Boyle's law says that the volume of a gas varies inversely with the pressure. when the volume of a certain gas is 4l , the pressure is 720 kpa (kilopascals). what is the pressure when the volume is 10l ?

What is the role of the ocular lens?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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?