Which of the following shapes is not an allowed trajectory of an object orbiting a star? (Assume no gas or dust is affecting the object's orbit.)
A) a hyperbola
B) a parabola
C) a spiral
D) an ellipse
C) a spiral
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A ______________ is always longer than a ______________
a. solar day; sidereal day b. solar day; mean solar day c. sidereal day; solar day d. mean solar day; solar day
Hawking radiation
What is the name of the earthquake scale that describes the severity of an earthquake by noting the amount of damage it causes?
a. Richter scale b. Mohs scale c. Torino scale d. Modified Mercalli scale.
An object is located on the optical axis and a distance of 8 cm from a thin converging lens having focal length 10 cm. the image of the object is
1.real, upright, and smaller than the object. 2.real, inverted, and smaller than the object. 3.real, inverted, and larger than the object. 4.virtual, upright, and smaller than the object. 5.virtual, inverted, and larger than the object. 6.virtual, upright, and larger than the object. 7.None of the above.