A weightless astronaut in an orbiting satellite is
A) shielded from Earth's gravitational field.
B) beyond the pull of gravity.
C) like the satellite, pulled by Earth's gravitation.
D) none of the above
Answer: C
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A window glass that is 0.5 cm thick has dimensions of 3 m by 1.5 m. The thermal conductivity of this glass is 0.8 W/m ? K
If the outside surface of the glass is at -10°C and the inside surface is at 20°C, how much heat flows through the window in every hour? A) 50 MJ B) 60 MJ C) 70 MJ D) 80 MJ
The "Cambrian explosion" refers to the
A) great many meteorite bombardments that occurred during that time. B) great diversity of life that blossomed during that time. C) evolution and great diversity of blastoids during that time period. D) numerous volcanic eruptions that took place during that time.
What would be the greatest effect of the finite size of molecules on the ideal gas law?
A) At low densities, the pressure would be less than that predicted by the ideal gas law. B) At high densities, the pressure would be less than that predicted by the ideal gas law. C) At high densities, the pressure would be greater than that predicted by the ideal gas law. D) At low densities, the pressure would be higher than that predicted by the ideal gas law. E) There is no effect.
A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa