Physics Basic Unit#3

• all of these

The angular velocity of hour hand of mechanical watch in rad/hour is:

• π/6

• π

• 2π

• π/30

A wheel from 1 m diameter makes 60 rev/min. The linear speed of a point on its rim in m/s is

• π

• 2π

• π/2

• 3π

What is the speed of the tip of second’s hand of a clock if its length is 10 cm

• 1.05 cms^-1

• 1.05 m/s

• 2.05 cms^-1

• 3.05 cms^-1

A particle of rigid body is at a distance 0.1 m from axis of rotation to rotate with linear speed 3 m/s. What is angular speed of the rigid body

• 0.3 rad/s

• 3 rads^-1

• 30 rads^-1

• 1.5 rad/s

Which of given is correct formula of centripetal force

• 

A car of mass 1000 kg is moving with speed 72 km/h in a circular track of radius 100

m. The centripetal force acting on it is

• 4 N

• 400 N

• 40 N

• 4000 N

All particles of a rigid body rotating about a fixed axis may not have same

• Speed

• Axis of rotation

• Angular displacement

• Direction of angular velocity

A body moves in a circle of radius 4 m with constant speed 8 m/s experiences centripetal force 128 N. What is the mass of body?

• 2 Kg

• 8 Kg

• 4 Kg

• 16 Kg

If a body of mass m is rotating in a circle of radius r with frequency of rotation “f” then centripetal force acting on it is