Molecular Vibration: A diatomic molecule is vibrating in the v = 1 quantum state with a frequency of 2.0 × 1013 Hz. What is its vibrational energy? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 0.041 eV
B. 0.083 eV
C. 0.12 eV
D. 0.17 eV
Answer: C
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An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 4.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 1000
A. 1.50 cm B. 1.36 cm C. 1.28 cm D. 1.12 cm E. 1.00 cm
Which of the following quantities is equal to the energy per second generated by the Sun's nuclear reactions?
A) the force of gravity holding the Sun together B) the temperature of the Sun's core C) the luminosity of the Sun's photosphere D) the temperature at the Sun's photosphere
A cylindrical capacitor is made of two thin-walled concentric cylinders. The inner cylinder has radius r1 = 4.0 mm, and the outer one a radius r2 = 8.0 mm. The common length of the cylinders is L = 150 m
What is the potential energy stored in this capacitor when a potential difference 4.0 V is applied between the inner and outer cylinder? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 9.6 × 10-8 J B) 1.3 × 10-8 J C) 6.3 × 10-8 J D) 0.34 × 10-8 J E) 4.6 × 10-8 J
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The velocity is __________
Fill in the blank(s) with correct word