TA: Caleb Price
Homework 7 Essay
A railcar travels at 3/4 the speed of light, and your friend happens to be on it. As you stand on the ground
watching your friend pass by, lightning bolts strike both the front and the back of
TA: Caleb Price
Homework 6 Essay
Three spheres of the exact same volume are submerged in a tub of water. After the spheres are lined up,
they are released. The spheres are made of plastic with the same density as water, ice,
Shared Sources of Knowledge:
authority, intuition, reason, and sensory data
trusting the knowledge possessed by another person or some other source and accepting it as
true, even though you yourself have not figured it out.
aka- an acc
Physical Science 100 Midterm
1. 4 sources of knowledge
1. 6 self-evident truths
things happen on the
Newton's First law of motion
Every object at rest, or in uniform motion, will remain in that state of motion unless compelled to do otherwise by forces
acting upon it.
motion at constant speed in a straig
Chapter 10 Terms
a disturbance in matter that carries energy from one place to another
The place where a molecule will reside when no unbalanced forces are acting upon it.
A wave in which the mol
Chapter 19 Terms
chemical matter that has a defined, unchanging chemical composition.
Matter that contains only one kind of atom.
Matter that contains tow or more atoms in a fixed, definite proportion. New compounds
Chapter 20 & 21 Terms
group 18; nonmetals; 8 electrons in its outermost energy level; unreactive; colorless odorless; gases at room temperature
Standing electron probability waves for molecules. These standing wave shape
Shared sources of knowledge
Strength: Dont have to experience it ourselves; learn quicker
Weakness: When 2 authority figures contradict each other
Strength: Outside of our senses; from the ultimate authority?
Periodic Table of elements
Groups are vertical
Elements in a group are similar to each other
Each element gains a charge as the periodic table goes down
Generally, as you move across the table in a single period, do the atoms get bigger or
How are semiconductors unlike metals?
Semiconductors resistivity decreases as the temperature increases
Metals become more resistive as the temperature increases
Since the molecules in the metals jiggle more when the temperature
Chemical reactions- Why do they occur?
Ex. Hydrogen and oxygen combine to make water. Why?
Lower energy is why this happens
Order and disorder
Does the systems disorder increase or decrease? (O2 and H2 changing into H2O)
Gasses are more d
Occurs in some solids (diamond, carbon, silicon, etc.)
Lots and lots of molecules, mostly organic molecules, bond covalently
Electronegativity and bond polarity
Although there is an equal number of electrons, certain elem
How do we know light is a particle?
The photoelectric effect
How do we know light is a wave?
Doesnt work if the electroscope is positively charged because there are no
electrons for the UV rays to knock off.
How do we know that light is a wave?
Laser interference pattern
Energy in a normal wave is proportional to amplitude (like the loudness of sound)
Light energy is NOT proportional to amplitude, unlike every other normal wave!
Rubber rods repel each other
Rubber rod and glass rod attract
The reason our hair stands up is because our body is filled with extra charges and the hair
is trying to get away
Through Abrams experiment, he learned that atoms have positive and ne
What are waves?
Disturbances in a medium that carries energy
What kinds of waves are there?
Shear (transverse) or longitudinal (compression)
Traveling or standing
How are they characterized?
Wavelength, amplitude, frequency
What makes a sound l
When 2 cars crash into each other and fuse together, the velocity becomes half and the
momentum isnt conserved.
Since the mass is doubled (two cars now), the velocity is cut in half.
If we are spinning in a chair and hold out our arms while
What are atoms made of? (Based on J.J. Thompsons experiment)
Negative pieces (electrons) are always the same
Positive pieces are different for each gas (but all the same for a given gas)
There are positive and negative pieces
The mass o
The more crooked the chains, the less inter-chain bonding
The longer the chain, the more inter-chain bonding
14.1 lbs of Plutonium-239
Plume went up about 11 miles
How does it work?
Splitting nuclei to create a
Hydrogen makes up 75% of the matter in the universe
Clouds of hydrogen in the interstellar medium
Cloudy areas are emission nebulae
Dark areas are dark nebulae
Without supernovas (stars that explode near the end of their life cycle), there woul
Brittle plates floating on a molten layer
Not exclusively oceanic (denser) or continental (older)
Oceanic layer recycles
Different plate boundaries
Creates mountain belts
-Authority, Intuition, Reason, Sensory Data
-Order of the Scientific method: Hypothesis, Theory, Law, Model
-6 Self Evident Truths: Existence, Causality, Position symmetry, time symmetry, principle of non
contradiction, occams razor
Electrons are shared by a few
More localized than metallic bonds
Electronegativity- how hard an atom pulls on its electrons
Increases on periodic table as you go up and to the right
PHYSICAL SCIENCE EXAM 3 REVIEW
I. Chemical bonds
a. Ionic (super fancy restaurant)
i. Electrons are permanently transferred
1. Ex: Na + Cl form a structure called network matter.
2. All ionic substances are network matter
ii. Metal +non metal.
Which of the following is not an interaction caused by the strong force?
Protons attracting electrons
Strong force only works between neutrons and protons
Why do you think neutrons were discovered after protons?
Why does the moon have older rocks t