Rotational dynamics

What is the value of 1RPM (revolution per minute)?

• 0.451 rad/sec

• 0.324 rad /sec

• o.104 rad /sec

• 0.204 rad/sec

1 revolution is

• 3.14 radians

• 9.28 radians

• 2.18 radian

• 6.28 radians

A washing machine spin dries clothes. It starts spinning at 20 rad/s and slows down to 8 rad/s while turning through 500 revolutions. a. What is the angular acceleration?

• 0.34 rad/sec²

• 0.43 rad/sec²

• 0.28 rad/sec²

• 0.14 rad/sec²

what is the angular velocity of the hour hand of a clock?

• 0.0028 RPM

• 0.0032 RPM

• 0.0026 RPM

• 0.0014 RPM

Moment of Inertia of an object is given by

• I = MR²

• I = MR³

• I = MR

• I= 1/2 MR²

If linear force is equivalent to Torque in rotational dynamics what is mass equivalent to ?

• angular velocity

• angular displacement

• Inertia

• moment of inertia

How long will it take for a helicopter blade to turn through 200 radians if its angular velocity is 60 rad/s?

• 3.3 secs

• 2.2 secs

• 4.5 secs

• 2.8 secs

Angular momentum of a system remains conserved provided there is no external -------------------- acting on the system.

Which is greater 45 RPM or 4.71 rad/s?

• 45 RPM

• 4.71 RAD/S

• BOTH ARE SAME

• NOT POSSIBLE TO CALCULATE

From the conservation of angular momentum if the moment of inertia of an object increases it's angular velocity -------------------

• remains the same

• decreases

• increases

• doubles