Author Question: A mass of 1000 kg hangs at the end of a steel rod 5.0 m in length. The diameter of the rod is 0.80 ... (Read 75 times)

hbsimmons88 · **on:** Jul 27, 2018

A mass of 1000 kg hangs at the end of a steel rod 5.0 m in length. The diameter of the rod is 0.80 cm and Young's modulus for the rod is 210,000 MN/m2. What is the elongation of the rod?

A) 1.2 cm
B) 0.46 cm
C) 0.12 cm
D) 1.8 cm
E) 0.047 cm

Question 2

A device obeying Ohm's law must have a resistance which

A) is proportional to voltage.
B) is proportional to current.
C) is constant.
D) is zero.