Circular Motion

Which of the following relations is incorrect in circular motion?

• ω⊥v

• ω⊥α

• ω⊥a

• v⊥a

Flywheel starts rotating from rest with a uniform angular acceleration of 5 rad/s^2. What is the angular displacement of the flywheel in the 4th second?

• 2.8 rad

• 7.6 rad

• 11.5 rad

• 17.5 rad

The angular velocity of a particle rotating in a circular orbit 100 times per minute is

• 1.66 rad/s

• 10.47 rad /s

• 10.47 deg /s

• 60 deg /s

Particle P is moving in a circle of radius 'a' with uniform speed v. C is the center of circle & AP its diameter. Angular velocity of P about A & C

• 1: 2

• 2: 1

• 1: 1

• 4: 1

A body is rotating clockwise with decreasing angular velocity. Its angular acceleration is directed

• Along the tangent to the circle

• Along the radius

• Into the plane of the paper

• Out of the plane of the paper

The ratio of angular speeds of the minute hand and hour hand of a watch is

• 1: 1 2

• 12: 1

• 1: 6

• 6: 1

A rotating wheel of radius 0.5 m has an angular velocity of 5 rad/s at some instant and 10 rad/s after 5 s. Find its angular acceleration

• 1 rad/s^2

• 2 rad/s^2

• 10 rad/s^2

• 20 rad/s^2

A car is traveling on a circular road of radius 500 m. At some instant, its speed is 30m/s & is inc. at the rate of 2 m/s^2. What is its acceleration?

• 0.3 m/s^2

• 1.8 m/s^2

• 0.9 m/s^2

• 2.7 m/s^2

A 1000 kg truck is turning round a corner of radius of 100 m with a speed of 72 km/h, centripetal force is ___ N.

• 4

• 40

• 400

• 4000

A particle of mass 100g is tied to one end of a string of length 1m moved round in a horizontal circle. Find the tension in the string

• 4 N

• 8 N

• 12 N

• 16 N