1-Calculate the force (in N) a piano tuner applies to stretch a steel piano wire 8.00 mm, if the wire is originally 0.850 mm in diameter and 1.35 m long. The Young's modulus for steel is 210 x 109N/m2. 2-Find the angle, in degrees, of the slope of a hill that a 65 kg skier could coast down at a constant speed. s=0.14 and k=0.10 for the skies on wet snow