Which of the following statements is true? Communicable diseases cannot be transmitted by nonliving objects. Sexually transmitted diseases are spread by direct contact with bodily fluids. Gastrointestinal diseases are usually transmitted by infected water droplets in the air. The best prevention against communicable diseases is over-the-counter medication.

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?

What happens to the electrostatic force between two charged particles if the distance between them is doubled?

Human population projections are subject to change due to fluctuations in global fertility and mortality rates