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
max2010maxim [7]
3 years ago
7

An ice skater spins at 2.5 rev/s when his arms are extended. He draws his arms in and spins at 10.0 rev/s. By what factor does h

is moment of inertia change in the process?
Physics
1 answer:
Rainbow [258]3 years ago
4 0

Answer:

The moment of inertia decreased by a factor of 4

Explanation:

Given;

initial angular velocity of the ice skater, ω₁ = 2.5 rev/s

final angular velocity of the  ice skater, ω₂ = 10.0 rev/s

During this process we assume that angular momentum is conserved;

I₁ω₁ = I₂ω₂

Where;

I₁ is the initial moment of inertia

I₂ is the final moment of inertia

I_2 = \frac{I_1 \omega_1}{\omega_2} = \frac{I_1*2.5}{10} \\\\I_2 = 0.25I_1 = \frac{1}{4}I_1

Therefore, the moment of inertia decreased by a factor of 4

You might be interested in
John is gardening and finds a tree root in the soil. He decides he will try to pull it out. He grabs onto it and uses a force of
Leya [2.2K]

Answer:

20 joules/sec

Explanation:

100/5=20

7 0
3 years ago
You are working with a magnet and it breaks in half. You then end up with
IRISSAK [1]

Correct Answer is D.

The other answers do not make sense. Imagine this. You break a magnet in half. All it does is become a smaller magnet.

6 0
3 years ago
Read 2 more answers
A particle with charge Q and mass M has instantaneous speed u1 when it is at a position where the electric potential is V1. At a
Mariulka [41]

Answer: A

Explanation:

4 0
2 years ago
What is the amount of heat, in calories, given off from a 5 g piece of aluminum when it cools from 80°C to 20°C? The specific he
vagabundo [1.1K]

Answer:

Q (heat) = S * m * (T2 - T1)  where Q is heat gained (loss), S the specific heat capacity of the substance and T2, T1 are the final and initial temps

Q = .215 cal  / (g deg C) * 5 g * (20 - 80) deg C = -64.5 cal

Since the question specifies the heat emitted, then  64.5 cal is the

heat emitted (loss).

8 0
3 years ago
Burning coal produces which type of gas?
Aleksandr [31]

Answer:

carbon dioxide

Explanation:

In addition to carbon dioxide, discussed below, coal plants all produce the following pollutants: Sulfur dioxide, which leads to acid rain. Coal combustion is the leading source of US sulfur dioxide emissions. Nitrogen oxides, key contributors to ground-level ozone (smog) and respiratory illnesses.

6 0
3 years ago
Read 2 more answers
Other questions:
  • A thin rod of length 1.3 m and mass 250 g is suspended freely from one end. It is pulled to one side and then allowed to swing l
    13·1 answer
  • Exercise 2.4.6: Suppose you wish to measure the friction a mass of 0.1 kg experiences as it slides along a floor (you wish to fi
    6·1 answer
  • Having Select all that apply. Personality traits may include:
    12·2 answers
  • Why, based on what you learned in the module, might an institution like a university choose to use cast, steel-reinforced concre
    11·1 answer
  • PLEASE TRY TO ANSWER AS MANY QUESTIONS AS YOU CAN !
    12·1 answer
  • What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to 14 REarth before coming t
    15·1 answer
  • A bus starts to move from rest. If it is accelerated by 0.8m/s2, calculate the velocity and distance traveled after 8 s.
    7·1 answer
  • Why is it important to have a strong core (mid section)?
    10·1 answer
  • Can anyone help me please I beg you I don’t understand I will give you Brainliest
    6·1 answer
  • A bus travels a distance of 100 km in 2.5 h. Calculate its average speed.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!