What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's center?
G = 6.67 × 10?11 m3?kg?1?s?2; MEarth = 5.98 × 1024 kg
a.
2 m/s
b.
20 m/s
c.
200 m/s
d.
2000 m/s
e.
20,000 m/s
D
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Buoyancy: An object has a volume of 4.0 m3 and weighs 40,000 N. What will its apparent weight be in water of density 1000 kg/m3?
A. 40,000 N B. 39,200 N C. 9800 N D. 800 N
The point in Earth's orbit where Earth is farthest from the Sun is known as perihelion. precession. the winter solstice. aphelion. a and d.
a. aphelion.
b. perihelion.
c. precession.
d. the winter solstice
e. a and d
Regarding Ptolemy's and Copernicus's theories of astronomy, today we find that
A) both theories are useless because they disagree with the highly accurate measurements available today. B) Copernicus's theory is correct. C) Copernicus's theory is still useful, but more accurate theories are available today. D) both theories are false because we know that Kepler's theory is correct and precisely accurate. E) Ptolemy's theory is correct.
Natural uranium contains about what percentage of the fissionable isotope 235U?
a. 50% b. 99% c. 1% d. 19%