Phys 101 help

"Edward Smith" wrote in message
...

"Edward Smith" wrote in message
.. .
I'm not above a few hints:

5. Superman jumps in front of a speeding bus, puts out his arms and
stops the bus in 1 second. If the bus was traveling at 37 mph and
weighs 57000 Lb. What force did Superman apply to the bus?
Hints:
Use the "Impulse Equation" to relate the average force to the change
in momentum in a period of time.
For the mass of the bus you use W = m · g which gives m = W / g .

Superman applied a force of__________ Lb. (Note English units.)

You know, in England - physicists use sensible units these days.

Use F=ma. You can figure out the acceleration. Two things to be
careful of. Watch the gravity term and make sure your units are
consistant.

The bus is going at about 16 m/s and the bus is about 20,000 kg.
a is 16 m/s in a second. So, thats 320,000N


I got through some college classes this way. Step 1: Convert to
Metric. Step 2: Solve Problem. Step 3: Convert back.

MUCH easier.

hopefully you don't do calcs for mars landers like that.