1. an astronaut with a mass of 77.5kg is stuck in space floating 15.0m away from his ship.
his motion relative to the ship is 0 m/s. fortunately, he is holding a 2.0kg wrench. he throws
the wrench in the opposite direction of the ship at 12m/s. what is the wrench's change in
momentum?

24 kg m/s

Explanation:

The change in momentum of the wrench is given by:

where

is its final momentum

is its initial momentum

At the beginning, the wrench is at rest together with the astronaut, so its momentum is zero:

After it is launched, its momentum becomes

where

m = 2.0 kg is its mass

v = 12 m/s is its velocity (taking the direction of the wrench motion as positive)

Substituting,

So, the wrench's change in momentum is

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

a.   mass number from atomic number