One of the more popular rumors about New York City is that dropping a penny from the top
of the Empire State Building can result in the
death of a pedestrian below. In reality, a penny,
dropped from rest, reaches a speed of only
100.0 m/s at the bottom of the tower. How long
does it take the penny to fall?

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

Which of the following are appropriate acceleration units?

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.