UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Chapter 13, Problem 31QAP
To determine
The shape of the ball.
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Assuming a circular orbit for the Sun about the center of the Milky Way galaxy, calculate its orbital speed using the following information: The mass of the galaxy is equivalent to a single mass 1.5 X 1011 times that of the Sun (or 3 X 1041 kg ), located 30,000 ly away.
A crew on a spacecraft watches a movie that is two hours long. The spacecraft is moving at high speed through space. Does an Earthbased observer watching the movie screen on the spacecraft through a powerful telescope measure the duration of the movie to be (a) longer than, (b) shorter than, or (c) equal to two hours?
Suppose the proper length of a UFO rocketship is 3475 kilometers,
L. Then how fast is the rocketship moving relative to the Earth?
Parameter value: L = 530 km
Give the value of a = (c - v)/c.
OB:
OA:
9.999x10-3
1.170x10-2
OC:
1.369x10-2
OD:
1.602x10-2
but its length observed by a telescope on Earth is
OE:
OF:
1.874x10-2 2.192x10-2
OG:
2.565x10-2
OH:
3.001x10-2
Chapter 13 Solutions
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
Ch. 13.1 - Prob. 13.1CYUCh. 13.2 - Prob. 13.2CYUCh. 13.3 - Prob. 13.3CYUCh. 13.4 - Prob. 13.4CYUCh. 13.5 - Prob. 13.5CYUCh. 13.6 - Prob. 13.6CYUCh. 13 - Prob. 1QAPCh. 13 - Prob. 2QAPCh. 13 - Prob. 3QAPCh. 13 - Prob. 4QAP
Ch. 13 - Prob. 5QAPCh. 13 - Prob. 6QAPCh. 13 - Prob. 7QAPCh. 13 - Prob. 8QAPCh. 13 - Prob. 9QAPCh. 13 - Prob. 10QAPCh. 13 - Prob. 11QAPCh. 13 - Prob. 12QAPCh. 13 - Prob. 13QAPCh. 13 - Prob. 14QAPCh. 13 - Prob. 15QAPCh. 13 - Prob. 16QAPCh. 13 - Prob. 17QAPCh. 13 - Prob. 18QAPCh. 13 - Prob. 19QAPCh. 13 - Prob. 20QAPCh. 13 - Prob. 21QAPCh. 13 - Prob. 22QAPCh. 13 - Prob. 23QAPCh. 13 - Prob. 24QAPCh. 13 - Prob. 26QAPCh. 13 - Prob. 27QAPCh. 13 - Prob. 28QAPCh. 13 - Prob. 29QAPCh. 13 - Prob. 30QAPCh. 13 - Prob. 31QAPCh. 13 - Prob. 32QAPCh. 13 - Prob. 33QAPCh. 13 - Prob. 35QAPCh. 13 - Prob. 36QAPCh. 13 - Prob. 37QAPCh. 13 - Prob. 38QAPCh. 13 - Prob. 39QAPCh. 13 - Prob. 40QAPCh. 13 - Prob. 41QAPCh. 13 - Prob. 43QAPCh. 13 - Prob. 44QAPCh. 13 - Prob. 45QAP
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- With regard to reference frames, how does general relativity differ from special relativity?arrow_forwardFigure P9.21 shows a jet of material (at the upper right) being ejected by galaxy M87 (at the lower left). Such jets are believed to be evidence of supermassive black holes at the center of a galaxy. Suppose two jets of material from the center of a galaxy are ejected in opposite directions. Both jets move at 0.750c relative to the galaxy center. Determine the speed of one jet relative to the other. Figure P9.21arrow_forwardThe Sun orbits around the center of the Milky Way on a circular orbit with a radius of 8 kpc, and at a speed of about 200 km/s.Suppose that the gravitational field of the Milky Way is dominated by a spherical dark matter halo. What is the mass of the halo within the radius of the solar orbit?arrow_forward
- At perihelion, a planet will have maximum energy of position and maximum energy of motion maximum energy of position and minimum energy of motion maximum energy of motion and minimum energy of position minimum energy of position and minimum energy of motion During most of Voyager 1's two-year journey to Jupiter, the spacecraft was slowing down with respect to the Sun moving with a constant speed with respect to the Sun speeding up with respect to the Sun You are in an elliptical orbit about the Earth and at perigee you fire rocket engines to slow down. Then, as a result: your apogee distance will increase and your perigee distance won't change your apogee distance will decrease and your perigee distance won't change your perigee distance will decrease and your apogee distance won't change your perigee distance will increase and your apogee distance won't…arrow_forwardAccording to Einstein’s two postulates of special relativity: The first postulate states that: All inertial reference frames are equivalent. Explain what is meant by this first postulate.arrow_forwardThe kinetic energy of the ejecta from a supernova explosion is about 10^44 joules. Use the formula for kinetic energy to determine the typical speed at which matter is ejected from a supernova with a mass of 10 Msun. Compare that speed with the Sunʹs orbital speed around our galaxy. Based on your comparison, do you think the galaxyʹs gravity would be strong enough to retain the supernova debris if there were no interstellar medium to slow it down? Explain.arrow_forward
- The Large Magellanic Cloud is a small satellite galaxy that orbits the Milky Way. It is currently orbiting the Milky Way at a distance of about 160,000 light-years from the galactic center at a velocity of about 300 km/s. Use these values in the orbital velocity law to get an estimate of the Milky Wayʹs mass. (The value you obtain is a fairly rough estimate because the orbit of the Large Magellanic Cloud is elliptical, not circular.)arrow_forwardIn a spaceship far from the reaches of gravity, under what conditions could you feel as if the spaceship were stationary on Earth’s surface?arrow_forwardThis is a mathematical problem by converting the distance from the sun to earth then using what ever is given!arrow_forward
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