A 4.2-L flask of ideal neon gas (which is monatomic) is at a pressure of 3.3 atm and a temperature of 450 K. The atomic mass of neon is 20.2 g/mol
How many neon atoms are in the flask? (R = 8.31 J/mol ? K, 1 atm = 101 kPa, NA = 6.022 × 1023 molecules/mol)
A) 2.3 × 1023
B) 2.3 × 1022
C) 6.9 × 1023
D) 2.3 × 1025
E) 6.9 × 1022
A
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Multiple-Object Accelerating Systems: A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor. How hard do the two boxes push against each other?
A. 12 N B. 20 N C. 24 N D. 32 N E. 0 N
Electric dipoles always consist of two charges that are
A) equal in magnitude; opposite in sign. B) equal in magnitude; both are negative. C) equal in magnitude; both are positive. D) unequal in magnitude; opposite in sign. E) unequal in magnitude; both are negative.
The densest stars in the H-R diagram are the white dwarfs
a. True b. False Indicate whether the statement is true or false
Which of the following is fundamentally different from the others?
A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves