Which of the following media cannot support longitudinal waves?
a. aluminum
c. string
b. air
d. water
C
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The mass of a single galaxy might be found by
a. the double galaxy method. b. the rotation curve method. c. the cluster method. d. any of these methods. e. none of these methods.
Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm. What is the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other?
A) 1.5 × 10-6 T B) 3.3 × 10-6 T C) 6.7 × 10-6 T D) 3.3 × 10-5 T E) 6.7 × 10-5 T
An ideal gas is compressed isothermally from 30 L to 20 L. During this process, 6 J of energy is expended by the external mechanism that compressed the gas. What is the change of internal energy for this gas?
A) +6 J B) zero C) -6 J D) +12 J E) -12 J
A battery with an emf of 12 V theoretically supplies 4 A of current to the circuit's load if internal resistance is not taken into consideration. When the internal resistance is included, the current is calculated to be 3 A. The load's resistance, R, and the internal resistance, r, are
1. R = 1 ?, r = 3 ? 2. R = 1/3 ?, r = 11/3 ? 3. R = 3 ?, r = 1 ? 4. R = 3 ?, r = 4 ?