in the international space station she is quite capable of manipulating both , although the scientific instrument responds much more slowly than the wrench . explain why
Jim's answer regarding f=ma is applicable.
Keep in mind that the equation f=ma works in the presence of gravity too.
The net force f includes the force of gravity as well as the force the astronaut applies. So, to lift an object in the presence of gravity, the astronaut must overcome the force of gravity.