Select the correct answer. Which statement correctly defines displacement?
OA the maximum distance between the starting point and the ending point of a motion
OB. the shortest distance between the starting point and the ending point of a motion
OC the maximum distance between the starting point and the ending point of a motion, measured in the direction of motion
the distance vector between the starting point and the ending point of a motion
OE the distance vector between the ending point and the starting point
OD

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.