Physics: torsion
Tutoring physics, terms and concepts are important. The tutor mentions torsion. In my previous post I mention torque, which means leverage that can cause a shaft to spin. An example of torque is the case of loosening a bolt with …
Category: physics
Physics: torque
Tutoring physics, fundamental concepts arise. The tutor mentions torque. Torque is essentially leverage applied to an object to start it spinning. A common context is a shaft or axle on bearings; the torque might be supplied by a drive chain, …
Physics: UV: the border case
Self-tutoring about radiation: the tutor mentions UV in terms of ionizing. I mention ionizing vs non-ionizing radiation back in my post from Nov 10. The basic concept is that ionizing radiation can damage molecules in the body without your feeling …
Physics: ionizing vs non-ionizing radiation
Self-tutoring about radiation: the tutor mentions ionizing and non-ionizing. Non-ionizing radiation isn’t powerful enough to dislodge electrons from a molecule or atom. It’s the safer of the two kinds of radiation to be around. Even heat is non-ionizing radiation. Ionizing …
Physics, chemistry: alpha particles from radioactive decay
Self-tutoring about radioactive decay: the tutor wonders what happens to emitted alpha particles. An alpha particle – sometimes written α – can be emitted in various radioactive decay scenarios. U238 → Th234 + α is an example. α particles aren’t …
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Physics: how x-rays are generated
Self-tutoring about physics: the tutor looks at x-ray generation. One type of x-ray generator is a vacuum tube containing a heated plate at one end, and the receiving plate at the opposite end. Around the outside of the tube, the …
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 …
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 …