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It is an American tradition to roast turkey to celebrate Thanksgiving! In each of the many different ways to make a nice roast turkey, physics always gets involved:) USDA recommends to cook the inner parts of a turkey to at least 165 °F to kill dangerous bacteria. To realize this inner temperature without overcooking the […]
2022-11-23 Physics in roasting turkey: Happy Thanksgiving! Read More »
The size/diameter of our human hair is very tiny, around 10-100 μm. In other words, a regular #2 pencil is about equivalent in size to a bunch of over 10 thousand hairs!!! To measure such a tiny thing, most of regular tools don’t help at all! However, spectroscopy can do a fantastic job here! What
2022-11-8 How to find the size/diameter of a human hair? Read More »
Happy 2022! We are in a new year:) Have you ever thought about why there are ~365 days in a year? ~30 days in a month? 24 hours in a day? Actually, these facts can be all related to astronomical events. One year is the time used for the earth to move by a circle
2022-1-4 Happy new year! Read More »
Q: Can you have a Net force that is not equal to zero going in both directions? Or is it that you can only have a net force in one direction while the other will have a net force equal to zero? If you can, what would be an example of one? Talking about forces
2021-11-1 Non-zero net force in both directions? Read More »
Q: Theta or Phi? When do I use theta to find the angel and when do I use phi to find the angle for a vector? A: Theta and Phi are defined as the angles of vector versus different axes, depending on the diagram in problems. Theta is the most popular angle of vector versus
2021-10-24 What angle to use for a vector? Read More »
Q: When a block attached to the string is placed on a ramp (an inclined surface). You said in class that if the block is staic there was no friction because there was tension force from the string. Let us say the block was slowly moving downward by releasing the stringslowly, would there be a
2021-10-14 Friction and Tension on object at a same time? Read More »
Q: How can an object have zero velocity and still be speeding up/slowing down?If an object has zero velocity, and thus is not moving, how can it be speeding up or slowing down? A: Velocity here is Instantaneous Velocity (Velocity at a time instant) and motion is a process for a certain time interval, so
2021-10-8 Is Zero Velocity “Static”? Read More »
Hooray! “Physics Doable” Android App is live! It has all the functions of the website! Please feel free to download and install from https://www.physicsdoable.com/app/ The iOS App development is struggling with some hassles:( Wish I could get the problem solved soon!
Physics Doable Android App is live! Read More »
Q: Do the isothermal, isochoric, and isobaric relationships apply to points on the p-V diagram that are not directly connected? In the lab of Thermo Cycle (see figure), states 1 and 3 sit on an isotherm curve. Can I use the isothermal relationship, (p1)(V1)=(p3)(V3), even though there is a step in between these two points
2021-6-2 Highlights of Question&Answer Read More »
Q: When looking at the formula Eth=W+Q, what is the difference between Work and Heat? Aren’t they both energy? If possible, please provide an example of work vs heat. A: Work (W) and heat (Q) are the 2 ways to change the thermal energy of a system. They are different. For Work, macro force/pressure and
2021-5-30 Highlights of Question&Answer Read More »
