A large 75-kg lighting fixture can be hung from wires of identical size and shape made of aluminum, brass, or copper. The values of Young's modulus for these metals are 0.70 1011 Pa (aluminum), 0.91 1011 (brass), and 1.1 1011 (copper).
Which wire would stretch the least distance?
A) brass B) copper
C) aluminum D) They will all stretch the same distance.
Question 2
A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is . You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
A) 8
B) 4
C) /2
D)
E) /8