Rotational motion , torque

Two bodies A and B initially,at rest, move towardseach otherunder mutual force of attraction.At the instant when the speed of A is v and that of B is 2v, the speed of the centre of mass of bodies is

• 3v

• 2v

• v

• 0

Tags

NGSS.HS-PS2-2

Which one is a vector quantity?

• energy

• torque

• both of these

• none of these

Tags

NGSS.HS-PS2-2

NGSS.HS-PS2-4

NGSS.HS-PS3-5

If F is force and r is the radius vector, then torque is given by

• r x F

• r.F

• F x r

• none of these

A wheel starting from rest is rotating with a constant angular acceleration of 3rad/s². What is its angular acceleration after 4s?

• 25rad

• 24rad

• 12rad

• 22rad

Condition for maximum torque is

• $\theta$ = 90 degree

• $\theta$ =180 degree

• $\theta$ = 0 degree

• not defined

Torque depends on

• force

• moment arm

• mass

• force and moment arm

Along which a force act

• line of action of force

• line of acting torque

• axis of rotation

• moment arm

moment arm is

• parallel distance

• perpendicular distance

• normal distance

• resultant force

How much force would Joe have to apply perpendicular to create 550 Nm of torque 0.20 meters away from the bolt he is trying to loosen?

• 2250N

• 1250N

• 2750N

• 1550N

Unit of torque is

• Nm

• J

• N/m

• Watt