A0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s2. what is the centripetal acceleration of a point on the outer edge of the tire after 5.0 s

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?

Which planets are visible without a telescope

What practical value did astronomy offer to ancient civilizations?