Water - Direct
Our Eating Habits - Direct
Washing Clothes - Indirect
4 0
2 years ago
Read 2 more answers
A particle in uniform circular motion requires a net force acting in what direction?
mel-nik [20]
The net force will point towards the acceleration of the object, as supported by Newton's second law.
6 0
4 years ago
A boat travels north across a river at a velocity of 22 meters/second with respect to the water. The river's velocity is 2.2 met
MArishka [77]
The magnitude of the resultant is

         √ (22² + 2.2²)  =  √ (484 + 4.84)  =  √488.84  =  22.11 m/s .

The direction of the resultant is

         tan⁻¹(22N / 2.2E)  =  tan⁻¹(10)  =  5.71° east of north .
7 0
3 years ago
3m/s for 12 seconds how dar would he walk
Sunny_sXe [5.5K]
I think 36m/12s because 3×12 =36
4 0
3 years ago
Other questions:
  • A baseball player catches a ball that has a mass of .25 kg that was traveling at 40 m/s. The ball came to stop in her baseball g
    12·1 answer
  • A 10.0 cm object is 5.0 cm from a concave mirror that has a focal length of 12 cm. What is the distance between the image and th
    9·2 answers
  • Relate RNA to translation and transcription
    14·1 answer
  • How a diode can act as a capacitor?
    6·1 answer
  • A pesticide kills insects by disabling the ribosomes in their cells.
    9·2 answers
  • A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge?
    6·1 answer
  • What is a mixture?
    13·2 answers
  • Natalie enjoys talking to people and helping them with their problems. Her friends ways tell her that's she's a good listener. B
    6·1 answer
  • In order to go in a circle at a constant speed an object needs
    13·1 answer
  • What does the model show?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!