Torque

Torque is given by

• $τ⃗=F⃗xr⃗$

• $τ⃗=F⃗xr⃗$

• $τ⃗=(r)⃗.F⃗$

• $τ⃗=F⃗.r⃗$

Torque is maximum when angle between andis

• 0⁰

• 45⁰

• 60⁰

• 90⁰

If Torque = ma r^b/s^c M is for mass r is for radius s is for second what will the values of a, b,c respectively

• a=1, b=1, c=1

• a=1, b=2, c=3

• a=1, b=2, c=1

• a=1, b=2, c=2

If the axis of rotation passes through the body itself, the corresponding rotatory motion is called the

• Orbital motion

• Spin motion

• Vibratory motion

• To-and-fro motion

The first condition of equilibrium is

• ∑ F _x=0

• ∑ F _y=0

• ∑ F _x=∑ F _y=0

• ∑ τ=0

Clockwise torque is taken as

• Zero

• Constant

• Positive

• Negative

The centre of mass of a sphere is

• At its surface

• Centre of sphere

• Mid point of axis

• None of these

The body will be in complete equilibrium if

• First condition is satisfied only

• Second condition is satisfied only

• Both conditions will be satisfied

• None of above condition would satisfy

A constant torque acting on a uniform circular wheel changes its angular momentum from A to 5A in 3 seconds. The magnitude of this torque is

• A

• 4A

• 12A

• 4A/3

What is the unit of angular momentum?

• kg m/s

• kg m/s²

• kg m²/s

• kg m²/s²