HomeworkLib
Question

Typed answers please

Or very clear handwriting

Thanks.

P 6 A student stands on a freely rotating platform while holding a 3.00kg mass in each hand. With arms fully extended the masses are 1m from the axis of rotation and the student rotates with an angular speed of 0.750rad/s. The moment of inertia of student plus platform is 3kg.m2 and does not change much as they bring their arms in or move them out because most of their mass is in their body not their arms. However the angular velocity of the student does change when they bring their arms in close to their body. With arms in the masses the student holds in their hands are 0.3m from the rotational axis a) Find the new angular speed of the student. b) What is the final kinetic energy of the whole student, platform hand-held weights system? c) What would be the torque needed to stop the student in 2s when they have their arms in?

science   physics   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Request Professional Answer

Request Answer!

We need at least 10 more requests to produce the answer.

0 / 10 have requested this problem solution

The more requests, the faster the answer.

Request! (Login Required)

All students who have requested the answer will be notified once they are available.
Know the answer?
Add Answer to:
Typed answers please Or very clear handwriting Thanks. P 6 A student stands on a freely...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Similar Homework Help Questions

  • 1) A student sitting on a chair on a circular platform of negligible mass rotates freely...

    1) A student sitting on a chair on a circular platform of negligible mass rotates freely on an air table at initial rotational speed 2.3 rad/s. The student's arms are initially extended with 6.0-kg dumbbells in each hand. As the student pulls her arms in toward her body, the dumbbells move from a distance of 0.80 m to 0.10 m from the axis of rotation. The initial rotational inertia of the student's body (not including the dumbbells) with arms extended...

  • A student on a piano stool rotates freely with an angular speed of 3.10 rev/s. The...

    A student on a piano stool rotates freely with an angular speed of 3.10 rev/s. The student holds a 1.44-kg mass in each outstretched arm, 0.768 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.45 kgm2, a value that remains constant. As the student pulls his arms inward, his angular speed increases to 3.47 rev/s. How far are the masses from the axis of rotation at...

  • A student on a piano stool rotates freely with an angular speed of 3.05 rev/s ....

    A student on a piano stool rotates freely with an angular speed of 3.05 rev/s . The student holds a 1.35 kg mass in each outstretched arm, 0.789 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.43 kg⋅m2 , a value that remains constant. a) As the student pulls his arms inward, his angular speed increases to 3.73 rev/s . How far are the masses from...

  • student on a piano stool rotates freely with an angular speed of 2.85 rev/s . The...

    student on a piano stool rotates freely with an angular speed of 2.85 rev/s . The student holds a 1.25 kg mass in each outstretched arm, 0.739 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.53 kg⋅m2 , a value that remains constant. As the student pulls his arms inward, his angular speed increases to 3.41 rev/s . How far are the masses from the axis...

  • A student on a piano stool rotates freely with an angular speed of 3.07 rev/s. The...

    A student on a piano stool rotates freely with an angular speed of 3.07 rev/s. The student holds a 1.27-kg mass in each outstretched arm, 0.766 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.50 kg*m2, a value that remains constant. As the student pulls his arms inward, his angular speed increases to 3.40 rev/s. How far are the masses from the axis of rotation at...

  • A student sits on a freely rotating stool holding two weights, each of which has a...

    A student sits on a freely rotating stool holding two weights, each of which has a mass of 2.84kg. When his arms are extended horizontally, the weights are 0.970m from the axis of rotation and he rotates with an angular speed of 0.608rad/s. The moment of inertia of the student plus stool is 4.85kgm^2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.200m from the rotation axis. Find the new angular speed...

  • A student on a piano stool rotates freely with an angular speed of 3.05 rev/s ....

    A student on a piano stool rotates freely with an angular speed of 3.05 rev/s . The student holds a 1.45 kg mass in each outstretched arm, 0.769 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.53 kg⋅m2 , a value that remains constant. PART A) As the student pulls his arms inward, his angular speed increases to 3.78 rev/s . How far are the masses...

  • A student on a piano stool rotates freely with an angular speed of 3.11 rev/s. The...

    A student on a piano stool rotates freely with an angular speed of 3.11 rev/s. The student holds a 1.37-kg mass in each outstretched arm, 0.787 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.35 kg.m2, a value that remains constant. As the student pulls his arms inward, his angular speed increases to 3.48 rev/s. How far are the masses from the axis of rotation at...

  • 3. A student sits on a freely rotating stool holding two dumbbells, each of mass 2.92...

    3. A student sits on a freely rotating stool holding two dumbbells, each of mass 2.92 kg. When his arms are extended horizontally, the dumbbells are 0.95 m from the axis of rotation and the student rotates with an angular speed of 0.754 rad/s. The moment of inertia of the student plus stool is 2.69 kg · m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.305 m from the rotation axis....

  • A student sits on a freely rotating stool holding two dumbbells, each of mass 2.93 kg...

    A student sits on a freely rotating stool holding two dumbbells, each of mass 2.93 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 0.97 m from the axis of rotation and the student rotates with an angular speed of rad/s. The moment of inertia of the student plus stool is 2.75 kg m^2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.291 m from the...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT