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About David

Physics homework becomes easier when you understand the 'why' behind
formulas. I focus on conceptual clarity first.

Areas of Expertise

Classical Physics Quantum Mechanics

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-- Classical Physics

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Proven Track Record

512+ completed orders with 96% on-time delivery

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Expert Knowledge

Master's in Physics, Penn State University with specialized expertise

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Necessary (15)

Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

Name	Provider	Purpose	Maximum Storage Duration	Type
AWSALB [x2]	5staressays.com app.5staressays.com track.5staressays.com	Registers which server-cluster is serving the visitor. This is used in context with load balancing, in order to optimize user experience.	7 days	HTTP Cookie
AWSALBCORS [x2]	5staressays.com app.5staressays.com track.5staressays.com	Registers which server-cluster is serving the visitor. This is used in context with load balancing, in order to optimize user experience.	7 days	HTTP Cookie
__mp_opt_in_out_#	mxpl.5staressays.com	Stores the user's cookie consent state for the current domain	Session	HTTP Cookie
_cfuvid	5staressays.com	This cookie is a part of the services provided by Cloudflare - including load-balancing, deliverance of website content and serving DNS connection for website operators.	Session	HTTP Cookie
CookieConsent [x2]	Cookiebot metrics.5staressays.com	Stores the user's cookie consent state for the current domain	1 year	HTTP Cookie
_GRECAPTCHA	Google	Pending	180 days	HTTP Cookie
rc::a	Google	This cookie is used to distinguish between humans and bots. This is beneficial for the website, in order to make valid reports on the use of their website.	Persistent	HTML Local Storage
rc::b	Google	This cookie is used to distinguish between humans and bots.	Session	HTML Local Storage
rc::c	Google	This cookie is used to distinguish between humans and bots.	Session	HTML Local Storage
rc::f	Google	This cookie is used to distinguish between humans and bots.	Persistent	HTML Local Storage
1.gif	Cookiebot	Used to count the number of sessions to the website, necessary for optimizing CMP product delivery.	Session	Pixel Tracker
token	track.5staressays.com	Ensures visitor browsing-security by preventing cross-site request forgery. This cookie is essential for the security of the website and visitor.	Session	HTTP Cookie

Preferences (5)

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Name	Provider	Purpose	Maximum Storage Duration	Type
intercom-intercom-state-*	5staressays.com Intercom	Remembers whether the user has minimized or closed chat-box or pop-up messages on the website.	Persistent	HTML Local Storage
intercom-device-id-#	Intercom	Sets a specific ID for the user which ensures the integrity of the website's chat function.	271 days	HTTP Cookie
intercom-id-#	Intercom	Allows the website to recognise the visitor, in order to optimize the chat-box functionality.	271 days	HTTP Cookie
intercom-session-#	Intercom	Sets a specific ID for the user which ensures the integrity of the website's chat function.	7 days	HTTP Cookie

Statistics (13)

Statistic cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously.

Name	Provider	Purpose	Maximum Storage Duration	Type
_clck	Microsoft	Collects data on the user's navigation and behavior on the website. This is used to compile statistical and heatmaps for the website owner.	1 year	HTTP Cookie
_clsk	Microsoft	Registers statistical data on users' behaviour on the website. Used for internal analytics by the website operator.	1 day	HTTP Cookie
_dd_s	www.datadoghq-browser-agent.com	Registers the website's speed and performance. This function can be used in context with statistics and load-balancing.	1 day	HTTP Cookie
_vis_opt_s	5staressays.com	Used by Visual Website Optimizer to determine if the visitor is participating in a design experiment.	100 days	HTTP Cookie
_vis_opt_test_cookie	5staressays.com	Used to check if the user's browser supports cookies.	Session	HTTP Cookie
_vwo_ds	5staressays.com	Collects data on the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded with the purpose of generating reports for optimising the website content.	30 days	HTTP Cookie
_vwo_sn	5staressays.com	Collects statistics on the visitor's visits to the website, such as the number of visits, average time spent on the website and what pages have been read.	1 day	HTTP Cookie
_vwo_uuid	5staressays.com	Used by Visual Website Optimizer to ensure that the same user interface variant is displayed for each visit, if the user is participating in a design experiment.	1 year	HTTP Cookie
_vwo_uuid_v2	5staressays.com	This cookie is set to make split-tests on the website, which optimizes the website's relevance towards the visitor – the cookie can also be set to improve the visitor's experience on a website.	1 year	HTTP Cookie
dd_cookie_test_#	www.datadoghq-browser-agent.com	Registers data on visitors' website-behaviour. This is used for internal analysis and website optimization.	1 day	HTTP Cookie
vwoSn	5staressays.com	This cookie is set to make split-tests on the website, which optimizes the website's relevance towards the visitor – the cookie can also be set to improve the visitor's experience on a website.	Persistent	HTML Local Storage
eu01/v.gif	VWO	This cookie is used by the website's operator in context with multi-variate testing. This is a tool used to combine or change content on the website. This allows the website to find the best variation/edition of the site.	Session	Pixel Tracker
vwo_apm_sent	VWO	Pending	Persistent	HTML Local Storage

Marketing (24)

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Name	Provider	Purpose	Maximum Storage Duration	Type
_fbp	5staressays.com	Used by Facebook to deliver a series of advertisement products such as real time bidding from third party advertisers.	3 months	HTTP Cookie
_ga	metrics.5staressays.com	Used to send data to Google Analytics about the visitor's device and behavior. Tracks the visitor across devices and marketing channels.	2 years	HTTP Cookie
_ga_#	metrics.5staressays.com	Used to send data to Google Analytics about the visitor's device and behavior. Tracks the visitor across devices and marketing channels.	2 years	HTTP Cookie
_ttp	5staressays.com	Used by the social networking service, TikTok, for tracking the use of embedded services.	13 months	HTTP Cookie
mp_#_mixpanel	mxpl.5staressays.com	Pending	1 year	HTTP Cookie
NID	Google	Registers a unique ID that identifies a returning user's device. The ID is used for targeted ads.	6 months	HTTP Cookie
__mpq_#_#	mxpl.5staressays.com	Collects data on user behaviour and interaction in order to optimize the website and make advertisement on the website more relevant.	Persistent	HTML Local Storage
__Secure-ROLLOUT_TOKEN	YouTube	Pending	180 days	HTTP Cookie
__Secure-YEC	YouTube	Stores the user's video player preferences using embedded YouTube video	Session	HTTP Cookie
LAST_RESULT_ENTRY_KEY	YouTube	Used to track user's interaction with embedded content.	Session	HTTP Cookie
LogsDatabase/V2/v#\|\|LogsRequestsStore	YouTube	Used to track user's interaction with embedded content.	Persistent	IndexedDB
remote_sid	YouTube	Necessary for the implementation and functionality of YouTube video-content on the website.	Session	HTTP Cookie
TESTCOOKIESENABLED	YouTube	Used to track user's interaction with embedded content.	1 day	HTTP Cookie
VISITOR_INFO1_LIVE	YouTube	Tries to estimate the users' bandwidth on pages with integrated YouTube videos.	180 days	HTTP Cookie
YSC	YouTube	Registers a unique ID to keep statistics of what videos from YouTube the user has seen.	Session	HTTP Cookie
yt/idb::LAST_RESULT_ENTRY_KEY	YouTube	Used to track user's interaction with embedded content.	Persistent	HTML Local Storage
YtIdbMeta#databases	YouTube	Used to track user's interaction with embedded content.	Persistent	IndexedDB
yt-remote-cast-available	YouTube	Stores the user's video player preferences using embedded YouTube video	Session	HTML Local Storage
yt-remote-cast-installed	YouTube	Stores the user's video player preferences using embedded YouTube video	Session	HTML Local Storage
yt-remote-connected-devices	YouTube	Stores the user's video player preferences using embedded YouTube video	Persistent	HTML Local Storage
yt-remote-device-id	YouTube	Stores the user's video player preferences using embedded YouTube video	Persistent	HTML Local Storage
yt-remote-fast-check-period	YouTube	Stores the user's video player preferences using embedded YouTube video	Session	HTML Local Storage
yt-remote-session-app	YouTube	Stores the user's video player preferences using embedded YouTube video	Session	HTML Local Storage
yt-remote-session-name	YouTube	Stores the user's video player preferences using embedded YouTube video	Session	HTML Local Storage

David T.