ROTATIONAL MOTION OF RIGID BODY

Convert 10 rev s^-1 into rad s^-1

• $20\pi\ rad\ \ s^{-1}$

• $40\pi\ rad\ \ s^{-1}$

• $30\pi\ rad\ \ s^{-1}$

• $10\pi\ rad\ \ s^{-1}$

A gymnast on a high bar swings through two revolutions in

a time of 2.50 s. Find the average angular velocity (in rev/s)

of the gymnast.

• $0.8\ rev\ s^{-1}$

• $5\ rev\ s^{-1}$

• $1.25\ rev\ s^{-1}$

• $0.33\ rev\ s^{-1}$

An airplane blades are rotating with an angular velocity of 110

rad/s. As the plane takes off, the angular velocity of the

blades reaches 330 rad/s in a time of 14 s. Find the

average angular acceleration.

• $20.3\ rad\ s^{-1}$

• $15.71\ rad\ s^{-1}$

• $2.31\ rad\ s^{-1}$

• $6.32\ rad\ s^{-1}$

A fan blade with radius 0.6 m has an angular speed of 6.50 rad/s. Calculate its linear speed.

• 10.83 ms^-1

• 0.09 ms^-1

• 3.9 ms^-1

• 17.32 ms^-1

Helicopter blade has a radius of 7 m and

has an angular acceleration of 1.30 rad s^-2 . Calculate its tangential acceleration.

• 23.33 ms^-2

• 0.04 ms^-2

• 1.32 ms^-2

• 9.1 ms^-2

 $1\ revolution\ =\ 2\pi\ rad$  

A fan with radius of 1.5 m, rotates for 3 revolution. Calculate the displacement (arc length) for the rotational motion.

• 4.5 m

• 28.27 m

• 12.57 m

• 0.08 m

A spinning top rotates at radius of 0.2 m and have an angular velocity of 1.2 rad s^-1. Calculate its centripetal acceleration.

• 29 rad s^-2

• 2.9 rad s^-2

• 0.24 rad s^-2

• 0.29 rad s^-2

 $\omega\ =\ \omega_o\ +\propto t$  Which rotational motion equation is similar with linear motion equation ?

•  $v\ =\ u\ +\ at$  

•  $s\ =\ ut\ +\ \frac{1}{2}at^2$  

•  $v^2\ =\ u^2\ +\ 2as$  

•  $v\ =\ u\ +\ \propto t$  

 $\theta\ =\ \omega_ot\ +\ \frac{1}{2}\propto t^2$  Which rotational motion equation is similar with linear motion equation ?

•  $v\ =\ u\ +\ at$  

•  $s\ =\ ut\ +\ \frac{1}{2}at^2$  

•  $v^2\ =\ u^2\ +\ 2as$  

•  $v\ =\ u\ +\ \propto t$  

 $\omega^2\ =\ \omega_o^2\ \ +\ 2\propto\theta$  Which rotational motion equation is similar with linear motion equation ?

•  $v\ =\ u\ +\ at$  

•  $s\ =\ ut\ +\ \frac{1}{2}at^2$  

•  $v^2\ =\ u^2\ +\ 2as$  

•  $v\ =\ u\ +\ \propto t$