A 50-kg satellite circles planet Cruton every 5.6 h in an orbit with a radius of 12 × 10^6 m. What is the magnitude of the gravitational force on the satellite by planet Cruton?
a. 63 N
b. 58 N
c. 68 N
d. 73 N
e. 50 N
B
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Many galaxies with erupting black holes are found ____
a. in poor clusters with little intergalactic gas b. isolated in space c. in one of a pair of orbiting galaxies d. very close to the Milky Way galaxy e. in the Local Group
Galileo discovered ____ new planets called ‘Galilean moons.'
Fill in the blank(s) with correct word
Two ice skaters are at rest and facing each other. One skater weighs 140 lbs and the other skater weighs 180 lbs. The skaters "push off" of each other. The 140 lb skater is moving at 5.00 m/s to the EAST. What is the velocity of the 180 lb skater?
A. 6.50 m/s EAST B. 6.50 m/s WEST C. 3.89 m/s EAST D. 3.89 m/s WEST E. 1.55 m/s EAST
What do we mean when we say the universe becomes transparent at 400,000 years after the Big Bang?
A) the universe ends at that time B) Helium nuclei formed then and since they are transparent it was possible to see to larger distances C) we can only see from one end of the universe to another if we existed before that time D) electromagnetic radiation (light) can travel freely through the universe so we can see to large distances E) protons and neutrons formed then and since they are transparent it was possible to see to larger distances