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
defon
3 years ago
9

Why does a plastic comb attract small bits of paper after rubbing with wool?

Physics
1 answer:
navik [9.2K]3 years ago
5 0
Static electricity. Like the balloon against hair
You might be interested in
If someone has a special rank in brainly how do you feel
Aliun [14]

Answer:

Explanation:tbh I wouldn’t care

3 0
2 years ago
Read 2 more answers
Approximately how many kelvins are equal to 60°f? <br> a. 333 <br> b. 323 <br> c. 413 <br> d. 289
Afina-wow [57]
D. 289
Take the formula:
K=5/9(Fahrenheit-32)+273
Plug in Fahrenheit
K=5/9 (60-32)+273
From here it is simple math and you can plug it into your calculator getting 288.5555556 and round to 289
3 0
3 years ago
Read 2 more answers
What statement best explains their findings? A) The downward force of gravity is less on the notecard because it has less mass.
inysia [295]

Answer:

C) The upward force of air resistance is greater with the note card causing it to reach the ground slower.

3 0
3 years ago
What is a car doing as it rounds a curve
andriy [413]

Answer:

its direction is changing

4 0
2 years ago
A reasonable estimate of the moment of inertia of an ice skater spinning with her arms at her sides can be made by modeling most
Oxana [17]

Answer:

A)  I_{total} = 1.44 kg m², B) moment of inertia must increase

Explanation:

The moment of inertia is defined by

     I = ∫ r² dm

For figures with symmetry it is tabulated, in the case of a cylinder the moment of inertia with respect to a vertical axis is

      I = ½ m R²

A very useful theorem is the parallel axis theorem that states that the moment of inertia with respect to another axis parallel to the center of mass is

    I = I_{cm} + m D²

Let's apply these equations to our case

The moment of inertia is a scalar quantity, so we can add the moment of inertia of the body and both arms

      I_{total}=I_{body} + 2 I_{arm}

       I_{body} = ½ M R²

The total mass is 64 kg, 1/8 corresponds to the arms and the rest to the body

       M = 7/8 m total

       M = 7/8 64

       M = 56 kg

The mass of the arms is

      m’= 1/8 m total

      m’= 1/8 64

      m’= 8 kg

As it has two arms the mass of each arm is half

     m = ½ m ’

     m = 4 kg

The arms are very thin, we will approximate them as a particle

    I_{arm} = M D²

Let's write the equation

     I_{total} = ½ M R² + 2 (m D²)

Let's calculate

    I_{total} = ½ 56 0.20² + 2 4 0.20²

    I_{total} = 1.12 + 0.32

    I_{total} = 1.44 kg m²

b) if you separate the arms from the body, the distance D increases quadratically, so the moment of inertia must increase

6 0
3 years ago
Other questions:
  • Twoâ cars, 405 kilometersâ apart, begin driving toward each other on aâ long, straight highway. one car travels 70 kilometers pe
    12·1 answer
  • Determine the heat energy required to vaporize 13.9 grams of liquid water at 100° C. O 2,006 cal O 47.8 cal O 7,506 cal O 24.9 c
    12·1 answer
  • Which best explains why the pencil seems bent?
    10·1 answer
  • The fastest propeller-driven aircraft is the Russian TU-95/142, which canreach a maximum speed of 925 km/h. For this speed, calc
    12·1 answer
  • Why is it beneficial to perform focal point of a convex lens exercises in a dimly-lit room?
    8·1 answer
  • What does classify mean
    14·2 answers
  • Describe how the potential energy changes
    8·2 answers
  • The pressure in car tires is often measured in pounds per square inch (lb/in.2lb/in.2), with the recommended pressure being in t
    12·1 answer
  • Now you will focus on a second hypothesis. This hypothesis can be very similar to the first, but this time you want to focus onl
    9·2 answers
  • What do you mean by Potential energy.? <br><br>➢ No Palgarized content! <br><br>Thanks :D​
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!