An ideal fluid with a specific gravity of 1.0 flows through the pipe in the direction from c to a. The pipe has the same diameter at a and c. The vertical pipes are vacuum sealed at the top. The height of the fluid at h1, h2, and h3 are measured from the center of the pipe, and are not drawn to scale.
(A) decrease by a factor of 2.
(B) remain the same.
(C) increase by a factor of 2.
(D) More information is required to predict the change in pressure.
(E) None of these
21. Below is a fluid in a glass tube. If the fluid molecules bond less strongly to the glass than to each other, which of the following represents the fluid in the tube?
(A)
(B)
(C)
(D)
(E) None of these.
22. A longitudinal wave travels through the air. The net movement of the air molecules is:
(A) zero
(B) in the direction of propagation of the wave.
(C) in the opposite direction of propagation of the wave.
(D) in the direction perpendicular to the propagation of the wave.
(E) None of these.
23. In deep water, the velocity of a surface wave is approximately proportional to the square root of the:
(A) wavelength
(B) amplitude
(C) depth
(D) density
(E) None of these.
24. If a higher note is played by the flute, which of the following properties of the sound wave must increase?
When an instrument plays a note, the resulting sound is a combination of all the possible harmonics for that instrument in its momentary configuration. For instance, a musician changes notes on a violin by pressing the strings against the neck of the instrument, thus shortening the string length and changing the possible harmonics. A given shortened string will play at one time all the possible harmonics allowable by its string length. A given note is the same set of harmonics for all instruments. The diagram below shows the sound waves of the same note played by three different instruments.
(A) period
(B) wavelength
(C) amplitude
(D) frequency
(E) none of these.
25. In order for the motion of the pendulum to approximate simple harmonic motion, which of the following must be true?
A pendulum with a string length l and a bob mass m is pulled back to an angle 
and released. The period of motion is T. The tension in the string is 
.
(A) T must be small.
(B) l must be large.
(C) must be small.
(D) m must be small.
(E) None of these.
26. An interstellar gas circles the core of earth’s galaxy. If the wavelength of the light reflecting off the gas coming toward the earth is 499 nm, and the wavelength of light reflecting off the gas moving away from earth is 501 nm, what is the speed of the gas?
(A) 4.2 
l04m/s
(B) 1.2 
l05m/s
(C) 6.0 l05m/s
(D) 1.5 l011m/s
(E) 4.2 l011m/s
27. If the particles begin and end at rest, and all are positively charged, the same amount of work was done on which particles?
The broken lines represent the paths followed by particles W, X, Y, and Z respectively through the constant electric field E. The numbers below the field represent meters.
(A) W and Y
(B) W, Y, and Z
(C) Y and Z
(D) W, X, Y, and Z
(E) W and Z
28. What is the voltage across the capacitor and the charge on the capacitor?
(A) 5 V, 5 
10-6 C
(B) 5 V, 10-5 C
(C) 10 V, 5 
10-6 C
(D) 10 V, 10-5 C
(E) 10 V, 10-6 C
29. Approximately how long is required for an electron to move from one electrode to the other around the circuit connected to a typical car battery? (Assume about 4 m of wiring.)
(A) a fraction of a second
(B) several seconds
(C) several hours
(D) forever
(E) several days
30. Which of the following represents the current i generated by the apparatus?
A conducting bar is slid at a constant velocity v along two conducting rods. The rods are separated by a distance l and connected across a resistor R. The entire apparatus is placed in an external magnetic field B directed into the page.
(A)
(B)
(C)
(D)
(E) None of these.
TEST 11
(A) 4 m
(B) 5 m
(C) 6 m
(D) 9 m
(E) 10 m
Дата добавления: 2015-11-04; просмотров: 21 | Нарушение авторских прав
| <== предыдущая лекция | | | следующая лекция ==> |