Which one of the following is not a surface feature

of the Moon?
a) a maria.
b) A ray.
c) A node.
d) A rill.


c

Physics & Space Science

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A 3.00 kg mass is located at x = 2.0 cm and y = 4.0 cm. A 3.00 kg mass is located at x = -5.0 cm and y = 2.0 cm. A 4.00 kg mass is located at x = 3.0 cm and y = -3.0 cm. Where is the location of the center of mass (x, y)?

A. (0.60 cm, 0.30 cm) B. (0.90 cm, 2.0 cm) C. (3.0 cm, 1.0 cm) D. (0.30 cm, 0.60 cm) E. (3.9 cm, 3.0 cm)

Physics & Space Science

The conversion of mass to energy of other forms via nuclear fission is

A) less than 1%. B) about 10%. C) about 20%. D) about 30%. E) more than 30%.

Physics & Space Science

_____ are small icy bodies that orbit the Sun and produce tails of gas and dust when they approach the Sun

A) Comets B) Asteroids C) Meteorites D) Stars

Physics & Space Science

(d) A spaceship of mass 2m originally at rest burns some matter–antimatter fuel until the ship’s mass is m. The light energy ejected from the ship in this process has total energy m as well.

A. C B. F

Physics & Space Science