Light having a frequency in vacuum of 6.0 × 1014 Hz enters a liquid of refractive index 2.0. In this liquid, its frequency will be
A) 12 × 1014 Hz
B) 6.0 × 1014 Hz
C) 3.0 × 1014 Hz
D) 1.5 × 1014 Hz
E) None of the above choices are correct.
B
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An object with a mass of 5 kg is dropped and takes 9 s to hit the ground. Then another object with a mass of 10 kg is dropped from the same point. How long does it take to hit the ground?
a. 9 s b. 18 s c. 5 s d. 81 s e. 729 s
Charge: A piece of plastic has a net charge of +2.00 ?C. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)
A. 1.25 × 1013 B. 1.25 × 1019 C. 2.50 × 1013 D. 2.50 × 1019 E. 3.01 × 1023
The actual depth of a shallow pool 1.00 m deep is not the same as the apparent depth seen when you look straight down at the pool from above. How deep (in cm) will it appear to be? (nwater = 1.33.)
A. 133 B. 75.2 C. 90.6 D. 117 E. 100
Two long pipes, one having a 10-cm-OD and a surface temperature of 300°C, the other having a 5-cm-OD and a surface temperature of 100°C, are buried deeply in dry sand with their centerlines 15 cm apart. Determine the rate of heat flow from the larger to the smaller pipe per meter length.
GIVEN
Two long pipes buried deeply in dry sand
Pipe 1
Diameter (D1) = 10 cm = 0.1 m,
Surface temperature (T1) = 300°C
Pipe 2
Diameter (D2) = 5 cm = 0.05 m,
Surface temperature (T2) = 100°C
Spacing between their centerlines (s) = 15 cm = 0.15 m
FIND
The rate of heat flow per meter length (q/L)
ASSUMPTIONS
The heat flow between the pipes is two dimensional
The system has reached steady state
The thermal conductivity of the sand is uniform
SKETCH
