A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2), at a temperature of 260 K. The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively
Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to
A) 7.6 kJ. B) 6.8 kJ. C) 8.3 kJ. D) 6.1 kJ. E) 9.1 kJ.
B
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A magnetic field will deflect
a. an alpha particle. b. a beta particle. c. a gamma ray. d. an x-ray. e. all of the above.
A proton with initial kinetic energy KE is moving in circular motion in a uniform magnetic field. When it has completed one eighth of a revolution, what is its kinetic energy?
a. 1.4KE b. 0.71KE c. KE d. The value is not given.
A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2. What is the tension in the string?
A. 49 N B. 36 N C. 62 N D. 13 N E. 52 N
What type of stars does the bar contain?
A.) Old, cool stars that glow redder. B.) Young, cool stars that glow bluer. C.) Old, hot stars that glow bluer. D.) Old, cool stars that glow bluer. E.) The bar isn't made of stars, just gas.