# Centrifugal speed (MPH) converted to G's

1. Nov 15, 2015

### F Mills

HI, let's save introductions till later, I'd like to get right to it.

two questions:

If a person weighs 100 lbs and is on a centrifuge spinning at 1,000 MPH, what is the G-force exerted by his body?
If a person weighs 100 lbs and is on a centrifuge spinning at 500 MPH, what is the G-force exerted by his body?

2. Nov 15, 2015

### CWatters

You can't spin in "miles per hour".

3. Nov 15, 2015

### Buzz Bloom

Hi F Mills:

You need to also know the radius of motion. How far from the axis of rotation are you?

See https://en.wikipedia.org/wiki/Circular_orbit .

Regards,
Buzz

4. Nov 15, 2015

### F Mills

Yeah, that's the problem I'm getting when googling speed to G force calculators, can you do some conversions and come up with an answer, it's over my head.

5. Nov 15, 2015

### Staff: Mentor

Welcome to the PF.

And use F = mv^2/r. Be sure to keep your units consistent (like meters, kilograms and seconds).

What is the context of your question? Going to be flying a fighter jet soon and want to know what to expect?

6. Nov 15, 2015

### F Mills

3,959 miles (6,371 kilometers) one revolution per 23 hours 56 minutes and 4 seconds.

7. Nov 15, 2015

### F Mills

Calculating g force applied to 100 lb person on the equator of earth.

8. Nov 15, 2015