Suppose Earth's axis had a greater tilt (more than 23.5 degrees). Which of the following statements would not be true?
A) The celestial sphere would be covered by a different set of constellations than it is with the current axis tilt.
B) Seasonal temperature variations would be more extreme than they are with the current tilt.
C) We would have more daylight in summer and less daylight in winter than we do with the current tilt.
D) The Arctic and Antarctic circles would be located closer to the equator than they are now.
A
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A vertical tube one meter long is open at the top. It is filled with 75 cm of water. If the velocity of sound is 344 m/s, what will the fundamental resonant frequency be (in Hz)?
A. 3.4 B. 172 C. 344 D. 1.7 E. 688
A 450 g baseball is pitched, reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s. If the ball was in contact with the bat for 0.22 seconds, what was the average net force experienced by the ball during the time of contact?
A. 170 N B. 98 N C. 77 N D. 18 N
Suppose that at a certain time a quanton has a well-defined position x = 0.15 nm. At that time, we perform an experiment to determine the quanton’s momentum, and find it has a value that corresponds to a de Broglie wavelength of 0.45 nm to a high degree of precision. What can we say about the quanton’s position after the experiment?
A. It is still 0.15 nm. B. It is now 0.45 nm. C. It is now within ±0.45 nm of 0.15 nm. D. It is now undefined but probably close to 0.15 nm. E. It is now completely undefined. F. Other (specify).
Which of the solenoids described below has the greatest magnetic field along its axis?
A) a solenoid of length L, with N turns and a current I B) a solenoid of length L, with N/2 turns and a current I C) a solenoid of length L/2, with N/2 turns and a current I D) a solenoid of length 2L, with N turns and a current I/2 E) a solenoid of length 2L, with 2N turns and a current 2I