a 700 N man stands on a scale on the floor of an elevator. The scare records the force it exerts on whatever is on it. What is the scale reading if the elevator has an acceleration of 1.8 m/s squared up ? I need help with what formula (s) to use to get the answer. I didn't understand the answer when I plugged in the numbers.

Question

f = m (g+a)
f= 700n/9.81 kg (9.81 + 1.8)
I get 828440.367
i move the decimal point over 3 places to the left and get 828 kN
The answer the book gives is .83 k N
What am I doing wrong ? help

Answer 1

You are missing quite a lot on metric system.

700N/9.81m/s^2= 71 kg
71kg(9.8m/s^2+1.8m/s^2)=828N=.83kN

Answer 2

282.908318