Which of the following are in equilibrium Choose all that ap

Which of the following are in equilibrium? Choose all that apply. A disc that has a constant velocity and is spinning up. A baseball that is at rest and is spinning up. A turntable that has a constant velocity and has a constant angular velocity. A tire that is slowing down and is spinning down. A wheel that is at rest and has a constant angular velocity. A football that is speeding up and is spinning up. A merry-go-round that is speeding up and is spinning down. A planet that moves along a perfectly circular orbit at a constant speed. Below are several diagrams showing a bar with various forces (the red arrows) acting on it. In which of these diagrams could the bar be is Choose all that apply.

Solution

3)    disc having constant velocity spinning up

      baseball at rest and spinning up

      turntable having constant velocity constant angular velocity

      wheel at rest and have constant angular velocity

     planet move around circular orbit with constant speed .

4)    Correct picture answer   is   1 , 4 , 6