Rotational motion practice | Baamboozle - Baamboozle

A 600N man is playing on a seesaw with son who has a weight of 180N. If the child is sitting 2 meters away, how far will the man have to sit to balance the seesaw?

0.6 m

Where will be the center of mass of a uniform rod lies ?

At its middle point

A disc of mass 2 kg and radius 20 cm is free rotate about an axis through its centre and perpendicular to the disc. If a force of 25 N is applied tangentially to the disc, then the angular acceleration is......(Note, for a disk. I=(1/2)mr2)

125 rad/s2

A hoop of mass 0.40 kg and radius 0.60 m rotates about its central axis due to a torque of magnitude 26 N.m. What is the angular acceleration of the hoop?

180 rad/s2

Salma, who has a mass of 42 kg, and Josh, who has a mass of 45 kg, are trying to balance a seesaw. Salma's position is shown in the diagram. How far should Josh sit from the pivot point to balance Salma?

0.75 m

Which vehicle is more stable?

The black car, because it has a wide base and low center of mass.

Which figure shows the boat most stable?

lower left

Which two conditions make an object the most stable?

a low center of mass and a large base

Find the moment of inertia for A wooden hoop has a mass of 2.5 kg and a radius of 15 cm with an axis of rotation through the center. I=mr2

0.056 kg.m2

Find the moment of inertia for A piece of cardboard has a length of 32 cm, a width of 22 cm and a mass of 92 g with an axis of rotation through the center. I=(1/12) m(l2+w2)

1.3×10−3 kgm2 or 0.013 kgm2

Find the moment of inertia for A ball of modeling clay has a mass of 240 g and a diameter of 55 cm with an axis of rotation through the center. I=(2/5)mr2

2.9×10−2 kgm2 or 0.029kgm2

Find the moment of inertia for A small concrete cylinder has a mass of 25 kg and a radius of 14 cm with an axis of rotation through the center (I=(1/2)mr2)

0.25 kgm2

The figure below shows a wheel rotating about the axle. Consider, a=10.0 cm b=25.0 cm and the counterclockwise torque to be positive. Torque due to 9 N force is equal to ____

−2.25 N.m

The figure below shows a wheel rotating about the axl . Consider, a=10.0 cm b=25.0 cm and the counterclockwise torque to be positive. Torque due to 10 N force is equal to ____

−2.50 N.m

What is the torque on a bolt produced by a 15 N force exerted perpendicular to a wrench that is 25 cm long, as shown in the figure.

3.8 N.m

A bolt is to be tightened with a torque of 8.0 Nm. If you have a wrench that is 0.35 m long, what is the least amount of force you must exert?

23 N

Barbara exerts a force of 48 N on the outer edge of a door that is 76 cm wide. What is the magnitude of torque if the force is perpendicular to the door?

36 N.m