Physics 104

26 October 1982

#1. At the bottom of a swimming pool is a drain pipe which has a **6.0
inch ** inner diameter. the opening of the pipe is covered by a simple,
water-tight cover lying on top of the opening. If the depth of the water
in the pool is **8.0 ft** at the position of the pipe, and the pipe is
filled with air and open to the atmosphere, then the force (**in lb**) needed
to raise the cover up off the pipe is most nearly equal to

**Answer:**

#2. A small boat is approximately **12 feet** long and **3 feet**
wide, and it weighs **100 lb**. By filling it with water and then
emptying it out, it is found that the maximum displacement of the boat is **43
cubic feet**. The amount of weight (i**n lb**) that can be added to
the boat so that it will just barely float is most nearly equal to

**Answer:**

#3. Water flows at a speed of **5.0 m/s** in a horizontal pipe.
The pipe tapers down to join with a smaller horizontal pipe with just half the
cross-sectional area. The difference in water pressure in going from the
larger to the smaller pipe is most nearly equal to

**Answer:**

#4. A siphon has a cross-sectional area of **0.750 cm ^{2}**.
It is connected as shown in the sketch to a container of fluid with a specific
gravity of

#5. A transverse wave on a string that has a wavelength of **1.65 ^{
}m** and obeys the following wave equation:

** ¶ ^{2}y / ¶x^{2} =
(
8.26 ´ 10^{-5}) ¶^{2}y
/ ¶t^{2}**

where ** x** and ** y** are in meters and ** t ** is in **seconds**. The frequency
(**in Hz**) of the wave is most nearly equal to

**Answer:**

#6. A string vibrates according to the equation

**y =
(0.75 cm) ´ [sin (p
x / 4 cm)
] ´ [ cos (25p t /sec) ]**

If the strength has a length **12 m**, then it is vibrating with its

**Answer:**

#7. A transverse sinusoidal wave is described by the equation

**y = (3.0 m) ´ sin [ 2 p
x /m - 11 p t /s - p/2]**

The phase speed (in **m/s**) of the wave is most nearly equal to

**Answer:**

#8. For the wave in problem

**Answer:**

#9. An acoustic interferometer containing air is pictured in the sketch.

#10. An open/closed organ pipe has a length of

**Answer:**

#11. Two identical tuning forks have identical frequencies of

**Answer**

#12. A point sound source emits

#13. A thermometer reads a temperature of

**Answer:**

#14. A uniform solid substance has a linear coefficient of expansion

#15. A glass (

**Answer:**