# Shared Flashcard Set

## Details

Physics (2nd semester)
Physics 2nd semester study questions for final exam.
65
Physics
05/21/2014

Term
 Center of Gravity
Definition
 Located at center of mass
Term
 What happens if the CG extends beyond its base?
Definition
 The object will topple over.
Term
 Where does an object rotate?
Definition
 It follows a straight line, the center of gravity stays on the line.
Term
 What is torque?
Definition
 Force in a rotating path (circular motion)
Term
 What is the formula in order to find torque?
Definition
 Force x Lever Arm Distance
Term
 What is the formula for balancing torque?
Definition
 Force x Distance / Distance
Term
 What happens if you add length onto an object. (Adding length to a wrench)
Definition
 There is greater torque produced when the force and lever arm are large.
Term
 Rotational Inertia
Definition
 An object that can move in an arch or circle.
Term
 Rotational inertia depends on the distance of mass from the what?
Definition
 Axis.  (Harder to rotate weight when weights are further from the center)
Term
 What rolls faster? A solid or hollow wheel?
Definition
 A solid. More mass
Term
 What happens when you're in the air and you pull your body closer?
Definition
 You spin more/ go faster
Term
 What is the equation for pressure?
Definition
 pressure= force/area
Term
 What is pressure?
Definition
 A force acting on a specific amount of surface area.
Term
 Given the length of the weightless beam to be 120 inches, and the weight at A to be 600 pounds with the center of gravity to be located 4 feet to the right of A. Find the weight necessary to produce equilibrium at B.
Definition
 400
Term
 The more area the ______ pressure?
Definition
 Less
Term
 An industrial container is holding 200N of water. The area of the inside of the bottom of the container is 2 square meters. What is the pressure?
Definition
 100
Term
 What is a substance that flows and exerts pressure?
Definition
 Fluids
Term
 The longer you make the radius of an object that moves in a circular path, what affect does it have?
Definition
 Rotational Inertia
Term
 The resistance an object has to change in its rotational state of motion is called rotational?
Definition
 Inertia (rotational inertia)
Term
 A 5000N car is lifted by a hydraulic piston of an area 2000 square cm. How much force on a 20 square cm piston is needed to lift the car?
Definition
 50 N
Term
 If you put a rock into a glass of water what happens?
Definition
 The water in the glass will rise because the stone replaces the water.
Term
 If an object has a density greater than the density of water, what happens to the object?
Definition
 It sinks.
Term
 What is buoyancy?
Definition
 The apparent loss of weight of objects when submerged into a liquid.
Term
 The weight of a floating object equals the weight of what?
Definition
 The water displaced by the submerged part.
Term
 What sinks, floats, neither?
Definition
 Rock (something heavier than water)  Wood (something lighter than water) Fish (equal to water)
Term
 Pascal's Principle
Definition
 Changes in pressure at any point in an enclosed fluid at rest are transmitted undiminished to all points in the fluid and act in all directions.
Term
 Bernoulli's Principle
Definition
 When the speed of a fluid increases,the pressure drops.
Term
 What are the 3 mechanics?
Definition
 Buoyancy, hydraulics, pressure
Term
 What are the 4 dynamics?
Definition
 Aerodynamics, Hydrodynamics, Bernoulli's principle, Traffic engineering
Term
 What is the average Kinetic Energy of all particles?
Definition
 Temperature
Term
 Is there more kinetic energy in a bathtub of warm water or small cup of high temperature?
Definition
 the bathtub
Term
 The transfer of thermal energy is what?
Definition
 Heat
Term
 What is thermal contact?
Definition
 When heat flows from one object to another.
Term
 Absorb, hold, transfer Thermal Energy
Definition
 CsP (specific heat capacity)
Term
 The heating process occuring by currents in a fluid is...
Definition
 Convection (without direct contact)
Term
 What type of thermal energy transfer requires a physical contact?
Definition
 Conduction (high to low)
Term
Definition
 Through no medium. electromagnetic energies. emitted from a source that transfers energy from high to low through a vaccuum.
Term
 What are the 3 thermal energy transfers?
Definition
Term
 What is a conductor? What is an insulator?
Definition
 Conductor- Transfers heat quickly Insulator- Transfers heat slowly
Term
 Newton's law of heating/cooling
Definition
 change in temperature. An object will become the same temperature as surroundings. How fast/slow something will heat up/cool down.
Term
 Equation for Calories
Definition
 Mass x Change in Temperature
Term
 Transverse Wave
Definition
 Transports energy by vibrating matter perpendicular to the energy direction. |---energy matter
Term
 Longitudinal Wave
Definition
 Transports energy by vibrating matter parallel to the energy direction. --> matter --> energy
Term
 Wave Speed Formula
Definition
 Wave length (lambda) x Frequency
Term
 Name a kind of wave that isn’t a transverse wave.
Definition
 longitudinal wave - sound wave is an example of this
Term
 Taking 10g of water and increasing the temperature by 56 degrees requires how many calories of energy?
Definition
 560
Term
 When two or more waves are at the same place at the same time, the resulting effect is called what?
Definition
 Interference
Term
 The distance between successive, identical parts of a wave is called its?
Definition
 Wave length
Term
 What is the change in frequency due to motion of a wave source?
Definition
 The doppler effect (like a firetruck wizzing by and it sounds differently once it passes)
Term
 What scale is used to measure the intensity of sound?
Definition
 Decibels
Term
 What is force at its natural vibration?
Definition
 Resonance (think of gel on drums)
Term
 The energy that travels in a wave that is partly electric and partly magnetic.
Definition
 Electromagnetic Wave (infared,gamma,UV)
Term
 What radiation is the highest frequency on the electromagnetic spectrum?
Definition
 Gamma
Term
 What is the electromagnetic scale?
Definition
 Low                                                       High Radio  Micro  Infared  VL  UV X-Ray Gamma
Term
 What is transparency?
Definition
 It allows the energy to get through (glass) or distorts energy as it gets through (plastic, shower doors)
Term
 What is an object that absorbs light and casts a shadow?
Definition
 Opaque (wood or stone)
Term
 What are the color frequencies?
Definition
 Red, Orange, Yellow, Green, Blue, Violet
Term
 If 2 polarized light filters are over lapping at right angles, how much light is getting through?
Definition
 Little to no light
Term
 What can sound waves not travel through?
Definition
 A vaccuum
Term
 What is the term for the opposition to motion caused by air in aerodynamics?
Definition
 Air resistance
Term
 What is polarization?
Definition
 Waves that are transverse. (polarized glasses block out one direction of a polarized light wave)
Term
 The study of the properties of moving air, and especially of the interaction between the air and solid bodies moving through it is?
Definition
 Aerodynamics
Term
 The branch of science and technology concerned with the conveyance of liquids through pipes and channels, especially as a source of mechanical force or control is?
Definition
 Hydraulics
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