When two strings of equal length on a guitar are played, two different pitches are heard. Comparing the waves on the lower pitch string to the higher, the waves on the higher pitch string have
A. a shorter wavelength.
B. a larger period.
C. a larger amplitude.
D. a higher speed.
Answer: D
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Liquid metallic hydrogen is found in the interior(s) of
a. Jupiter. b. Saturn c. both of the above a and b. d. neither of the above a and b
The room-temperature electrical conductivity of pure silver is 6.8×107 (?·m)-1 , and for pure copper the electrical conductivity is 6.0×107 (?·m)-1 . An alloy is made of 40 vol % copper and 60 vol % silver. Copper and silver form a eutectic phase diagram, with no solubility of copper in silver or of silver in copper at room temperature. Predict the room-temperature electrical resistivity of an alloy made from these materials.
What will be an ideal response?
In the first law of thermodynamics, W is the work done on the system, that is, W is positive if work is done on the system
Indicate whether the statement is true or false
Water (density = 1 × 10^3 kg/m3) flows at 16 m/s through a pipe with radius 0.040 m. The pipe goes up to the second floor of the building, 3.0 m higher, and the pressure remains unchanged. What is the speed of the water flow in the pipe on the second floor?
a. 13 m/s c. 15 m/s b. 14 m/s d. 16 m/s