Explore further More information: The gravity tunnel in a non-uniform Earth, Am. J. Phys. 83, 231 (2015); dx.doi.org/10.1119/1.4898780 . On Arxiv: arxiv.org/abs/1308.1342AbstractThis paper examines the gravity tunnel using the internal structure of Earth as ascertained from seismic data. Numerically, it is found that the time taken to fall along the diameter is 38 min, compared to 42 min for a planet with uniform density. The time taken to fall along a straight line between any two points is no longer independent of distance but interpolates between 42 min for short trips and 38 min for long trips. The brachistochrone path (minimizing the time between any two points) is similar in shape to the uniform-density solution but tends to reach a greater maximum depth and takes less time to traverse. Although the assumption of uniform density works well in many cases, the simpler assumption of a constant gravitational field serves as a better approximation to the true results. Are astronauts really weightless? A composite image of the Western hemisphere of the Earth. Credit: NASA (Phys.org)—Alexander Klotz a student at McGill University in Canada has calculated a new answer to the commonly asked physics question, how long would it take a person to fall all the way through the Earth? Instead of the commonly accepted 42 minutes, he claims it is 38. He has published his reasoning, math and conclusions in a paper published in The American Journal of Physics. © 2015 Phys.org Journal information: American Journal of Physics If someone were to drill a hole all the way through the planet, and then somehow manage to fall into it, how long would it take them to arrive on the other side? That is a physics question put to students every year, and those who give it expect the answer to be 42 minutes. But is that answer correct? Klotz says no and has the math to prove it, Science reported.The accepted answer of 42 minutes takes into account the constantly changing impact that gravity will have (and ignoring drag due to the presence of air) on the person falling, becoming less and less of a factor as the center of the Earth is approached then growing stronger and stronger as the person heads “up” against gravity on the other side. It is accepted that the speed attained during the descent on the first half of the journey would be significant enough to cause the person to continue moving against gravity on the other side of the planet, right up until the surface is reached.But Klotz argues that it is time to start taking the different densities of the Earth’s layers into consideration—after all, a lot of research has shown that our planet is a lot denser at the center than at the crust for example—and that of course would have an impact on the person falling through. He has used seismic data to calculate the different densities at different depths and has used that data to give a more accurate answer to the falling man question, stating that it would in fact, take just 38 minutes (and 11 seconds) to fall all the way through, not 42 and (12 seconds).Interestingly, Klotz also notes that if gravity were to be assumed to be at a surface level constant throughout the duration of the trip, the math shows it would take just 38 minutes as well. , Science , arXiv Citation: New way to calculate how long it would take to fall through a hole in the Earth (2015, March 26) retrieved 18 August 2019 from https://phys.org/news/2015-03-fall-hole-earth.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
Recently, Google has made some big changes in how it ranks websites, leaving enterprise companies with the difficult task of reworking their search engine optimization (SEO) strategy across teams and departments.Here is a new SEO approach for enterprise companies, based on my experience working with brands like Coca Cola, Target and IBM, and focusing on the key factors that matter most for search engine results.Results: 17 Ways To Immediately Improve Your Website Traffic1. Rethinking keyword researchSome might argue that keyword research is a dying art, but it’s only become a more sophisticated one. According to Google’s research, roughly 70 percent of the engine’s searches are for synonyms of keywords — not exact keywords — that Google must identify and understand to direct the user to the right place.As a result, Google is now focusing more on intent of the user versus the specific keywords used, turning search into more of a conversation than ever before. For enterprise companies, this means that your SEO experts need to work more closely with the editorial board to develop important topics and themes that are relevant to your audience’s interests, while also looking for ways to create content that’s inclusive of all the different things they might be searching for.2. Adopting new rules for contentDeveloping content for SEO may feel like old hat for your content team, which is why it’s important to bring them up to date on Google’s changing expectations for optimal content. Searchmetrics has identified a number of content factors that affect rank in 2015, including word count, how keywords are distributed, internal links and the use of header and meta-tags.Take a look at Searchmetric’s infographic about the factors (or put someone in charge of reading the full report and presenting the key elements to your content team).3. Embracing the user experience (UX) imperativeUser experience (UX) is another major area that’s influencing search. Cross platform compatibility and site speed have both been shown to affect search rank, but your enterprise teams will also have to pay attention to more nuanced UX variables, like proper content structure and useful internal linking.In the past, optimizing for the search engines and optimizing for website users were sometimes conflicting goals, but Google has moved more toward bridging that gap. Encouraging your teams to evaluate all factors that influence how easily users interact with your website and content will be valuable for both.Related: 5 Must-Use Google Analytics Strategies to Measure SEO Success4. Getting proactive about public relationsLink building strategies — such as listing your site on web directories, posting links on low quality Web 2.0 sites, and leaving links in forum comments — no longer help rank, and can actually cause penalties in Google search. That said, the value of legitimate, high quality citations and mentions is higher than ever before. That’s why it’s important to have at least a few people on your team who are regularly reaching out to publishers and influencers in your industry, building relationships and earning high-quality links through valuable mentions and citations on their platforms.According to data from Moz and BuzzSumo, well-researched content, opinion-informing journalism, long form content, list posts and “Why” posts are all likely to garner a large number of natural citations, as well as social shares.5. Going local Even if your business operates at the national or international level, the biggest mistake an enterprise company can make is to ignore the importance of local search optimization. According to seoClarity’s research, local search results rank number one 93 percent of the time, compared to 25 percent of the time in older analyzes. So if your business has no local presence, it’s increasingly likely it won’t rank high in search results.Having someone in charge of developing and maintaining a local search presence gives enterprise companies a valuable edge. Specifically, assign someone — internally or externally — to update and maintain local listings on your website and on third party platforms such as social media or review sites. 6. Building a social media empireBuilding a social presence has been considered an essential marketing strategy for a while now, but new research from Searchmetrics has shown that Google is now taking social signals (shares, tweets, +1s, etc.) into consideration for search ranks as well. In fact, they found that the number of social signals on Facebook, Google+, Twitter and Pinterest all correlated with higher rank position in Google.For enterprise businesses, this means that building a social media empire across relevant platforms and assigning a team to promote and engage is more important than ever before — not only for building brand awareness, but for remaining competitive in search.As 2016 looms nearer, new data will continue to shed light on which SEO factors your business should focus on. The most important thing you can do is to keep up with this research and actively disseminate new knowledge to important team members throughout your company.How else are you preparing your enterprise-level SEO strategy for 2016? Share your suggestions by leaving a comment below.Related: 6 Essential SEO Strategies to Incorporate in 2016 December 24, 2015 5 min read Free Webinar | Sept. 9: The Entrepreneur’s Playbook for Going Global Opinions expressed by Entrepreneur contributors are their own. Growing a business sometimes requires thinking outside the box. Register Now »