Category: physics

Physics: estimates

Tutoring physics, approximations often help. The tutor mentions a comparison between exact and approximate. Example 1: Imagine a projectile launched according to the equationh=-4.9t^2 +22t + 15 What would be its height at 3.0 seconds? Solution: h=-4.9(3.0)^2+22(3.0)+15=36.9m or 37m (sig

Physics: what is parallax?

Tutoring physics or general science, the term parallax might arise. The tutor gives a definition. parallax: the phenomenon that the position of an object seems to change as the viewer’s location changes. Source: Gilmour, Lorna (ed). Collins Essential Canadian English

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Physics, chemistry: closed system vs isolated system

Tutoring physics or chemistry, definitions are always important. The tutor compares closed system with isolated system. A closed system cannot lose or gain matter; it cannot exchange matter with the surrounding environment. An isolated system is closed as above, but

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Physics: relativistic mass

Tutoring physics, relativity may arise. The tutor mentions its application to mass. Einstein postulated, in his Special Theory of Relativity, that effective mass increases as velocity does, according to m=mo(1-v2/c2)-0.5 where mo is the rest mass, while c is the

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Science, Climate change: the albedo effect

Tutoring high school science, you may be asked about the albedo effect. The tutor explains it simply. Albedo means loss of incoming radiation due to reflection. Light and heat are examples of radiation (see my previous post). Regarding Earth’s climate,

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Science, physics: what is radiation?

Tutoring science, the concept of radiation arises. The tutor explains it. Radiation is electromagnetic energy travelling from its source. Imagine a radio receiver which you can tune to any frequency. Actual radio station signals will be at the low end,

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Physics: definitions of stress and strain

Tutoring physics, you might encounter the concepts of stress and strain. The tutor defines them. In physics, stress and strain are related, but have very different meanings. A helpful idea is that stress is imposed on an object, while strain

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Physics: what does elastic mean?

Tutoring physics, the term elastic can surface. The tutor discusses it. elastic adj: able to recover its original shape; able to resist permanent deformation after a distorting force is withdrawn. Referring to a rubber band, it’s not called elastic because

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Cooking: temp of a warm object

Cooking means constant self-tutoring. The tutor speculates about the actual temperature of a warm object. Yesterday I took a glass casserole dish of mac and cheese from the oven. Its baking temp was 177C. An hour later, most of the

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Math: how far away is the goose?

Tutoring math, you notice that people like relatable examples. The tutor brings up his observation of a Canada goose. Looking out over a lake in Nanaimo on Sunday morning, I saw an exceptional Canada goose swimming apart from the others.

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