4. Although people would surely avoid getting into the ele- vator with you, suppose that you weigh yourself while on an elevator that is moving. Would you weigh more than, less than, or the same as when the scale is on a stationary floor? In Fig. , a passenger of mass m = 72.2 kg stands on a platform scale in an elevator cab. We are concerned with the scale readings when the cab is stationary and when it is moving up or down. (a) Find a general solution for the scale reading, whatever the vertical motion of the cab. (b) What does the scale read if the cab is stationary or moving upward at a constant of 0.5 m/s? (c) What does the scale read if the cab accelerates upward at 3.20 m/sec² and downwards at 3.2 m/sec²? (d) During the upward acceleration in part (c), of the net what is the magnitude F force on the passenger, and what is the of his acceleration as magnitude a measured in the frame of the cab? Does F = ma ? -Passenger " These forces compete. Their net force (a) (b) causes a vertical acceleration. (a) A passenger stands on a platform scale that indi- cates either his weight or his apparent weight. (b) The free-body diagram for the passenger, showing the normal force Fy on him from the scale and the gravitational force F.