Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 18, Problem 8P
To determine
The time taken by radio commands to travel from Earth to Voyager 2 as it passed Jupiter.
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Calculate how long radio communications from the spacecraft will take when it encounters Mars. The furthest distance from Earth to Mars is 2.66 AU. Remember that 1 AU = 1.5 x 1011 m and that light travels at 3 x 108 m/s. So how long will the radio messages take to travel this greatest distance of 2.66 AU?
If two way communication between the Earth and the spacecraft involve a 1 s time lapse before an acknowledging signal is sent by the spacecraft, how long a time is there between sending a command to the spacecraft and receiving a reply?
Voyager 2.
When the Voyager 2 spacecraft was approaching towards its Neptune encounter in
1989, it was 4.5 × 10° km away from the earth. Its radio transmitter, with which it
communicated with us (and we communicated with it), broadcast with a mere 22 Watt
of power at the S-band (2.1 GHz). (Your home wi-fi router emits around 2 Watt at 2.4
GHz wi-fi band). Assuming the Voyager transmitter broadcast equally in all directions,
(a) What signal intensity was received on the earth?
(b) What electric and magnetic field amplitudes were detected?
(c) How many 2.1 GHz photons were arriving per second on a radio-receiver antenna
with a circular cross-section of diameter 34 meters?
Two counter-propagating plane waves
(a) Let E(z, t) = E0 cos(kz – wt)â + E, cos(kz + wt)x. Write E(z, t) in simpler form
and find the associated magnetic field.
(b) For the fields in part (a), find the instantaneous and time-averaged electric and
magnetic field energy densities.
(c) Let E(z, t) = E, cos(kz – wt)x + E,…
You are a rover pilot on the crew of the initial exploration team sent to Kepler 22b,the first extrasolar planet discovered within the habitable zone of a sun-like star. Thescience team recently discovered liquid water on the surface. (Hurrah!) Your rover isat point A on the shore of a circular lake with radius 4 km collecting samples. Thescience team wants to send your rover to a point C diametrically opposite A. Therover can drive around the circumference of the lake at a rate of 4 km per hour andfly over the lake at a rate of 3 km per hour.(a) How long will it take the rover to fly across the lake?(b) How long will it take the rover to drive around the shore of the lake?You could also fly at an angle θ along a chord inside the circular lake, andcomplete the rest of the path driving along the circumference of the lake.(c) Find the length of the chord in terms of θ. How long will it take the drone totraverse the chord?(d) Find the length of the remaining shoreline after the cord in…
Chapter 18 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 18 - Why is Jupiter so much richer in hydrogen and...Ch. 18 - How can Jupiter have a liquid interior and not...Ch. 18 - How does the dynamo effect account for the...Ch. 18 - Why are the belts and zones on Saturn less...Ch. 18 - Why do astronomers conclude that none of the...Ch. 18 - How can a moon produce a gap in a planetary ring...Ch. 18 - Explain why the amount of geological activity on...Ch. 18 - Prob. 8RQCh. 18 - Prob. 9RQCh. 18 - Prob. 10RQ
Ch. 18 - What are the seasons on Uranus like?Ch. 18 - Prob. 12RQCh. 18 - What evidence is there that Neptune’s moon Triton...Ch. 18 - How do astronomers account for the origin of...Ch. 18 - What evidence indicates that catastrophic impacts...Ch. 18 - Prob. 16RQCh. 18 - Some astronomers argue that Jupiter and Saturn are...Ch. 18 - Prob. 2DQCh. 18 - What is the maximum angular diameter of Jupiter as...Ch. 18 - What is the angular diameter of Jupiter as seen...Ch. 18 - Measure the polar and equatorial diameters of...Ch. 18 - If you observe light reflected from Saturn’s...Ch. 18 - One way to recognize a distant planet is by its...Ch. 18 - If Uranus’s epsilon ring is 50 km wide and the...Ch. 18 - If Neptune’s clouds have a temperature of 60 K, at...Ch. 18 - Prob. 8PCh. 18 - Prob. 9PCh. 18 - The orbital period of Charon is given in the...Ch. 18 - Prob. 1LTLCh. 18 - Prob. 2LTLCh. 18 - Prob. 3LTL
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