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.
A white dwarf star in orbit around Sirius (artist's impression)
Cryptorchidism. (a) In complete cryptorchidism, the testes of a newborn have failed to descend into
Image of an Almost-Extrasolar Planet
The skulls of living haplorhines differ from those of strepsirhines by having large brains, an enclo
Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on ...
Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an ...