A satellite of mass 500 kg orbits the earth with a period of 6,000 s. The earth has a mass of 5.97 × 1024 kg, a radius of 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
(a) Calculate the magnitude of the earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the earth's surface.
(a) 3900 N (b) 7.5 × 105 m
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Free Fall: An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration due to gravity on the planet?
Fill in the blank(s) with the appropriate word(s).
We know that the central object in a planetary nebula has a surface temperature of at least ____ because the nebula contains large amounts of ionized hydrogen
a. 50 K b. 100 K c. 500 K d. 5,000 K e. 25,000 K
Which of the following statements regarding the determination of surface habitability and subsurface habitability of a planet is correct?
A) both surface and subsurface habitability can be determined only from robotic space probes B) surface habitability can be determined remotely by studying reflected starlight from a planet, while determining subsurface habitability would require a robotic space probe C) both surface and subsurface habitability can be determined by analyzing reflected starlight D) subsurface habitability can be determined remotely by studying reflected starlight from a planet, while determining surface habitability would require a robotic space probe
Energy to support a reasonable total biomass of ongoing life in a Europan ocean would probably come from
A) sunlight filtering through the ice B) organic material filtering down from the surface C) deep-sea volcanic vents D) meteoroid impacts on the surface