Theresistance per unit length of a piece of a copper wire with circular cross-section with diameterof 1.03 mm is 2.5 x 10-4Ω/cm. concentration of free electrons is 8.4 x 1028/m3. The current densityis 2.1 x 106A/m2(Assume that the free hole concentration equal zero).

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this