An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?
A) 260 mi/h B) 280 mi/h C) 275 mi/h D) 270 mi/h
D
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A sealed 26- tank is filled with 2000 moles of oxygen gas (O2 ) at an initial temperature of 270 K. The gas is heated to a final temperature of 460 K. The ATOMIC mass of oxygen is 16.0 g/mol,
and the ideal gas constant is R = 8.314 J/mol • K = 0.0821 L • atm/mol • K. The final pressure of the gas is closest to A) 0.31 MPa. B) 0.33 MPa. C) 0.36 MPa. D) 0.29 MPa. E) 0.34 MPa.
Identify a true statement about Population II stars
A) Most of them are post-main sequence stars. B) They are located in the disk component of the galaxy. C) Most of them follow elliptical orbits. D) They have higher metal content than Population I stars.
If two objects each carrying a charge of 1 coulomb were placed 1 meter apart, how much force would they exert on each other?
A) 9 N B) 106 N C) 9 x 109 N D) zero E) 1 N
Certain stars at the end of their lives are thought to collapse combining their protons and electrons together to form a neutron star. Such a star could be thought of as a giant atomic nucleus. If a star of mass equal to that of the Sun (M = 1.99 × 10^30 kg) collapsed into neutrons (mn = 1.67 × 10^?27 kg), what would be the radius of such a star? (Hint: r = r0A1/3, where r0 = 1.20 × 10^?15
m). a. 25.4 km b. 18.7 km c. 12.7 km d. 6.40 km