A diatomic molecule is vibrating in its first excited quantum state above the ground state
In that excited state, its frequency is 2.0 × 1013 Hz. What is the energy of the molecule in this state? (h = 6.626 × 10-34 J • s, h = 1.055 × 10-34 J • s, 1 eV = 1.60 × 10-19 J
A) 0.041 eV B) 0.083 eV C) 0.15 eV D) 0.12 eV E) 0.17 eV
D
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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 1cm in diameter and is located 2.00 m below the wide section. What is the pressure of the fluid in the narrow section? (density of the fluid is 1,000
A. 72 kPa B. 80 kPa C. 95 kPa D. 105 kPa E. 116 kPa
Which of the following screwdrivers would likely be the most effective to loosen a stubborn screw? Assume the size of the driver head is the same in each case
1.one with a handle that is 8 cm long and 2 cm wide 2.one with a handle that is 12 cm long and 2 cm wide 3.one with a handle that is 8 cm long and 4 cm wide 4.They would all loosen the screw just as effectively.
A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The efficiency of the engine is
a. 80% b. 40% c. 60% d. 20% e. 50%
A Carnot engine is operated as a refrigerator, taking in 18. J of heat every second and expelling 20. J into a 23.°C room. What is the temperature inside the refrigerator?
A) 300. K B) 15°C C) -15°C D) -6.6°C E) 3.0°C