A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually...
In the following problems highlight the key words that give information about the physics concept needed to solve the problem. List those concepts under the problem. Do not solve the problems. 1. A wrecking ball is hanging at rest from a crane when sudden the ball to fall halfway to the ground is 4.77 s. Find the time it takes for the ball to fall from rest all way to the ground. ly the cable breaks. The time it takes...
A grindstone of radius 4.0m is initially spinning with an angular speed of 8.0rad/s. The angular speed is then increased to 12rad/s over the next 4.0 seconds. Assume that the angular acceleration is constant. What is the average angular speed of the grindstone?
18. A wheel is spinning about a horizontal axis with angular speed 150 rad/s and with its angular velocity pointing east. Find the magnitude and direction of its angular velocity after an angular acceleration of 40 rad/s, pointing 64° west of north, is applied for 5.0 s.
14. A giant wind turbine generates electrical power with three blades with a diameter of 145 m, and are designed to run safely when the outer end of a blade is moving at around 10 m/s. a. The wind turbine is allowed to begin spinning from rest up to its maximum safe speed over the course of 150 seconds. If this happens at a uniform rate, what is the angular acceleration of the blades, in radians per second? b. After...
A disk is originally spinning about its center at 6 rad/s counter-clockwise. A constant angular acceleration (about its center) is applied to it and it stops spinning after 6 seconds. How many revolutions are made before it is stopped?
A wind turbine in a wind farm is being shut down for maintenance. It takes 40 s for the turbine to go from its operating angular velocity to a complete stop in which the angular velocity function is ω(t) = [(ts−1 −40.0)^2/100.0]rad/s . If the turbine is rotating counterclockwise looking into the page What is the instantaneous angular acceleration at t = 20.00 s?
An ice- skater is initially spinning at an angular speed ω = 1.35 revolutions/s with a rotational inertia Ii = 2.30 kg.m2 with her arms extended. When she pulls her arms in, her rotational inertia is reduced to If=1.05 kg.m2 . Assume no external torques act. a) Determine her initial angular speed in rad/s. (1 marks) b) Calculate her final angular speed in RPM (4 marks) c) Calculate the period of rotation when she is at her final speed (1...
The angular speed of a propeller on a boat increases with constant acceleration from 14 rad/s to 35 rad/s in 2.2 revolutions. What is the angular acceleration of the propeller?
A circular disk initially at rest experiences a uniform angular acceleration through 2 revolutions in 10 s. If angular velocity at the end if 10 s is 2.5 rad/s what was the uniform angular acceleration
An ice- skater is initially spinning at an angular speed ω = 1.35 revolutions/s with a rotational inertia Ii = 2.30 kg.m2 with her arms extended. When she pulls her arms in, her rotational inertia is reduced to If=1.05 kg.m2 . Assume no external torques act. a) Determine her initial angular speed in rad/s. (1 marks) b) Calculate her final angular speed in RPM (4 marks) c) Calculate the period of rotation when she is at her final speed (1...