Question
QUESTION 1
1. A globular cluster is 1 kiloparsec away. What is its parallax?
a. .001 seconds of arc
b. 1 second of arc
c. 1000 seconds of arc
d. .1 seconds of arc

QUESTION 2
1. Suppose you are an astronomer on Jupiter (distance to the Sun = 5 AU). You observe a star with a parallax of 0.1 arcseconds. What is the star's distance?
a. 0.05 pc
b. 0.1 pc
c. 2 pc
d. 5 pc
e. 50 pc

QUESTION 3
1. The nearest star is at a distance of about
a. 1 light year.
b. 1 parsec.
c. 100 parsecs.
d. 1 arcsecond.
e. 1 kiloparsec.

QUESTION 4
1. Which of the following correctly describes the relative distances of the stars and planets? The stars are
a. about 10 times farther away than the nearest planets.
b. about 100 times farther away than the nearest planets.
c. about 100,000 times farther away than the nearest planets.
d. several billion times farther away than the nearest planets.

QUESTION 5
1. By what factor would the apparent brightness of a star increase if an observer moved from 5 parsecs to 1 parsec from the star?
a. 5 times
b. 25 times
c. 125 times
d. 625 times

QUESTION 6
1. What kind of stars are found scattered across the top of the H-R diagram?
a. white dwarfs
b. supergiants
c. giants
d. main sequence stars

QUESTION 7
1. The stars located in the lower left corner of the H-R diagram are
a. white dwarfs.
b. main sequence stars.
c. giants.
d. supergiants.

QUESTION 8
1. If we choose a typical star in the vicinity of the Sun, it will be a
a. spectral class O star.
b. Cepheid variable.
c. neutron star.
d. Lower Main Sequence Red Dwarf.

QUESTION 9
1. An H-R diagram can be made by plotting
a. luminosity versus color.
b. spectral class versus distance.
c. luminosity versus magnitude.
d. temperature versus distance.

QUESTION 10
1. How much fainter is a twelfth magnitude star than an eighth magnitude star?
a. 4 times
b. 10 times
c. 40 times
d. 2.5 times

QUESTION 11
1. Two stars, which differ in magnitude by 5, have a brightness ratio of
a. 5:1.
b. 10:1.
c. 50:1.
d. 100:1.

QUESTION 12
1. How does the brightness of a fourth magnitude star compare with that of a ninth magnitude star?
a. It is 5 times brighter.
b. It is 5 times fainter.
c. It is 100 times brighter.
d. It is 100 times fainter.

QUESTION 13
1. On a certain date, Mars has an apparent magnitude of +1 and Venus has an apparent magnitude of +2. Which is brighter and by how much?
a. Venus is twice as bright as Mars.
b. Venus is 2.5 times as bright as Mars.
c. Mars is twice as bright as Venus.
d. Mars is 2.5 times as bright as Venus.
e. Mars is 100 times as bright as Venus.

QUESTION 14
1. A measurement of the parallax of a star allows us to determine the star's
a. rotation rate.
b. temperature.
c. distance.
d. age.

QUESTION 15
1. If two stars have teh same Absolute Magnitude, then they necessarily have the same...
a. ...luminosity.
b. ...temperature.
c. ...brightness as we perceive it.
d. ...distance.

QUESTION 16
1. Star A has 4 times the radius of star B and is twice as hot. How does the luminosity of star A compare to that of star B?
a. 8 times as great
b. 1024 times as great
c. 16 times as great
d. 256 times as great

QUESTION 17
1. A solar-type star is observed with an apparent magnitude of 12.7. How far away is it? Recall that the absolute magnitude of the Sun is 4.7.
a. 10 parsec
b. 40 parsecs
c. 400 parsecs
d. 1000 parsecs

QUESTION 18
1. Two stars have the same color, but differ by 5 magnitudes in absolute magnitude. What stellar property must be different in the two objects and by how much?
a. The star with the smaller Absolute Magnitude (value) is 10 times closer.
b. The star with the bigger Absolute Magnitude (value) is 10 times closer.
c. The star with the smaller Absolute Magnitude (value) is 10 time bigger in diameter.
d. The star with the bigger Absolute Magnitude (value) is 10 time bigger in diameter.

QUESTION 19
1. Star A is twice as hot as star B. The two stars have the same radius. How does the luminosity of star A compare to that of star B
a. A and B have the same luminosity.
b. A is twice as luminous.
c. A is 4 times as luminous.
d. A is 16 times as luminous.

QUESTION 20
1. The star Capella has an apparent magnitude of 0 and is the same color as the Sun. Its distance is 14 parsecs. Which of the following describes its similarities with the Sun?
a. It must be identical to the Sun.
b. It is less luminous than the Sun, but has the same temperature.
c. It is more luminous than the Sun, but has the same temperature.
d. It is the same luminosity as the Sun, but has a different temperature.

QUESTION 21
1. A star with a trigonometric parallax of .02 arcseconds has a distance of
a. 20 pc.
b. 50 pc.
c. 2.0 light years.
d. 4 kpc.
e. need more information (magnitudes)

QUESTION 22
1. Stars of different spectral classes, O, B, A, F, G, K, M, show differences in the strengths of absorption lines of various elements. These differences are due to
a. differences in the chemical compositions of stars
b. differences in the surface temperatures of stars
c. differences in stellar distances
d. differences in stellar ages

QUESTION 23
1. A star is observed to have extremely strong lines of hydrogen, very weak neutral helium, and weak neutral metals. The spectral type of such a star is closest to
a. O5.
b. B2.
c. A0.
d. K5.
e. M8.

QUESTION 24
1. Consider two stars X and Y with surface temperatures of 3000 K and 10,000 K respectively. Which of the following is true?
a. Star X has less hydrogen.
b. Star Y has less hydrogen.
c. Hydrogen absorption lines will be stronger in star X.
d. Hydrogen absorption lines will be stronger in star Y.

QUESTION 25
1. What spectral class is the next cooler after spectral class F?
a. G
b. B
c. A
d. K

QUESTION 26
1. What spectral class is found between O and A?
a. B
b. F
c. K
d. G

QUESTION 27
1. The hottest stars have spectral class
a. O.
b. A.
c. G.
d. M.

QUESTION 28
1. Which of the following spectral classes is coolest?
a. A
b. B
c. F
d. G
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1. a
2. e
3. b
4. c
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      • Illuminate\Cache\Events\CacheHit (562μs)
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      • Illuminate\Cache\Events\CacheHit (224μs)
      • Illuminate\Cache\Events\CacheHit (432μs)
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      • Illuminate\Cache\Events\CacheHit (206μs)
      • Illuminate\Cache\Events\CacheHit (375μs)
      • Illuminate\Cache\Events\CacheHit (1.07ms)
      • Illuminate\Cache\Events\CacheHit (397μs)
      • Illuminate\Cache\Events\CacheHit (326μs)
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      • Illuminate\Cache\Events\CacheHit (765μs)
      • Illuminate\Cache\Events\CacheHit (213μs)
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      • Illuminate\Cache\Events\CacheHit (189μs)
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      • Illuminate\Cache\Events\CacheHit (262μs)
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      • Illuminate\Cache\Events\CacheHit (180μs)
      • Illuminate\Cache\Events\CacheHit (255μs)
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      • Illuminate\Cache\Events\CacheHit (149μs)
      • Illuminate\Cache\Events\CacheHit (276μs)
      • Illuminate\Cache\Events\CacheHit (270μs)
      • creating: site.layouts.app (571μs)
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      • creating: components.canonical (878μs)
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      • creating: components.open-graph (541μs)
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      • creating: site.headers.header (454μs)
      • composing: site.headers.header (128μs)
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      • creating: components.footer (91μs)
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      • Illuminate\Cache\Events\CacheHit (280μs)
      • Illuminate\Cache\Events\CacheHit (315μs)
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      • Illuminate\Cache\Events\CacheHit (199μs)
      • creating: components.forms.contact-us (435μs)
      • composing: components.forms.contact-us (287μs)
      • creating: components.forms.get-started (279μs)
      • composing: components.forms.get-started (85μs)
      • creating: components.forms.free-tool-download (136μs)
      • composing: components.forms.free-tool-download (66μs)
      • creating: components.forms.claim-free-worksheet (207μs)
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      • creating: components.forms.tutor-subscription-waitlist (1.11ms)
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      • creating: components.forms.tutor-subscription-join (251μs)
      • composing: components.forms.tutor-subscription-join (72μs)
      • creating: components.forms.tutor-support (203μs)
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      • 315 x Illuminate\Cache\Events\CacheHit (30.69%)
        221ms
        16 x Illuminate\Database\Events\StatementPrepared (6.06%)
        43.65ms
        16 x Illuminate\Database\Events\QueryExecuted (3.63%)
        26.15ms
        1 x Illuminate\Routing\Events\Routing (1.34%)
        9.69ms
        7 x Illuminate\Cache\Events\CacheMissed (1.31%)
        9.41ms
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        3.78ms
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        1.11ms
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        1.05ms
        1 x creating: components.canonical (0.12%)
        878μs
        1 x eloquent.booting: App\Models\SubjectCat (0.12%)
        836μs
        8 x eloquent.retrieved: App\Models\SubjectCat (0.1%)
        739μs
        1 x creating: site.layouts.app (0.08%)
        571μs
        1 x creating: components.open-graph (0.08%)
        541μs
        1 x creating: homework.show (0.07%)
        487μs
        1 x creating: site.headers.header (0.06%)
        454μs
        1 x creating: components.breadcrumbs (0.06%)
        446μs
        1 x creating: components.forms.contact-us (0.06%)
        435μs
        1 x Illuminate\Routing\Events\RouteMatched (0.06%)
        404μs
        7 x eloquent.retrieved: App\Models\HomeworkLibrary\HomeworkLibrary (0.05%)
        329μs
        1 x composing: components.forms.contact-us (0.04%)
        287μs
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        279μs
        1 x eloquent.booted: App\Models\HomeworkLibrary\HomeworkLibrary (0.04%)
        278μs
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        256μs
        1 x creating: components.forms.tutor-subscription-join (0.03%)
        251μs
        8 x eloquent.retrieved: App\Models\HomeworkLibrary\HomeworkLibraryFile (0.03%)
        218μs
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        211μs
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        207μs
        1 x creating: components.forms.tutor-support (0.03%)
        203μs
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        172μs
        1 x composing: homework.show (0.02%)
        161μs
        1 x eloquent.booting: App\Models\HomeworkLibrary\HomeworkLibraryFile (0.02%)
        136μs
        1 x creating: components.forms.free-tool-download (0.02%)
        136μs
        1 x eloquent.booting: App\Models\Subject (0.02%)
        132μs
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        128μs
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        109μs
        1 x composing: components.open-graph (0.01%)
        103μs
        1 x composing: components.footer (0.01%)
        98μs
        1 x creating: components.footer (0.01%)
        91μs
        1 x composing: components.forms.get-started (0.01%)
        85μs
        1 x composing: components.forms.tutor-subscription-waitlist (0.01%)
        81μs
        1 x composing: components.forms.claim-free-worksheet (0.01%)
        76μs
        1 x composing: components.forms.tutor-subscription-join (0.01%)
        72μs
        1 x composing: components.forms.tutor-support (0.01%)
        68μs
        1 x composing: components.forms.free-tool-download (0.01%)
        66μs
        1 x eloquent.booted: App\Models\SubjectCat (0.01%)
        60μs
        1 x eloquent.booted: App\Models\HomeworkLibrary\HomeworkLibraryFile (0.01%)
        56μs
        1 x eloquent.booted: App\Models\Subject (0.01%)
        54μs
        1 x composing: site.layouts.app (0%)
        25μs
      14 templates were rendered
      • 1x homework.showshow.blade.phpblade
      • 1x components.breadcrumbsbreadcrumbs.blade.phpblade
      • 1x site.layouts.appapp.blade.phpblade
      • 1x components.canonicalcanonical.blade.phpblade
      • 1x components.open-graphopen-graph.blade.phpblade
      • 1x site.headers.headerheader.blade.phpblade
      • 1x components.footerfooter.blade.phpblade
      • 1x components.forms.contact-uscontact-us.blade.phpblade
      • 1x components.forms.get-startedget-started.blade.phpblade
      • 1x components.forms.free-tool-downloadfree-tool-download.blade.phpblade
      • 1x components.forms.claim-free-worksheetclaim-free-worksheet.blade.phpblade
      • 1x components.forms.tutor-subscription-waitlisttutor-subscription-waitlist.blade.phpblade
      • 1x components.forms.tutor-subscription-jointutor-subscription-join.blade.phpblade
      • 1x components.forms.tutor-supporttutor-support.blade.phpblade
      uri
      GET college-homework-library/{category}/{subject}/{id}
      middleware
      web, utm.parameters
      controller
      App\Http\Controllers\HomeworkLibraryController@show
      namespace
      where
      as
      homework.show
      file
      app/Http/Controllers/HomeworkLibraryController.php:79-176
      16 statements were executed, 4 of which were duplicates, 12 unique. Show only duplicated51.56ms
      • Connection Establishedtwenty4_siteHomeworkLibraryController.php#91
        Backtrace
        • 13. app/Http/Controllers/HomeworkLibraryController.php:91
        • 14. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 15. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 16. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `solutionslibrary` where `status` = 'published' and `price` > 0 and `solutionslibrary`.`id` = '50018' limit 1
        9.14mstwenty4_siteHomeworkLibraryController.php#97
        Bindings
        • 0: published
        • 1: 0
        • 2: 50018
        Backtrace
        • 16. app/Http/Controllers/HomeworkLibraryController.php:97
        • 17. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 18. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 19. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 20. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `subjects` where `subjects`.`id` in (473)
        2.67mstwenty4_siteHomeworkLibraryController.php#97
        Backtrace
        • 21. app/Http/Controllers/HomeworkLibraryController.php:97
        • 22. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 23. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 24. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 25. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` in (50018)
        3.42mstwenty4_siteHomeworkLibraryController.php#97
        Backtrace
        • 21. app/Http/Controllers/HomeworkLibraryController.php:97
        • 22. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 23. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 24. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 25. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `subject_cats` where `subject_cats`.`id` = 42 limit 1
        2.28mstwenty4_siteHomeworkLibrary.php#201
        Bindings
        • 0: 42
        Backtrace
        • 20. app/Models/HomeworkLibrary/HomeworkLibrary.php:201
        • 26. app/Http/Controllers/HomeworkLibraryController.php:105
        • 27. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 28. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 29. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
      • select * from `solutionslibrary` where `id` <> 50018 and `subject` = 473 and `status` = 'published' and `price` > 0 order by RAND() limit 6
        2.54mstwenty4_siteHomeworkLibraryRepository.php#30
        Bindings
        • 0: 50018
        • 1: 473
        • 2: published
        • 3: 0
        Backtrace
        • 14. app/Repositories/HomeworkLibraryRepository.php:30
        • 15. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 16. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 18. app/Repositories/HomeworkLibraryRepository.php:39
        • 19. app/Http/Controllers/HomeworkLibraryController.php:139
      • select * from `subjects` where `subjects`.`id` in (473)
        1.33mstwenty4_siteHomeworkLibraryRepository.php#30
        Backtrace
        • 19. app/Repositories/HomeworkLibraryRepository.php:30
        • 20. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 21. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 23. app/Repositories/HomeworkLibraryRepository.php:39
        • 24. app/Http/Controllers/HomeworkLibraryController.php:139
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 50018 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'question' order by `order` asc, `id` asc
        1.1mstwenty4_siteHomeworkLibrary.php#260
        Bindings
        • 0: 50018
        • 1: question
        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
        • 16. app/Transformers/HomeworkLibrary/HomeworkLibraryTransformer.php:58
        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
        • 20. vendor/league/fractal/src/TransformerAbstract.php:107
        • 21. vendor/league/fractal/src/Scope.php:383
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 50018 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'teaser' order by `order` asc, `id` asc
        800μstwenty4_siteHomeworkLibrary.php#260
        Bindings
        • 0: 50018
        • 1: teaser
        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
        • 16. app/Transformers/HomeworkLibrary/HomeworkLibraryTransformer.php:69
        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
        • 20. vendor/league/fractal/src/TransformerAbstract.php:107
        • 21. vendor/league/fractal/src/Scope.php:383
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 50018 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'solution' order by `order` asc, `id` asc
        1.09mstwenty4_siteHomeworkLibrary.php#260
        Bindings
        • 0: 50018
        • 1: solution
        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
        • 16. app/Transformers/HomeworkLibrary/HomeworkLibraryTransformer.php:80
        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
        • 20. vendor/league/fractal/src/TransformerAbstract.php:107
        • 21. vendor/league/fractal/src/Scope.php:383
      • select * from `subject_cats` where `subject_cats`.`id` = 42 limit 1
        880μstwenty4_siteHomeworkLibrary.php#201
        Bindings
        • 0: 42
        Backtrace
        • 20. app/Models/HomeworkLibrary/HomeworkLibrary.php:201
        • 32. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
        • 33. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
        • 34. vendor/livewire/livewire/src/ComponentConcerns/RendersLivewireComponents.php:69
        • 35. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:70
      • select * from `subject_cats` where `subject_cats`.`id` = 1 limit 1
        1.1mstwenty4_siteSubject.php#100
        Bindings
        • 0: 1
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 3 limit 1
        2.88mstwenty4_siteSubject.php#100
        Bindings
        • 0: 3
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 4 limit 1
        2.61mstwenty4_siteSubject.php#100
        Bindings
        • 0: 4
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 10 limit 1
        5.08mstwenty4_siteSubject.php#100
        Bindings
        • 0: 10
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 33 limit 1
        10.56mstwenty4_siteSubject.php#100
        Bindings
        • 0: 33
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 11 limit 1
        4.08mstwenty4_siteSubject.php#100
        Bindings
        • 0: 11
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      App\Models\HomeworkLibrary\HomeworkLibraryFile
      8HomeworkLibraryFile.php
      App\Models\SubjectCat
      8SubjectCat.php
      App\Models\HomeworkLibrary\HomeworkLibrary
      7HomeworkLibrary.php
      App\Models\Subject
      2Subject.php
          _token
          xK9IBOXyp22YH4W0YvVSoxH9GQP6CDPBGpKN5G8J
          utm_source
          direct
          redirectUrl
          /college-homework-library/Astronomy/Astronomy-Other/50018
          _previous
          array:1 [ "url" => "https://staging.dev.24houranswers.com/college-homework-library/Astronomy/Astro...
          _flash
          array:2 [ "old" => [] "new" => [] ]
          PHPDEBUGBAR_STACK_DATA
          []
          path_info
          /college-homework-library/Astronomy/Astronomy-Other/50018
          status_code
          200
          
          status_text
          OK
          format
          html
          content_type
          text/html; charset=UTF-8
          request_query
          []
          
          request_request
          []
          
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