Waves
What are the two categories of waves?
Mehcanical & Electromagnet
What are the three types of wave behaviors?
Reflection, Refraction, & Diffraction
What is chemcal energy?
Chemical energy that is stored in the bonds of elements.
In specific heat, what is the unit for the following?
Q, M, C, Delta T
Q= Joules
M= mass
C= J/g*c
Delta T= C
Battery is the best examples of what type of current? why?
DC, Direct Current & current flows in one direction
What is different about electromagnetic & mechcanical waves mediums?
Electromagnetic waves can travel through a vacuum, while mechical can not.
If someone was in a noise canceling room and they are not able to hear any noise outside the door, what type of interference is happening?
Destructive interference
True or False: Convection, conduction & radiation need a medium?
False: Radiation does NOT need a medium.
What makes a material a good conductor?
Having a low specific heat
As current increases voltage does what? What type of relationship is this?
Voltage will increase & direct relationship
Higher
What type of wave behavior causes a pencil to look broken in water?
Refraction
What do you add together to create mechanical energy?
Potential & Kinectic Energy
V= Volts (V)
I= Amps (A)
R= Ohms ( weird upside u symbol)
What is the difference between motors and generator?
Generators transform mechanical energy into electrical energy
Motors transform electrical energy into mechanical energy
What type of wave is a sound wave? How do you tell how much energy is in a sound wave?
Longitudianl & based of how tight the rarefractions are.
When waves BEND around an object what type of wave behavior is this?
Diffraction
Describe conduction, convection, and raditation in simple terms.
Conduction: Direct contect
Convection: Cycle- hot goes up, cool goes down
Radiation: Waves
How do you find the change in temperature?
Final temperature - starting (initial) temperature
What type of circuit will lights stay on, if a path is broken?
Parallel
As density of an object increases, does the speed of sound increase or decrease? Is this a direct or inverse relationship?
Increase & Direct
What is always true about the angle of reflection and the angle of incidence?
They are always the same degree.
You pour hot chocolate into a cup at room temperature and add several marshmellows. Over time, the marshmellows become warmer and they begin to melt.
How is thermal energy moving between the two objects?
Thermal energy is transfered from the hot chocolate to the marshmellows.
A student is comparing two slides of the same size: one made of aluminum (900J/g*C) and the other of plastic (364 J/g*c). The student does not want to get burned. What material would get hotter faster? Which one should the student avoid the longest? Why?
Plastic
Aluminum, b/c the specific heat of the aluminum is higher which cause heat to release slower and to absord heat faster.
What is true about the number of coils in an electromagnet?
The more coils a electromagnet has, the stronger the magnet