Study Guide 2 - Rotational Kinematics Review

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

A gear spins at a rate of 400 revolutions/minute. Which choice is closest to its angular speed in radians/second?

• 6.67 rad/s

• 2500 rad/s

• 41.9 rad/s

• 20.9 rad/s

A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?

• 9.6 rad/s²

• 1.6 rad/s²

• 4.3 rad/s²

• 6.2 rad/s²

2600 rev/min is equivalent to which of the following?

• 2600 rad/s

• 43.3 rad/s

• 273 rad/s

• 60 rad/s

What's the centripetal acceleration of a .2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

 $HINT:\ a_c=\frac{v^2}{r}$  

• 8.23 m/s²

• 10.54 m/s²

• 12.86 m/s²

• 17.39 m/s²

What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

• 5 m/s²

• 17.63 m/s²

• 10 m/s²

• 8.81 m/s²

Tags

NGSS.HS-PS2-1

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it

• continues to follow a circular path, but with a radius larger than the original radius.

• moves along a straight-line path toward the center of the circle.

• moves along a straight-line path away from the center of the circle

• moves along a straight-line path in its original direction.

When an object moves in uniform circular motion, the direction of its acceleration is

• in the same direction as its velocity vector.
• is directed toward the center of its circular path.
• in the opposite direction of its velocity vector.
• depends on the speed of the object.

1 revolution = _____________ radians.

• Pi

• 1

• 2Pi

• 360

Rotational Motion is motion ____________________________.

• in a straight line

• in the opposite direction

• around a fixed point in space

• that never stops.