(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

"During the launch, a rocket is accelerated with 20.0m/s^2 upward. A 105.0kg astronaut is more concerned about his weight than about his safety and is standing on a scale. What is the scale reading in kg?"

2. Relevant equations

F=ma and also 4.45N=1lb

3. The attempt at a solution

So, first I solved F=ma with the information given to get 2100N, and since I don't think that N can convert to kg with an equation, I took from the front of the book that 1kg=2.20lbs where g=9.80m/s^2, so I thought that I could figure out what 1kg was with an acceleration of 20m/s^2, and I got that 4.5lbs would equal 1kg.

I then took my previous answer of 2100N and converted it to 471.9lbs and divided by 4.51lbs, hoping to get the correct kg with the acceleration given, but I got 104.6 which seems very wrong (first, because it's almost exactly the starting weight and second, because it should be higher, not lower than the starting weight). Thoughts?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Weight on a rocket accelerating upward

**Physics Forums | Science Articles, Homework Help, Discussion**