What is the speed of sound in air at a temperature of 110 F?
a. 279 m/s
b. 407 m/s
c. 256 m/s
d. 3 470 m/s
[Ques. 2] A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint?What is the magnetic flux through a circular cross-sectional area of the solenoid at its midpoint?
a. 1.02E5 T/m2
b. 3.05E6 T/m2
c. 2.49E7 T/m2
d. 3.39E5 T/m2
[Ques. 3] A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1 000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment?
a. helium
b. oxygen
c. carbon dioxide
d. They all have the same frequency of sound.
[Ques. 4] A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint?What is the magnetic field strength inside the coil at its midpoint?
a. 2.02E3 T
b. 6.74E3 T
c. 6.07E4 T
d. 4.95E5 T
[Ques. 5] Material 1 has Young's modulus Y1 and density 1, and material 2 has Young's modulus Y2 and density 2 . If Y1 is 30 more than Y2 and 1 is 30 less than 2, which material has the higher speed of sound and how much higher is it?
a. Material 1 has a speed of sound more than 35 higher than material 2 b. Material 1 has a speed of sound 30 higher than material 2.
c. Material 2 has a speed of sound more than 80 higher than material 1 d. Material 2 has a speed of sound 30 higher than material 1.
[Ques. 6] Three loops of wire, one circular, one rectangular, and one square, are made from identical lengths of wire. If the loops are in the same increasing magnetic field perpendicular to the plane of the coils, which loop has the greatest induced emf?
a. the circular one
b. the rectangular one
c. the square one
d. All three would have the same emf induced.
[Ques. 7] Material 1 has Young's modulus Y1 and density 1, material 2 has Young's modulus Y2 and density 2, and material 3 has Young's modulus Y3 and density 3 . If Y1 > Y2 > Y3 and if 1 < 2 < 3, which material has the highest speed of sound?
a. material 1
b. material 2
c. material 3
d. They could all have equal speeds of sound.
[Ques. 8] A coil in a magnetic field encloses a flux of 0.196 Tm2 when the angle between the normal to the coil and the direction of the magnetic field is 62.0. What flux would go through the coil if the angle were changed to 38.9?
a. 0.118 Tm2
b. 0.123 Tm2
c. 0.539 Tm2
d. 0.325 Tm2
e. 0.139 Tm2
[Ques. 9] How far away is a lightning strike if you hear the thunderclap 6.0 s after you see the lightning bolt strike? (vsound = 340 m/s, vlight = 3.0 108 m/s)
a. 57 m
b. 340 m
c. 1 700 m
d. 2 000 m
e. 18 108 m/s
[Ques. 10] A loop of area 0.384 m2 is in a uniform 0.0565-T magnetic field. If the flux through the loop is 6.10 103 Tm2, what angle does the normal to the plane of the loop make with the direction of the magnetic field?
a. 73.7
b. 89.3
c. 16.3
d. 76.0
e. This is not possible.
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