A uniform meter stick, supported at the 30cm mark, is balanced when a 0.50N weight is hung at the 0.0cm mark. what is the weight of the meter stick?

It is really hard for me right know

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?

Boiling water is an example of physical change. true or false