# Physic's Flashcards

Terms Definitions
 cos45° 0.7 Atto a -18 Luminous Intensity Candela cd Series ADD R= R1+ R2 Magnification m = -di/do = hi/ho GPE stands for Gravitational Potential Energy Electric charge is always _____. conserved Weight A force that measures the gravitational pull of an object, given by the object's mass times its gravitational acceleration (mg, where g is 9.8 m/s^2 as measured on Earth) Spectral emission must match the film's spectral: sensitivity vector quantity specify magnitude + directionvelocity, acceleration, force To reduce or eliminate infectious organisms on an object? Disinfection anything that occupies space, has mass, and possesses the property of inertia matter CMa = Canis Major's alpha star is Sirius work is zero when force and displacement are perpendicular lever arm perpendicular distance from axis of rotation to point where force is exerted Physical Science The study of matter and energy   (branches into chemistry and physics) projectile object shot thru air with indep. vertical and horizontal motions; after initial thrust, travels thru air only under the force of gravity True or false. The active ingredient in fixer that halts the developing process is acteic acid True Distance has no effect on radiation quality T or F T a charged body confers the opposite charge on a neutral body that comes into its electrical field induction machine makes tasks easier by changing the size or directions of the force Terminal Velocity Drag force equals the driving force (up and down) angular acceleration change in angular velocity divided by the time taken to make the change interference when two water waves come together to occupy the same space. What is the equation for acceleration? (Vf - Vo)/(T) uniform circular motion movement at constant speed around circle with fixed radius The resistance an object has to change in its rotational state of motion is called rotational inertia The resistance an object has to change in its rotational state of motion is called rotational Chapter 11 Rotational Mechanics The average intensity during the entire PRP- both transmit and receive times Temporal average intensity When a gas is liquefied, is the pressure gauge an accurate measure of its contents? No. Kinetic Energy From of energy associated with motion of a body critical mass the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate Paramagnetic Material A material whose atoms have a net magnetic field; under conditions that allow the alignment of the individual magnetic fields, the material exhibits an attraction toward the pole of a magnet Controlled Experiment a test that is designed to include both an experimental group and a control group in which the scientist tests only one variable at a time Accuracy How close something is to a target or goal   (ex. archery) Equilibrium E(sigma) Fx = 0 E(sigma) Fy = [email protected] + [email protected] = 0T2 = [email protected] + [email protected] = [email protected] = W?smaller @ = bigger tension In the absence of air resistance, the angle at which a thrown ball will go the farthest is 45 degrees In the absence of air resistance, the angle at which a thrown ball will go the farthest is Chapter 3 Projectile Motion What happens to venous flow in the legs during inspiration? It decreases Batteries or Chemicals Cells are devices that transform chemical energy into electrical energy, source of direct current that consist of 2 more cells energy power to do work, such as the capacity to move an object by the application of force magnetic fields are created by: 1. moving charges2. currents in wires3. permanent magnets About how many atoms would it take to deposit a single layer on a surface with an area of 3 cm2? (Assume the atom has a cross sectional area of A = 1 10-20 m2.) 3e16 atoms A player catches a ball. Consider the action force to be athe impact of the ball against the player's glove. What is the reaction force: glove against ball The percentage of time that a system is transmitting a pulse? Units? Duty factor. Unitless further at or to a great distance; a long way off; at or to a remote point: How do scientists determine the workings of the universe? By observing, making educated guesses, testing the guesses, and more observing, re-guessing, and more testing, etc. Definitions What type of variable star is used to determine the distances to globular clusters? RR Lyrae stars if mas is increased from 20 mas to 40 mas the patient dose will be doubled Newton's Law of Universal Gravitation law that states that every object in the universe attracts every other object with a force which is directly proportional to the produce of their masses and inversely proportional to the square of the distance between their centers (approximately true when the objects are massive and far apart, absolutely true when objects are point masses), formula: Fg=(G*m1*m2)/s^2 (right side of formula comes to N) When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows A regular straight-line path When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows Chapter 10 Center of Gravity You have constructed an electromagnet. What would increase the number of clips picked up? Increase the number of turns of wire An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? the one on the moon An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? Chapter 4 What moves when a current passes through a wire? The electrons or the atoms that make up the wire. -Matter and energy can not be created nor destroyed.-Matter and energy can be transformed from one state or form to another another.-Total matter and energy in universe is constant. What was, is now, and will forever be. LAW OF CONSERVATION OF MATTER AND ENERGY What happens at stage 1 of a new star being formed? A nebula is formed, hydrogen and dust particles.
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