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
ICE Princess25 [194]
2 years ago
14

A force is applied to the rim of a disk that can rotate like a merry-go-round, so as to change its angular velocity. Its initial

and final angular velocities, respectively, for four situations are the following.
(a) -2 rad/s, 5 rad/s;
(b) 2 rad/s, 5 rad/s;
(c) -2 rad/s, -5 rad/s; and
(d) 2 rad/s, -5 rad/s.

Rank the situations according to the work done by the torque due to the force, greatest first.
Physics
1 answer:
frutty [35]2 years ago
8 0

Answer:

The work done by the torque is the same in each case.

Explanation:

Work-Energy Theorem can be used to calculate the work done by the torque in each case.

W = \Delta K\\W = K_2 - K_1 = \frac{1}{2}I\omega_2^2 - \frac{1}{2}I\omega_1^2\\

Let's apply this theorem to each case:

W_a = \frac{1}{2}I(5)^2 - \frac{1}{2}I(-2)^2 = \frac{1}{2}I(21)\\W_b = \frac{1}{2}I(5)^2 - \frac{1}{2}I(2)^2 = \frac{1}{2}I(21)\\W_c = \frac{1}{2}I(-5)^2 - \frac{1}{2}I(-2)^2 = \frac{1}{2}I(21)\\W_d = \frac{1}{2}I(-5)^2 - \frac{1}{2}I(2)^2 = \frac{1}{2}I(21)

As can be seen from the results, in each case the work done by the torque is the same.

You might be interested in
Scientists use specific processes to evaluate information in order to determine its accuracy and reliability. A scientist is con
solmaris [256]
The answer would be hypothesis testing
7 0
2 years ago
Read 2 more answers
¿Por qué en algunas partes el agua tiene mayor presión?
Phantasy [73]
Cuando la presión aumenta en el agua, disminuye el punto de fusión del hielo. Ósea esta a temperatura muy alta.


Espero que esto te ayude y no me haya confundido
7 0
2 years ago
A student shoots a spitball with a perfectly horizontal velocity of 9.7 m/s from a height of 1.8 meters. How long will it take f
sergejj [24]

Answer:A student shoots a spitball with a perfectly horizontal velocity of 9.7 m/s from a height of 1.8 meters. How long will it take for the spitball to hit the ground?

(ignore air resistance) (include units and correct number of significant figures)

Explanation:La respuesta es porque esa es la respuesta, la respuesta al número es 9.7 1.8 Divide =53.888

3 0
3 years ago
A book that weighs 19 Newtons sits on a table. With what force
iVinArrow [24]

Answer:

We know there's two forces acting on a book while it sits on a table:the force of gravity pulling it down, and the normal force of the table acting upward on the book. The book isn't accelerating while it sits there. That's because the weight of the book is being counteracted by the normal force of the table.

Explanation:

There are two forces acting upon the book. One force - the Earth's gravitational pull - exerts a downward force. The other force - the push of the table on the book (sometimes referred to as a normal force) - pushes upward on the book.

5 0
3 years ago
What do you call the theory that says gravitational attraction caused bits of matter to collapse, begin spinning, and eventually
Semenov [28]
The nebular hypothesis is the name of the theory where gravitational attraction caused bits of matter to collapse, eventually forming a solar system.
Hope this helps :)
7 0
2 years ago
Other questions:
  • Newton's first law of motion is also called the law of acceleration true or false
    9·1 answer
  • In an experiment if doubling the manipulated variable results in doubling of the responding variable the relationship between th
    14·1 answer
  • When a river overflows its banks, it deposits sediment over a broad, flat area of land on both sides of the river. This broad fl
    8·1 answer
  • What is the relationship between net force and balanced forces
    14·2 answers
  • Drag the tiles to the correct boxes to complete the pairs. Match each form of energy to its description. motion energy thermal e
    10·2 answers
  • A ball is thrown directly upwards. Is there a point of trajectory where the ball has zero acceleration
    6·1 answer
  • A partially inflated balloon is faded over the open end of a glass beaker that contains water the beaker is placed in an ice bat
    8·1 answer
  • You hold glider AA of mass 0.125 kgkg and glider BB of mass 0.375 kgkg at rest on an air track with a compressed spring of negli
    12·1 answer
  • What does it mean when the orbital eccentricity of a planet is close to 1?
    12·2 answers
  • Help on 9 and 10!!!!!! I’ll give 5 starts
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!