The precession of Earth's axis takes about _____ for one cycle
A) 10,000 years
B) 12,000 years
C) 26,000 years
D) 30,000 years
C
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An organ pipe closed at one end has a length of 60 centimeters. What is the wavelength of the second harmonic?
A. 20 cm B. 60 cm C. 80 cm D. 100 cm
In an electron two-slit experiment, the slits are 15 ?m apart. If the first diffraction maximum lies at an angle of 5.0 × 10-7 rad, what is the momentum of the incoming electrons?
A) 4.4 × 10-23 kg?m/s B) 2.2 × 10-23 kg?m/s C) 11 × 10-23 kg?m/s D) 6.6 × 10-23 kg?m/s E) 8.8 × 10-23 kg?m/s
When two solid spheres of the same material and same radius r are in contact, the magnitude of the gravitational force each exerts on the other is directly proportional to
a. r. b. r2. c. r3. d. r4. e. r6.
The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth
Indicate whether the statement is true or false