Please help with my question ill give you the big brain award

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

Could we see a galaxy that is 20 billion light-years away?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?