The jovian planets have no solid surface
Indicate whether the statement is true or false
TRUE
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A 910-kg object is released from rest at an altitude of 1200 km above the north pole of the earth
If we ignore atmospheric friction, with what speed does the object strike the surface of the earth? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, the polar radius of the earth is 6357 km) A) 2.2 km/s B) 4.5 km/s C) 2.7 km/s D) 4.8 km/s E) 3.2 km/s
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.
What information can be gained from the light curves of eclipsing binaries?
A) their masses B) their distances C) their luminosities D) their temperatures E) their sizes
An apparent westward motion of a planet in the sky compared to the background stars (as viewed from Earth) when observed on successive nights is referred to as
a. epicycle. b. retrograde motion. c. prograde motion. d. heliocentric motion. e. deferent.