Are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all? Explain.
a. A 200 pound barbell is held over your head.
b. A girder is lifted at constant speed by a crane.
c. A girder is being lowered into place. It is slowing down.
d. A jet plane has reached its cruising speed and altitude.
e. A box in the back of a truck doesn’t slide as the truck stops.
Step 1 of 5
We need to find out the objects are in static equilibrium, dynamic equilibrium or not in equilibrium.
- In this case the barbell held over the person's head is not accelerating and the velocity is zero so it will be in static equilibrium.