Summary
- Dopper effect
- Wave Interference
- Standing waves
Standing waves in a pipe open at both ends are excited at a fundamental
frequency fopen. When one end is closed and the pipe is
again excited, the fundamental frequency is fclosed. How
do these frequencies compare?
A. fclosed = fopen
B. fclosed = ½ fopen
C. fclosed = 2fopen
D. fclosed = 1.5fopen
Answer
Walker4e
Reading quiz In which of the tubes is the pressure at the dashed line the greatest?
A. A
B. B
C. C
D. D
E. The pressures are all the same at the bottom.
Answer
sj6 1.5
What mass of a material with density ρ is required to make a hollow spherical shell having inner radius
r1 and outer radius r2?
A. 
B. 
C. 
D. 
Answer
sj6 14.5
What is the total mass of the Earth's atmosphere? Assume g = 9.80 m/s2
A. 3.55×1014 kg
B. 5.29×1018 kg
C. 8.78×1021 kg
D. 1.15×1025 kg
Answer
sj6 14.6
At a depth of 1000 m in sea water of ρ=1024 kg/m3, how much force must a 30 cm diameter submarine porthole
withstand?
A. 67.7 kN
B. 283 kN
C. 422 kN
D. 709 kN
Answer
sj6 14.17
How tall must a barometer be if it uses red wine
(ρ = 984 kg/m3 ) as its working liquid?
A. 0.964 m
B. 1.02 m
C. 10.5 m
D. 101 m
Answer
gc6 10.12
The maximum gauge pressure in a hydraulic lift is 17.0 atm. What is the largest mass vehicle it can lift if the diameter of
the output line is 28.0 cm?
A. 10,800 kg
B. 7,710 kg
C. 1100 kg
D. 476 kg
Answer
B. fclosed = ½ fopen
Closing one end of the tube changes the fundamental
wavelength from 2L to 4L. Doubling the wavelength cuts the frequency in
half, so the fundamental frequency of a tube that is closed at one end is half that of a
tube that is open at both ends.
E. The pressures are all the same at the bottom.
The pressure in a fluid is determined only by the depth in the
fluid, not the shape of the container.
A.
B. 5.29×1018 kg
D. 709 kN
C. 10.5 m
A. 10,800 kg
