Rather than being a planet, Pluto is really just a large member of

A) the Kuiper belt.
B) an extrasolar planetary system.
C) the Oort cloud.
D) the moon system around Neptune.
E) the asteroid belt.


A

Physics & Space Science

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A. 770 cm3 B. 260 cm3 C. 520 cm3 D. 400 cm3

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What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?

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Angular momentum is conserved

A. only when the net force acting on the system is zero B. only when the angular velocity is zero C. only when the net torque acting on the system is zero D. in all cases

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A proton has a total energy of 2.5 × 10?10 J. How fast is it moving? (mp = 1.67 × 10?27 kg)

A. 0.90c B. 0.80c C. 0.70c D. 0.60c E. 0.40c

Physics & Space Science