Please answer the following questions clearly:
(ii) Why would a 15 year old male need more calcium than a 30 year old male?
(iii) Why does a 25 year old pregnant female need more protein than a non-pregnant 25 year old female?
1b) A hammer hits a nail, what is the size of the force acting on it?
1c) A lift is moving upwards, and slowing down. Compare the forces (tension and weight) about what would happen now.
1d) Describe why a 15 year old female needs more iron than a 15 year male.
1e) When Iron is mixed with hydrocholic acid, what do you get?
1f) A candle burns, the formula for the reaction is --> Candle Wax + Oxygen = Carbon Dioxide + Water, where did the Oxygen come from?
2a) Two 16 year old males weigh the same weight. Explain why they need different amounts of energy.
2b) When Iron is combined with Sulphur to produce the compound Iron Sulphide, what can they both not do, once a compund?
Thanks for helping! x
Science - SraJMcGin, Monday, February 2, 2009 at 1:41pm
Some of these can be answered with common sense. For example a youngster that is still growing needs more nutrients than an adult.
Here is a lesson in how to search on the Internet:
At this webpage, you can go immediately to the search sites (first three columns across the top) -- or even better you can scroll down until you see the section called HOW TO SEARCH THE INTERNET. Those are the links to start with. You'll not only learn how to come up with good search terms, but also how to evaluate the webpages you get as results. Some will be good and others will be garbage. You need to know how to tell the difference.
My favorite way to search is to go to Google's advanced search page http://www.google.com/advanced_search?hl=en and put my search words or phrases into the first or second search box (either "all the words" or "exact phrase"). However, there many other strategies for searching you can use, and the HOW TO SEARCH THE INTERNET section will help you best.
Learning to use Google or other search engines can save you time and help you learn to find information efficiently. Here are some websites that can teach you how:
... and one to help you judge whether a particular website's information is worth your time:
Happy searching. Thanks to Writeacher.