A block weighing 0.4 N is used to balance the bar. Calculate how far from the pivot the block needs to be placed to balance the bar.
Show your working.

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

What properties of a moving object are used in determining the object's energy of motion