Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 21, Problem 8CC
To determine
The lowest possible approximate mass of a black hole resulting from a stellar collapse.
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Suppose astronomers found evidence of an earth-like planet 20 lightyears away.
a) what may be two ethical considerations that one may consider when deciding if humans should travel to this planet?
b) how fast would a spaceship need to travel if the roundtrip can no take longer than 40 years for the astronauts?
c) how much time will the trip take according to the people on earth?
Question 8
The star Betelgeuse is about 520 light-years away, If the speed of light were twice its present value,
how far away would Betelgeuse be?
O 2080 ly
O 560 ly
O 260 ly
O 1040 ly
O 130 ly
Question 9
Which of the following is the reason for an ocean of water under Europa's frozen surface?
O Europa had many icy comets crash into the surface bring water to the moon and melting the water as it fell
into the core.
O Furopa formed with an unusual amount of liquid water in the core and the coldness of space wasn't able to
freeze it.
O upiter's strong gravitational force is causing Europa to flex in its orbit, leading to an increase in internal
heating.
O Europa's close proximity to Jupiter puts it into a gravitational tug-of-war with Jupiter's targest moon
Ganymede.
Question 10
How was Neptune discovered?
O When a large comet broke up and hit the planet, the explosion was seen from Earth-based telescopes
O From a large sky survey that identified the "blue-green" planet.
O By watching…
6. Consider a planet of mass m in orbit about a star of mass M.
Since M >> m, we can assume the star is at rest.
a) Show that the energy of the planet can be written as
GMm
E =
2mr?
b) Now assume the planet is in a perfectly circular orbit. What is the
energy in this case?
c) Represent the energy obtained in part (b) on an energy diagram.
(Draw and label very carefully.)
Chapter 21 Solutions
Universe
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