21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 18.4, Problem 18.4CYU
To determine
If black hole mass is doubled, the event horizon would become.
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a. What is the event horizon radius [m] for the sun if it were to collapse to a Schwarzschild black hole? (Msun = 1.99 x 1030kg).
b. Would earth’s orbit be altered if this were to occur (T/F).
An isolated black hole in space would be difficult to detect because
a.
there would be no light source nearby.
b.
it would not be rotating rapidly.
c.
it would be stationary.
d.
very little matter would be falling into it.
e.
there would be very few stars behind it whose light it could block out.
a. Find the acceleration due to gravity at the surface of a neutron star of mass 1.5 solar masses and having a radius of R = 10.0 km.
b. Find the weight of a 0.120-kg baseball on the surface of this star.
c. Assume the equation U = mgh applies, and calculate the energy that a 70.0-kg person would expend climbing a 1.00-cm-tall mountain on the neutron star.
d. Find the speed needed by a small satellite to maintain a circular orbit with a radius of 2R around the neutron star.
Chapter 18 Solutions
21st Century Astronomy
Ch. 18.1 - Prob. 18.1CYUCh. 18.2 - Prob. 18.2CYUCh. 18.3 - Prob. 18.3CYUCh. 18.4 - Prob. 18.4CYUCh. 18 - Prob. 1QPCh. 18 - Prob. 2QPCh. 18 - Prob. 3QPCh. 18 - Prob. 4QPCh. 18 - Prob. 5QPCh. 18 - Prob. 6QP
Ch. 18 - Prob. 7QPCh. 18 - Prob. 8QPCh. 18 - Prob. 9QPCh. 18 - Prob. 10QPCh. 18 - Prob. 11QPCh. 18 - Prob. 12QPCh. 18 - Prob. 13QPCh. 18 - Prob. 14QPCh. 18 - Prob. 15QPCh. 18 - Prob. 16QPCh. 18 - Prob. 17QPCh. 18 - Prob. 18QPCh. 18 - Prob. 19QPCh. 18 - Prob. 20QPCh. 18 - Prob. 21QPCh. 18 - Prob. 22QPCh. 18 - Prob. 23QPCh. 18 - Prob. 24QPCh. 18 - Prob. 25QPCh. 18 - Prob. 26QPCh. 18 - Prob. 27QPCh. 18 - Prob. 28QPCh. 18 - Prob. 29QPCh. 18 - Prob. 30QPCh. 18 - Prob. 31QPCh. 18 - Prob. 32QPCh. 18 - Prob. 33QPCh. 18 - Prob. 34QPCh. 18 - Prob. 35QPCh. 18 - Prob. 36QPCh. 18 - Prob. 37QPCh. 18 - Prob. 38QPCh. 18 - Prob. 39QPCh. 18 - Prob. 40QPCh. 18 - Prob. 41QPCh. 18 - Prob. 42QPCh. 18 - Prob. 43QPCh. 18 - Prob. 44QPCh. 18 - Prob. 45QP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Show that the velocity of a star orbiting its galaxy in a circular oibit is inversely proportional to the square root of its orbital radius, assuming the mass of the stars inside its orbit acts like a single mass at the center of the galaxy. You may use an equation from a previous chapter to support your conclusion, but you must justify its use and define all terms used.arrow_forwardIs the event horizon of a black hole the actual physical surface of the object?arrow_forwardBlack hole candidates are conspicuous by their continuous or flickering emission of a. infrared light. b. ultraviolet light. c. gamma rays. d. X rays. e. all of the above.arrow_forward
- 1. Determine the radius of the event horizon if a star of mass 11 x 1030 kg explodes into a supernova and collapse in on it to form a black hole.arrow_forwardThe search for black holes involves searching for a. single stars that emit large numbers of X rays. b. X ray binaries where the compact companion has a mass in excess of 3 M. c. large spherical regions from which no light is detected. d. pulsars with periods less than one millisecond. e. pulsars that are orbited by planets.arrow_forward10. What is the event horizon radius [m] for the sun if it were to collapse to a Schwarzschild black hole? (Msun = 1.99 x 1030kg). Would earth’s orbit be altered if this were to occur (although it would be a heck of a lot colder) (T/F).arrow_forward
- 4. If the Sun suddenly became a black hole, how would the Earth's orbit be affected? Explain.arrow_forward129. In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun but occu- pying less space than our moon. Suppose that one of these black holes has a mass of 1 × 10° suns and a radius equal to one-half the radius of our moon. What is its density in grams per cubic centimeter? The mass of the sun is 2.0 × 10º kg, and the radius of the moon is 2.16 × 10° mi. (Volume of a 4 sphere =Tr.) 3arrow_forwardThe escape velocity at the event horizon of a black hole is 3×108 m/s, i.e., the velocity of light. What is the mass of the black hole if the distance from its centre to the event horizon is 18km? a) 12.15 x 10-30 kg b) 12.15 x 1030 kg c) Infinity d) Cannot be determinedarrow_forward
- A black hole has an event horizon radius of 5.00××1033 m. a) What is its mass? b) Determine the gravitational acceleration it produces at a distance of 5.01××1033 m from its center. c) Determine the escape speed at a distance of 5.01××1033 m from its center.arrow_forward_____________________ occurs when light travels out of a gravitational field, loses energy, and its wavelength grows longer. a. A magnetar b. Time dilation c. A gravitational redshift d. An X ray burst e. A pulsar windarrow_forward2. What is the best way to stop being pulled into a black hole? a.) Fire rockets continuously. b.) Invent anti-gravity. c.) Go into orbit, rely on centrifugal force. d.) Reduce the mass of the ship by throwing almost everything overboard. e.) Fall into the black hole and get frozen at its horizon.arrow_forward
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