An electromagnet is the most powerful type of magnet there is It is a magnet with a current running through it that can be turned on and off Why might it be useful to be able to turn the electromagnet on and off?
O to reduce wearing out of the magnet over time
O to control the strength of the magnet
O to not waste electricity
O to latch onto and let go of objects

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

What’s the theoretical yield of solid lead