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Click the green button to start and enter the correct answers below
For a given object on a given surface is the coefficient of static friction or kinetic friction greater?
It's takes more force to get something moving than to keep it moving
Centripetal acceleration goes in what direction relative to it's circular path of motion?
The change in velocity of an object moving in a circle at any given point is inward pointing
If they have the same velocity, which object has more momentum: a car or a feather?
That's intuitive, but momentum is mass times velocity
Is every single particle in the universe gravitationally attracted to every other particle in the universe?
No matter the distance between objects, there is some fraction of gravitational force between them
What physicist united the five 'versions' of string theory and introduced M theory?
He's for sure one of the smartest people alive
Do photons have mass?
Photons can be thought of as pure energy
True or False: Scientists will someday be able to construct telescopes powerful enough to see a black hole?
Black holes by definition are not able to be seen
What can a quantity be labeled if it essentially measures volume, and has both direction and magnitude?
If you move 3 steps left, then 9 right, the vector of your displacement is 6 steps right
What does Newton's first law of motion define? (one word answer)
He defined inertia as a property of matter by which it remains at rest or in uniform motion in the same straight line unless acted upon by some external force
The Heisenberg uncertainty principle states that you cannot know what two things about an electron?
This is due to principles of quantum mechanics
What will a force acting on an object (not in equilibrium) cause it to do?
What units is force commonly measured in?
newtons are kilogram meters per second squared, aka mass times acceleration
Which is faster, an object moving at 1 kilometer per hour, or 1 mile per hour
a mile is farther than a kilometer, so moving farther than a kilometer in the same amount of time means greater speed
Does a planet with a radius twice that of earth but the same mass have greater or lesser gravitational attraction?
Essentially the mass is more spread out (less dense), so the planet has less gravitational force
The term 'valence' is mostly associated with what particle?
Valence electrons are the electrons in the outermost s and p orbitals of an atom
About how long would it take to travel from one edge of our galaxy to the other at the speed of light?
The Milky Way is about 100,000 lightyears across.
In the equation E=mc squared, what constant does 'c' stand for?
About what is the speed of light in meters per second? (in a vacuum)
The exact speed is 299,792,458 meters per second
The average distance from the earth to sun is defined as what unit of measurement? (a meter/lightyear/inch)
1 A.U. is equivalent to about 150 million kilometers or 93 million miles
What greek letter is used to symbolize wavelength?
It looks a lot like an upside-down 'Y'
Energy is commonly measured in what units?
Energy is tied in with force and work
In the study of momentum there are two types of collisions. What are they?
They are used to describe whether or not colliding objects 'stick' together
What type of force causes an object to twist or rotate?
torque is a force applied away from an objects center of mass
The number of stars in the milky way is estimated at what power of 10? (hundreds, thousands, millions...)
our galaxy could contain up to 400 billion stars
Angular acceleration is described using what greek letter?
It looks similar to an 'a'
What is the metric equivalent to the english degrees? (not temperature)
a radian is an angle which subtends an arc on a circle equal in length to the radius
How many radians complete a circle in terms of pi?
thats just the way it is
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