Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 1, Problem 17Q
To determine
The distance of the person from the eye chart so that he should be able to see the two distinct lines.
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a method for determining the sizes of the orbits of pl
from the sun than Earth. His method involved noting
of days between the times that a planet was in the pc
A and B in the diagram. Using this time and the num
each planet's year, he calculated c and d.
a. For Mars, c= 55.2 and d= 103.8. How far is Mars
in astronomical units (AU)? One astronomical un
the average distance from Earth to the center of th
93 million miles.
b. For Jupiter, c 21.9 and d= 100.8. How far is Jup
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sun in astronomical units?
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expressed as length { in meters
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h divide out and T = VT2. The factor 2T has no units so
d in the analysis.
10. The period of rotation of the Sun is 2.125 x 106
seconds. This is equivalent to 2.125
(2) ms
(1) us
(3) Ms
(4) Ts
11. Human hair grows at the rate of 3 nanometers
per second. This rate is equivalent to
(1) 3 x 10-3 m/s
(2) 3 x 10-6 m/s
(3) 3 x 10-9 m/s
(4) 3 x 10-12 m/s
12. The wavelength of red light is 7 x 10-7 meter.
Express this value in nanometers.
13. If m represents mass in kg, v represents speed in
m/s, and r represents radius in m, show that the
force F in the formula F =
in the unit kg m/s2.
mv?
can be expressed
14. If PE, represents the potential energy stored in a
spring in kg m2/s², and x represents the change
in spring length from its equilibrium position in
m, what is the unit for the spring constant k in
the formula RE
Chapter 1 Solutions
Universe: Stars And Galaxies
Ch. 1 - Prob. 1QCh. 1 - Prob. 2QCh. 1 - Prob. 3QCh. 1 - Prob. 4QCh. 1 - Prob. 5QCh. 1 - Prob. 6QCh. 1 - Prob. 7QCh. 1 - Prob. 8QCh. 1 - Prob. 9QCh. 1 - Prob. 10Q
Ch. 1 - Prob. 11QCh. 1 - Prob. 12QCh. 1 - Prob. 13QCh. 1 - Prob. 14QCh. 1 - Prob. 15QCh. 1 - Prob. 16QCh. 1 - Prob. 17QCh. 1 - Prob. 18QCh. 1 - Prob. 19QCh. 1 - Prob. 20QCh. 1 - Prob. 21QCh. 1 - Prob. 22QCh. 1 - Prob. 23QCh. 1 - Prob. 24QCh. 1 - Prob. 25QCh. 1 - Prob. 26QCh. 1 - Prob. 27QCh. 1 - Prob. 28QCh. 1 - Prob. 29QCh. 1 - Prob. 30QCh. 1 - Prob. 31QCh. 1 - Prob. 32QCh. 1 - Prob. 33QCh. 1 - Prob. 34QCh. 1 - Prob. 35QCh. 1 - Prob. 36QCh. 1 - Prob. 37QCh. 1 - Prob. 38QCh. 1 - Prob. 39QCh. 1 - Prob. 40QCh. 1 - Prob. 41QCh. 1 - Prob. 42Q
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- The Earth is travelling around the sun at a speed of about 67,000 miles per hour [mph]. If it takes one year [yr] for the Earth to circle the Sun and we assume the Earth?s orbit is circular, what is the radius of the orbit in units of meters [m]? Use an appropriate SI prefix to report your answer so there are one, two, or three digits to the left of the decimal point.arrow_forwardIf you start at the equator and travel to 10 degrees north approx. how many kilometers (or miles) north of the equator will you be? Take the circumference of earth to be 40,000 kilometers (24,900) miles).arrow_forwardStars are spherical in shape. A star has a diameter of 77 x 1010 m. How many earths could fit inside this star. Diameter of earth 12800 km Note: Write the answer in scientific representation after rounding to two decimal places. Answer:arrow_forward
- Calculate the angle a person needs to lean from the vertical when 1. walking a 14 m (radius) circular track at 22 mins per mile, and Enter to 2 significant figures Angle with respect to the vertical = = 0.85 ! No, that's not the correct answer. O 2. running at 4 min per mile. Enter to 2 significant figures Angle with respect to the vertical = 6.8 Use 1 mile = 1609.4 m Sense-making: Do your results for the leaning angle during walking agree with your observations about people walking on circular tracks? Oarrow_forwardYou are in a car 54.9 meters away from a street sign (distance from your face to the sign). The text letters on the street sign are 15.2 cm tall. What is the visual angle of the street sign letters in arc minutes?arrow_forwardHelp me pls!! Thank youarrow_forward
- A planet's speed in orbit is given by V = (30 km/s)[(2/r)-(1/a)]0.5 where V is the planet's velocity, r is the distance in AU's from the Sun at that instant, and a is the semimajor axis of its orbit. Calculate the Earth's velocity in its orbit (assume it is circular): What is the velocity of Mars at a distance of 1.41 AU from the Sun? What is the spacecraft's velocity when it is 1 AU from the Sun (after launch from the Earth)? What additional velocity does the launch burn have to give to the spacecraft? (i.e. What is the difference between the Earth's velocity and the velocity the spacecraft needs to have?) How fast will the spacecraft be traveling when it reaches Mars? Does the spacecraft need to gain or lose velocity to go into the same orbit as Mars?arrow_forwardSolve the second onearrow_forwardA volume in space is exactly 1.00 pc3. Conversion from parsec to meters is 1 pc= 3.086 x 1016 m. How many cubic meters are contained in one cubic parsec?arrow_forward
- The diameter of Earth across the equator is 7928 miles. If a mile equals 1.609 km. what is Earths diameter in kilometers? In centimeters?arrow_forwardGalileos telescope showed him that Venus has a large angular diameter (61 arc seconds) when it is a crescent and a small angular diameter (10 arc seconds) when it is nearly full. Use the small-angle formula to find the ratio of its maximum to minimum distance from Earth. Is this ratio compatible with the Ptolemaic universe shown in Figure 3b of the Chapter 4 Concept Art: An Ancient Model of the Universe?arrow_forwardGalileo’s telescope showed him that Venus has a large angular diameter (61 arc seconds) when it is a crescent and a small angular diameter (10 arc seconds) when it is nearly full. Use the small-angle formula to find the ratio of its maximum distance to its minim um distance. Is this ratio compatible with the Ptolemaic shown on the right-hand page of Concept Art 4A? (Hint: See Reasoning with Numbers 3-1.)arrow_forward
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