4. An electron transverses a vacuum tube with a length of 2 m in 2 X 10-3 sec. What is the average speed of the electron during this time in m/sec?​

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.