Is the force of gravity stronger on a piece of crumpled paper or a normal piece of flat paper?

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Which composition of water moves to begin a deepwater current?