Which of the following situations describes static friction? a. A heavy crate standing on a rough patch of mud and is being pushed by two workers, but they cannot get it to move b. A large piano resting on a sheet of ice is being pushed by a child, but the child is not strong enough to get it to move

A.

Explanation:

The answer is A because the weight of the crate is sitting on something rough. The roughness is going to resist anything that tries to move against it because the force being exerted by the 2 workers is not strong enough to get the crate to move out of its place on the mud since it's static.

The answer can't be B because ice is smooth and doesn't have any friction, the little girl can't move it because it's to heavy for her to move, not because there's friction acting against it.

A. A heavy crate standing on a rough patch of mud and is being pushed by two workers, but they cannot get it to move.

Explanation:

I got it correct on the test.

the answer is a i think

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge