Author Question: The density of aluminum is 2.7 103 kg/m3. The speed of longitudinal waves in an aluminum rod is ... (Read 123 times)

ETearle · **on:** Jul 29, 2018

The density of aluminum is 2.7 103 kg/m3. The speed of longitudinal waves in an aluminum rod is measured to be 5.1 103 m/s. What is the value of Young's modulus for aluminum?

A)

7.0 1010 N/m2
B)

7.0 107 N/m2
C)

2.2 1011 N/m2
D)

2.2 109 N/m2
E)

1.4 107 N/m2

Question 2

The energy stored in the earth's magnetic field with a strength of 0.5 10-4 T in a room 3.0 m by 4.0 m by 2.4 m is

A)

570 mJ.
B)

29 mJ
C)

10 mJ.
D)

100 mJ.
E)

zero.