A fixted pulley has a mechanical advance of 1. Why are fixed pullys useful machines?
A. The output force is greater than the input force.
B. They decrease overall work.
C. They make the load lighter.
D. They change the direction of the force
An atom loses an electron. What will happen when it approaches a positively-charged ion?
A.
The ions will repel each other.
B.
The ions will attract each other.
C.
The ions will cancel each other out.
D.
The ions will neither attract nor repel each other.
3 answers
If an atom has nine protons, eight neutrons and ten electrons what is its charge?
juusuhuc
1 answer