The captain of a spaceship orbiting planet X discovers that to remain in orbit at from the planet's center, she needs to maintain a speed of What is the mass of planet X? (G = 6.67 10-11 N m2/kg2 )
A) 2.8 1019 kg
B) 4.2 1017 kg
C) 2.8 1016 kg
D) 4.2 1014 kg
Question 2
An atom's atomic number is
A) the number of protons in its nucleus.
B) the number of electrons orbiting the nucleus of the neutral atom.
C) Both of the above.
D) the number of electrons orbiting the nucleus of the ionized atom.
E) All of the above.
Extent of agricultural activity across the planet (data from Foley et al. 2005).
When horses lie down to sleep, others in the herd remain standing, awake or in a light doze, keeping
Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
Mercury’s Orbit Explained by General Relativity
Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on ...
A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has ...