A person of weight 480 N stands on a scale in an elevator. What will the scale h

Question

A person of weight 480 N stands on a scale in an elevator. What will the scale he reading when the elevator is decelerating upward at 1.00 m/s^2 ? A. 490 N B. 470 M. C. 528 N D. 432 N E. 500 N 16. Waldenia and Carpuccio are accelerating a wagon a acceleration of a. Each person is pulling with the same force in the same direction. If Waldenia falls into the wagon, effectively doubling its mass, and Carpuccio continues to pull in the same way. the acceleration of the wagon will be A. a/2 b. 4a c. 3/2a d. a/4 e/2a

Explanation / Answer

15) d) 432 N

m = w/g = 480/10 = 48 kg

scale reading, N = m*g + m*a

= 480 + 48*(-1)

= 432 N

16) d) a/4

let m is initial mass and F is the force applied by each person.

so, a = (F + F)/m

= 2*F/m

a/2 = F/m

in the second case

a' = F/(m+m)

= F/(2*m)

= (1/2)*(F/m)

= (1/2)*(a/2)

= a/4

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