At the North Pole, the summer solstice Sun ________.
A. rises north of east and sets north of west
B. circles the pole along the horizon
C. is directly overhead for the entire day
D. circles the pole 23.5 degrees below the horizon
E. circles the pole 23.5 degrees above the horizon
Answer: E
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An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away
(One light-year is the distance light travels in one year.) According to the astronaut, how long does the trip take? A) 15.0 y B) 14.4 y C) 22.7 y D) 4.20 y E) 9.34 y
Which statement is a common misconception with regard to Earth's atmosphere? a. The carbon dioxide added to the atmosphere since the year 1800 is mostly or entirely due to human burning of fossil fuels. b. All of Earth will warm at the same rate if there is global warming
c. The ozone layer in the upper atmosphere protects the lower atmosphere and Earth's surface from harmful solar UV radiation. d. Global warming and ozone depletion are two very different activities in Earth's atmosphere. e. Earth has experienced a greenhouse effect its entire planetary history.
Work Done by a Gas: A gas expands from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while its pressure increases linearly with the volume (so that the process follows a straight-line path in a pV diagram) from 110 kPa to 225 kPa. How much work is done by the gas during this expansion?
A. 5.2 kJ B. 7.5 kJ C. 7.8 kJ D. 11 kJ E. 12 kJ
A steel hanger with solid cross section has horizontal force P 5 5.5 kN applied at free end D. Dimension variable b 5 175 mm and allowable normal stress is 150 MPa. Neglect self-weight of the hanger. The required diameter of the hanger is approximately:
(A) 5 cm
(B) 7 cm
(C) 10 cm
(D) 13 cm
