Question

A figure skater starts from rest and begins spinning with an angular acceleration of 15 rad/s2....

A figure skater starts from rest and begins spinning with an angular acceleration of 15 rad/s2. How long will it take her to spin 8.6 radians?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Initial angular speed of skater,i=0

Angular acceleration,=15 rad/s2

Angular displacement,=8.6 rad.

According to constant rotational motion angular displacement is given by

=it+(1/2)t2=0+(1/2)t2

So

time t=(2/)1/2=(28.6/15)1/2=1.07 sec

0 0
Know the answer?
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

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A wheel starts spinning from rest at a constant angular acceleration of .04 rad/s2. Find the...
A wheel starts spinning from rest at a constant angular acceleration of .04 rad/s2. Find the time needed for the angle between the velocity vector and the net acceleration on any point on the wheel to be 76°.
1. A wheel starts from rest and has an angular acceleration of 6.00 rad/s2 . When...
1. A wheel starts from rest and has an angular acceleration of 6.00 rad/s2 . When it has made 3.00 rev its angular velocity in rad/s is: 2. A circular disk of radius 1.00 m rotates, starting from rest, with a constant angular acceleration. What is the centripetal acceleration of a point on the edge of the disk at the instant that its angular speed is 2.50 rev/s?
A bar on a hinge starts from rest and rotates with an angular acceleration α =...
A bar on a hinge starts from rest and rotates with an angular acceleration α = 15 + 8t, where α is in rad/s2 and t is in seconds. Determine the angle in radians through which the bar turns in the first 4.90 s.
A discus thrower (arm length 0.9 m) starts from rest and begins to rotate counterclockwise with...
A discus thrower (arm length 0.9 m) starts from rest and begins to rotate counterclockwise with a constant angular acceleration of +2.7 rad/s2. (a) How many radians of angle does it take for the discus thrower's angular velocity to reach +7.0 rad/s? rads (b) How long does this take? seconds At this time (from part b), please find the following quantities: (c) the linear speed of the discus: m/s (d) the size of the discus's tangential acceleration: m/s2 the size...
A merry-go-round rotates from rest with an angular acceleration of 2.00 rad/s2. How long does it...
A merry-go-round rotates from rest with an angular acceleration of 2.00 rad/s2. How long does it take to rotate through (a) the first 4.00 rev. (b) At the 4.00 rev angle the acceleration immediately changes to 1.5 rad/s2 , how long does it take to rotate the next 4.00 rev?
A helicopter propeller blade starts from rest and experiences a constant angular acceleration of 18.0 rad/s2....
A helicopter propeller blade starts from rest and experiences a constant angular acceleration of 18.0 rad/s2. Find the speed of a point on the blade 2.35 m from the axis of rotation when the blade has completed 18 revolutions.
A wheel released from rest is rotating with constant angular acceleration of 2.5 rad/s2. (a) After...
A wheel released from rest is rotating with constant angular acceleration of 2.5 rad/s2. (a) After 2.5 s, what is its angular velocity? rad/s (b) Through what angle has the wheel turned? rad (c) How many revolutions has it made? rev (d) What is the speed of a point 1.0 m from the axis of rotation? m/s What is the magnitude of the total acceleration of the same point? m/s2
A 44.0-cm diameter disk rotates with a constant angular acceleration of 3.00 rad/s2. It starts from...
A 44.0-cm diameter disk rotates with a constant angular acceleration of 3.00 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (a) At t = 2.48 s, find the angular speed of the wheel. rad/s (b) At t = 2.48 s, find the magnitude of the linear velocity...
A gyroscope flywheel of radius 2.05 cm is accelerated from rest at 14.1 rad/s2 until its...
A gyroscope flywheel of radius 2.05 cm is accelerated from rest at 14.1 rad/s2 until its angular speed is 2390 rev/min. (a) What is the tangential acceleration of a point on the rim of the flywheel during this spin-up process? (b) What is the radial acceleration of this point when the flywheel is spinning at full speed? (c) Through what distance does a point on the rim move during the spin-up?
A centrifuge takes 100 s to spin up with constant angular acceleration (α) from rest to...
A centrifuge takes 100 s to spin up with constant angular acceleration (α) from rest to its final angular speed of 1,875 (rad/s). What is the angular acceleration (in rad/s2) of the centrifuge as it spins up? (Hint: use relationship between angular velocity and angular acceleration)             (ii)       How many revolutions does the centrifuge make as it goes from rest to its final                         angular speed? (Hint: use relationship between angular displacement and                         angular acceleration, and noting that one revolution = 2 rads)...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT