Db 9 All electrical circuits made by humans are designed to perform one fundamental task: take electrical potential energy (from a battery or a wall socket) and move it to another location. Then, use...

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Db 9


All electrical circuits made by humans are designed to perform one fundamental task: take electrical potential energy (from a battery or a wall socket) and move it to another location. Then, use that energy to do something. Think about a common electrical device you use regularly. Choose a specific function of that device (something it specifically does for you). Into what kind of energy is the circuit transforming the electric potential energy coming from the voltage source (i.e., the battery or wall socket)? Also, on your device does it say how many volts it is using, or how much current is flowing through it?


Challenge: Pick a device OTHER than your smartphone. :-)


Db 10


Magnetic forces are a bit unusual in several respects when compared to other forces in the Universe. For example, since a magnetic force always acts in a direction perpendicular to the motion of an electrically charged object, the magnetic force will not usually speed up or slow down a charged object, but only change its direction of movement (this is often called a "deflection", and follows the right-hand rule given in your textbook). Using a physics textbook, a personal experience, or some other reference, state an example of a magnetic force being used to deflect something. If possible, try to find an example that involves some everyday occurrence or commonly-used device.



Db 12


What we refer to as "colors" are specific wavelengths of light in the visible range that our eyes react to. Since most humans have three types of color sensitive cells in the retina of the eye, we often describe all visible colors as a combination of three "primary" colors: Red (long wavelengths), Green (medium wavelengths), and Blue (short wavelengths). All other colors of the rainbow can be created by mixing these three primary colors. For example:


Red + Green = Yellows & Oranges


Red + Blue = Magentas & Purples


Green + Blue = Cyans & Sky-blues


Choose an object near you and note its most prominent color. What primary color or colors are likely being detected by your eyes to make this object have this color? Are your eyes detecting equal amounts of each primary color, or are some primary colors stronger than others?


Db 11


Before the textbook discusses light, it first introduces waves in general as a physical phenomenon. A wave represents the movement of energy from one location to another. All waves in the Universe require that something vibrates in order to initiate the wave.


Choose a type of wave that occurs in nature, and list what object or objects are vibrating (moving up and down, side to side, back and forth, etc.) in order to generate the wave.


Db 7


Newton's Law of Universal Gravity states that there is a gravitational attraction between any two masses in the universe. For example, let's look at the planet Jupiter using an order-of-magnitude calculation. It has a mass of order 10^27 kg. Its average distance from Earth is of order 10^12 m. I myself have a mass (like most humans) of order 10^2 kg. Using the law of gravitation, this gives an estimate of the gravity between me and Jupiter to be: 10^-6 N (about 1/10,000,000 th of a pound).


Using order-of-magnitude, calculate the gravity between you and an everyday object that you spend a lot of time close to. Is the gravity between you and this object more, less, or about the same as the gravity on you from Jupiter?


Db 6


The principle of Conservation of Energy states that energy in the Universe is never created or destroyed, it can only be moved around when forces do work on objects. In other words, when ever we observe an object to be gaining energy, it must come from some other object, and if we observe an object losing energy, it must go to some other object. Look back at an example of an object changing its motion that you used in a previous DB assignment. In that example, explain why you know that energy was being gained or loss, and what kind of energy it was. Next, explain either where the energy came from, or where it went.



Db5


The idea of "negative Work" may at first sound strange. In everyday speech, you either "do work" or not. Also, in Physics, work is only "done" by forces, which do this work "on" objects. An object itself NEVER does work.


IN THIS THREAD: Using an everyday object, describe a situation where a force is doing negative work on that object. Be sure to specify what force is acting, and how you can be certain the work done is negative.


Db 4


The word "momentum" can have a variety of meanings in our everyday language, but in the realm of Physics it has a singular and very specific meaning and mathematical definition.


IN THIS THREAD: Using an everyday object (it can be either currently moving or at rest), describe at least TWO different ways you can use your own hands or some other tool to CHANGE the momentum of that object. Keep in mind here that momentum is a vector quantity, not just a numerical value.


Db3


Newton's 3rd Law is distinctly different from the first two. Instead of directly describing how forces can affect the acceleration of objects, the 3rd Law states that every force in the Universe comes in a pair (the "action" and the "reaction") that are exactly equal in magnitude but exactly opposite in direction. It is always important to note that the action and reaction affect two DIFFERENT objects. The action and reaction NEVER act on the same object. Look back on the examples you gave in DB Assignments #1 and #2. Pick out TWO different kinds of forces within one or both of these examples. For these two forces, describe the actual "force-pair" that is acting (i.e., What are the two objects and how are they applying equal and opposite forces on one another?).


Db 2


When it comes to Newton's 1st Law, the two situations it describes are not equally understandable by many beginning Physics students. One part (an object at rest stays at rest) seems straight forward enough. If an object is just "sitting there" and I do not disturb it in any way, it is not going to suddenly start moving (i.e., suddenly accelerate from rest).


However, the second part of the 1st Law (any object in constant motion stays in constant motion) can sometimes be tricky to grasp. Don't all objects "left alone" eventually slow to rest? Or, are such objects actually being "left alone"? The key is to consider the NET FORCE (the sum of all forces) on an object rather than any single acting force.


IN THIS THREAD: Please give an example in your personal experience of an object in constant motion (i.e., moving but NOT accelerating in any way). Give a description of all the forces acting on it as it moves, and explain why, despite having forces act on it, it still does NOT accelerate. As before, no two examples given below can be identical.



Db1


The measurement and description of motion serves as the foundation of Physics. Nothing in the Universe can ever "happen" without motion being involved. Even a single human thought requires an electrical signal to move across the brain. So, for our first "official" Discussion Board assignment, the topic is a key concept of motion (as well as a frequent point of confusion): the difference between "velocity" and "acceleration".


IN THIS THREAD: Please give an everyday example in your personal experience of an object in motion. It can be from where you work, live, often visit, etc. In a few sentences, describe how you can tell when the object has a non-zero velocity and when it has a non-zero acceleration (try to be as specific as you can). You are not allowed to repeat an example already given, so the students who answer early may not need to go out of their way to find a good example. That said, feel free to be creative. :-)

Answered 6 days AfterApr 24, 2022

Answer To: Db 9 All electrical circuits made by humans are designed to perform one fundamental task: take...

Dr Shweta answered on Apr 30 2022
89 Votes
Solutions
1. Db 9
Electric fan- helps in the circulation of air in room
It converts electrical e
nergy to mechanical energy
It uses 110 volts
Current in fan is 0.5-1 amp
2. Db 10
Magnetic force uses to deflect the coils and diaphragms in a speaker
3. Db 12
Brinjal - purple in colour.
To see this our eyes, detect green and blue colour.
Yes, our eyes can see all primary colours equally.
4. Db 11
Sound waves...
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