Rotational motion practice | Baamboozle - Baamboozle

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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

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

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

At its middle point

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

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

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

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

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 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

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

Which figure shows the boat most stable?

lower left

Which vehicle is more stable?

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

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

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

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 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

Which two conditions make an object the most stable?

a low center of mass and a large base