15 points ! no guessing
a watershed is the land that water flows across or through on its way to a stream, lake, wetland, or other body of water. how do scientists recommend preserving a watershed?
a.
encourage agricultural usage in the watershed
b.
preserve forests and wetlands within the watershed
c.
create lakes by damming up rivers in the watershed
d.
increase construction within the watershed

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. how long will the ball be in the air before it lands? how far will the football travel before it lands?

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =