Physics 1121 Quiz 1 (Part 5) Flashcards
Conduction
heat movement via transfer of kinetic energy among individual atoms.
Convection
heat transfer via a moving medium (air or fluid).
Radiation
heat transfer via emission of electromagnetic radiation (infra-red and microwave).
Electrical Energy
Energy that is possessed by an electrical charge or current.
Nuclear energy
energy that is found in the nucleus of an atom.
Electromagnetic energy
Energy that travels as disturbances in electrical and magnetic fields such as light, x-rays, radio, etc.
Power
The rate at which work is performed or work/time.
W=Fd (F must be parallel)
P=W/t
1000 W = 1 kW
English unit of power
is the horsepower (the ability of a hypothetical horse to lift 330 lbs, 100 ft in 1 minute.
1 hp = 550 ft-lb/s or 746 W
Law of Conservation of Energy
Energy is neither created nor destroyed, but just exchanged from one form into another, including matter.
Constant
Transducer
any device that converts one form of energy into another.
Efficiency Formula
Efficiency = Output energy (work)/input energy (work) x 100
Mass Density
most often used in metric system.
It is the mass per unit volume or mass/volume.
Units are kg/m3 in the MKS and SI branches and g/cm3 in the CGS branch.
Weight Density
Density is defined as the weight per unit volume and is more commonly used in the English system.
Weight Density = weight/volume
Units are either lbs/ft3 or lbs/in3
Specific Gravity
Defined as the ratio of the density of a material to that of water in equal amounts.
It is often used to measure the density of liquids.
G=p/pw
pw= density of water
Velocity
Defined as the speed in a given direction (vector quantity).
Speed = distance/time
