Rotational

A merry go round starts from rest, and reaches an angular speed of 2 radians/second in 3 seconds. What is its angular acceleration, and through what angle does it sweep in the 3 second time interval?

• α = 3/2 rad/s²,   θ=27/4 rad

• α = 2/3 rad/s², θ=3 rad

• α = 2/3 rad/s², θ=6 rad

• α = 6 rad/s², θ=27 rad

• - 8 rad/s²
• + 8 rad/s²
• -100 rad/s²
• -20 rad/s²

Q2. Convert the following angles to radians:

• - 100 rad

• -100π rad

• -40π rad

• -200π radians

• Clockwise and speeding up
• Counterclockwise and speeding up
• Clockwise and Slowing down
• Counterclockwise and slowing down

A fan spins with a constant angular speed of 500 radians/second. How long will it take to cover an angle of 2π radians (one revolution)?

• 0.013 s

• 0.002 s

• 76.9 s

• 6.28 s

Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• The inside horse

• The outside horse

• Neither - they both have the same angular speed

Two bugs ride a turntable which is rotating at a constant rate of 4 rad/s. Bug A is at a radius of 4 cm, while bug B is at a radius of 8 cm. What is the velocity of bug B?  

• 4 cm/s

• 32 cm/s

• 2 cm/s

• 1 cm/s

In getting the angular speed of a body, what is the relationship of the angle of rotation to the angular speed?

• directly proportional

• inversely proportional

• no relationship at all

What type of the classification of rotational motion is the figure skater performing on the Olympics?

• Circular Motion

• Spin Motion

One revolution of a circle is equivalent to 2π rad. What is its equivalent in degrees?

• 180°

• 270º

• 360º