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

Physics & Space Science

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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

Physics & Space Science

Hawking radiation

a. explains how stars gravitationally collapse to form black holes. b. causes the short lives of black holes. c. is due to one particle from particle-antiparticle pairs. d. explains the accretion disks around black holes. e. provides for an event horizon.

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science