Consider two uniform solid spheres where one has twice the mass and twice the diameter of the other. The ratio of the larger moment of inertia to that of the smaller moment of inertia is
A) 10.
B) 8.
C) 2.
D) 6.
E) 4.
B
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It would be easier to pull the hemispheres apart
1) when they are at sea level 2) if submerged several meters in water 3) if high above the clouds because 4) external pressure on the hemispheres is lessened. 5) water serves as a lubricant. 6) the atmosphere exerts a pressure of 105 N/m2 on both hemispheres.
Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because ________
A) of increased magnetic interference B) it is too dangerous to send the Space Shuttle to service satellites during solar maximum C) they are more likely to have their electronics "fried" by a solar flare during solar maximum D) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits
A saber-toothed-tiger's bones contain 1/32 of the amount of 14C that is contained in the bone material of living animals. The half-life of 14C is 6000 years. From this information, we can conclude
A) that the tiger died about [i.e., plus or minus a few thousand years] 42,000 years ago. B) nothing at all, because 14C dating is known to be inaccurate. C) nothing at all, because of the uncertainties associated with radioactive decay. D) that the tiger died about 18,000 years ago. E) that the tiger died about 30,000 years ago.
An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
a. 0.69 kN b. 0.63 kN c. 0.66 kN d. 0.60 kN e. 0.57 kN