The seasons are caused by the precession of Earth's axis

a. True
b. False
Indicate whether the statement is true or false


False

Physics & Space Science

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According to the unified model of active galactic nuclei, a ____________ is observed if our line of sight is parallel to the plane of the dense disk of an active galactic nucleus

a. blazar b. Type 1 Seyfert c. Type 2 Seyfert d. superluminal expansion e. quasar

Physics & Space Science

An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the radius were changed to 1000 m, but the speed remained the same, by what factor would its centripetal acceleration change?

a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00

Physics & Space Science

The radiation curve is a plot of light intensity versus frequency for an incandescent source. If this light is first passed through a cool gas, the resulting radiation curve would most probable look like

1) I. 2) II. 3) III. This best illustrates that the atoms of gas have 4) been excited. 5) absorbed part of the light. 6) simplified selective frequencies of the transmitted light.

Physics & Space Science

The figure shows an image of our galaxy, the Milky Way, at dust-penetrating wavelengths. It can be classified as which one of the following galactic types?

A. spiral B. irregular C. elliptical D. red giant

Physics & Space Science