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
Vedmedyk [2.9K]
3 years ago
15

man stands on a platform that is rotating (without friction) with an angular speed of 1.2 rev/s; his arms are outstretched and h

e holds a brick in each hand.The rotational inertia of the system consisting of the man, bricks, and platform about the central vertical axis of the platform is 6.0 k g times m squared. If by moving the bricks the man decreases the rotational inertia of the system to 2.0 k g times m squared, what is the resulting angular speed of the platform in rad/s? Express to 3 sig figs.
Physics
1 answer:
-Dominant- [34]3 years ago
3 0

Answer:

w₂ = 22.6 rad/s

Explanation:

This exercise the system is formed by platform, man and bricks; For this system, when the bricks are released, the forces are internal, so the kinetic moment is conserved.

Let's write the moment two moments

initial instant. Before releasing bricks

       L₀ = I₁ w₁

final moment. After releasing the bricks

       L_{f} = I₂W₂

       L₀ = L_{f}

       I₁ w₁ = I₂ w₂

       w₂ = I₁ / I₂ w₁

let's reduce the data to the SI system

     w₁ = 1.2 rev / s (2π rad / 1rev) = 7.54 rad / s

 

 let's calculate

       w₂ = 6.0/2.0   7.54

       w₂ = 22.6 rad/s

You might be interested in
How does the behavior of oobleck change as you increase the force
SIZIF [17.4K]
Hope this helps
If u hit oobleck hard it is a solid and when you pick it up and let it fall of your hand it turns into a liquid
8 0
3 years ago
In order to compare the two thermal conductivities ,a scientist pours hot water into two beakers .
Elden [556K]

Answer:

Time domain and frequency domain

7 0
2 years ago
How you would teach the habit to your students.
dmitriy555 [2]

Answer:

Probably just enforcing it little by little. (If you mean a habit. If you mean a certain topic it's different.)

Explanation:

If you are trying to teach your students a habit-

Try to correct them everytime they don't follow it. Expect them to do so and give a reward when they earn it.

If you mean a certain topic-

Make a slideshow or a presentation with an interactive game. Making it not boring and having them more attentive.

I gave a more general answer, so if you would like to go deeper into the subject I would be more happy to.

(If this helped, please let me know. If you have any questions do not be afriad to ask!)

7 0
3 years ago
You are driving from Seattle to Portland, a distance of 174
Aliun [14]

Answer:

 driving distance = 174 miles

The distance by car is 278 km.  Follow the Seattle to Portland driving route along I-5 S.  Get driving directions from Seattle to Portland.

 flight distance = 145 miles

Explanation:

4 0
3 years ago
A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of
uysha [10]

Answer:

q = 4.04×10^-12C

n = 2.53×10^7

Explanation:

1. Electrostatic force on charge due to electrical field E is F = qE

Gravitational force due to weight of drop of mass M is F = mg, when net force is zero we have to find the charges on the drop.

2. Charge on drop: since gravitational force is acting downward, electric field is acting upward and we equate both equations.

Therefore, Fg = Fe

qe = mg

q = mg/E

q = 3.50×10^-9kg×9.8m/s²/8480N/c

q = 4.04 × 10^-12

3. Number of protons by quantitization law

n = q/e

n = 4.04× 10^-12/8480

n = 2.53× 10^7

8 0
3 years ago
Other questions:
  • The increase in the volume of 10cm³ of mecury when the temperature rises by 100°C is 0.8 cm³. What is the cubic expansivity of m
    14·2 answers
  • Which term describes the increase in a material's volume due to an increase in temperature?
    10·2 answers
  • Giant cave systems have formed through the reaction of acids with the BLANK that make up limestone
    5·2 answers
  • How can a change in technology affect scientific knowledge?
    7·1 answer
  • You would convert from grams to moles by using the ___________ of the substance.
    8·1 answer
  • Help me with number 8 please :(
    12·1 answer
  • A train is traveling north. it goes 200 km /hr for 2.5 hours how far did the train go.
    15·2 answers
  • Which is true about the way air flows
    10·1 answer
  • While John is traveling along a straight interstate
    13·1 answer
  • What do you mean by focus in science
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!