12. Rotational Kinematics
Rotational Velocity & Acceleration
11:21
Learn with other creators
Practice this topic
- Multiple Choice
Calculate the rotational velocity (in rad/s) of a clock's minute hand.
EXTRA:Calculate the rotational velocity (in rad/s) of a clock's hour hand.
1548views19rank2comments - Multiple Choice
A wheel of radius 5 m accelerates from 60 RPM to 180 RPM in 2 s. Calculate its angular acceleration.
1578views26rank3comments - Multiple ChoiceA car drives at a constant along a curve on city street with a radius of . What is the acceleration of the car?705views
- Multiple ChoiceThe dwarf planet Ceres has a radius of , a mass of , and a free fall acceleration due to gravity of . What speed will a rock have if it is orbiting Ceres, right on the surface? Ceres has no atmosphere – so there are no issues with air resistance – but assume that there are no mountains or large boulders to impede the orbit.1370views
- Textbook Question
FIGURE EX4.24 shows the angular-position-versus-time graph for a particle moving in a circle. What is the particle's angular velocity at t = 4s
960views - Textbook Question
Flywheels—rapidly rotating disks—are widely used in industry for storing energy. They are spun up slowly when extra energy is available, then decelerate quickly when needed to supply a boost of energy. A 20-cm-diameter rotor made of advanced materials can spin at 100,000 rpm. b. Suppose the rotor's angular velocity decreases by 40% over 30 s as it supplies energy. What is the magnitude of the rotor's angular acceleration? Assume that the angular acceleration is constant.
1104views - Textbook Question
The angular velocity of a process control motor is ω = ( 20 - ½ t² ) rad/s, where t is in seconds. At what time does the motor reverse direction?
621views - Textbook Question
A 25 g steel ball is attached to the top of a 24-cm-diameter vertical wheel. Starting from rest, the wheel accelerates at 470 rad/s². The ball is released after ¾ of a revolution. How high does it go above the center of the wheel?
1217views