The uncertainty in the zz-component of an electron's velocity is 0.260 m/sm/s. What is the minimum uncertainty in a simultaneous measurement of the zz-coordinate of the electron

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?