Suppose a doorknob is placed at the center of a door Compared with a door whose knob is located at the edge, what amount of
force must be applied to this door to produce the torque exerted on the other door?
A one half as much
B one fourth as much
C two times as much
D four times as much

If the area of a square has increased by a factor of 16, by how much has each side increased?

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine