If the radius of the Earth somehow increased with no change in mass, your weight would
A) increase.
B) not change.
C) decrease.
Answer: C
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Which of the following is a megawatt?
A) 109W B) 106W C) 1000 W D) 10-9W E) 10-6W
Molecular Speeds: An oxygen molecule, O2, falls in a vacuum. From what height must it fall so that its translational kinetic energy at the bottom of its fall equals the average translational kinetic energy of an oxygen molecule at 920 K? The mass of one O2 molecule is 5.312 × 10-26 kg, and the Boltzmann constant is 1.38 × 10-23 J/K. Neglect air resistance and assume that g remains constant at 9.8 m/s2 throughout the fall of the molecule.
A. 49 km B. 12 km C. 24 km D. 37 km E. 5.2 km
Which of the following is not one of the three major strategies used to measure the mass of a galaxy cluster?
A) measuring the speeds of galaxies orbiting the cluster's center B) studying x-ray emission from hot gas inside the cluster C) observing how the cluster bends light from galaxies located behind it D) measuring the temperatures of stars in the halos of the galaxies
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.