The extent to which Mars has been habitable essentially boils down to the
A) question of whether liquid water has ever been present on its surface
B) question of whether oceans of liquid water have existed on its surface
C) amount of water that has been present on its surface
D) length of time liquid water has been present at or below its surface
D
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What affects the average orbital speed of a star in our galaxy?
A) the star's mass and the mass of the galaxy B) the mass of the galaxy inside its orbit and the size of its orbit C) the mass and age of the star D) the mass and age of the galaxy
Two extremely flat glass plates, 10.0 cm wide, touch at one end but are separated by a thin wire at the other end, forming a wedge
Light with a wavelength of 450 nm shines almost perpendicularly on the glass and forms fringes which are 1.80 mm apart. What is the diameter of the wire? A) 25.0 µm B) 10.0 µm C) 20.0 µm D) 12.5 µm E) 17.5 µm
You have discovered a new asteroid, which has a moon in an elliptical orbit around it
From a series of observations, you establish that the closest approach occurs when the moon is 51,000 m from the asteroid, the furthest separation is 102,000 m, and the speed of the moon at the point of closest approach is 7.50 m/s. What is the mass of the asteroid? G = 6.67 x 10-11 N•m2/kg2.A) 4.25 × 1016 kg B) 9.87 × 1016 kg C) 3.22 × 1016 kg D) 2.04 × 1016 kg E) 5.05 × 1016 kg
A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If gm is the acceleration due to gravity at the surface of Mars, what is the acceleration due to gravity at the location of the satellite?
A) gm/9 B) 0 C) gm D) gm/3 E) gm/16