The source of Earth's internal energy involves

A) kinetic energy.
B) potential energy.
C) radioactivity.
D) the Sun.


Answer: C

Physics & Space Science

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The eccentricity of a planet's orbit describes

a. westward motion in the night sky when observed on successive nights. b. the deviation in shape when compared to a circle. c. its tilt with respect to the ecliptic plane. d. the tilt of the planet's rotational axis with respect to the ecliptic.

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________________ absorbs most of the ultraviolet radiation coming from the Sun

Fill in the blank(s) with correct word

Physics & Space Science

Impedance: What resistance must be put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40,000 ??

A. 45 k? B. 40 k? C. 37 k? D. 26 k?

Physics & Space Science

When starting from rest at the bottom of a straight road with constant upward slope, Joan bicycles to the top 50.0 s ahead of Sally, whose travel time is 5.00 minutes. What is the ratio of Joan's acceleration to Sally's acceleration?

a. 0.694 b. 0.833 c. 1.20 d. 1.44 e. 6.00

Physics & Space Science