physics practicals

physics practicals

1. vaccum

   • a space that contains no matter
   • specific latent heat fusion
     • heat = energy change/ mass
       • 1) heat ice in funnel measure mass in beaker
         • 2) rule energy using joulemeter (Ene change)
           • 3) use formula
     • of vapourisation
       • SLH = ene change/ change in mass
         • 1) rule mass of agua in a beaker
           • 2) boil agua y luego rule again
             • 3) mass at start- mass at end
               • 4) rule ene by heater using j meter
                 • 5) use formula

2. Resistance

   • a rule of how dificil it is for current to flow thru a component
     • size affected by 2 cosas:
       • 1)resistance: if R is + current will -
         • 2)PD if PD is + current will +
   • rule in ohms
     • R = V/I
       • v = PD
   • to rule across components
     • measure PD
       • use ammeter to rule current
     • the longer the wire, the + the R
       • in series circuits resistors oppose flow of electric current
         • total = resistances added juntos individually
           • in parallel 2 resistors is less than resistances of either of resistors themselves
             • parallel circuit is

3. Density

   • + mass will + density
   • a rule of how concentrated an obj mass is
     • to calculate density of liquid 2 things:
       • 1) get ruling cylinder on balance set reading to 0
         • 2)pour liquid into cylinder y write down mass and vol
           • 3) use formula for density
       • to calculate density of solid 5 things:
         • 1) rule mass of solid using balance
           • 2) fill displace can con agua
             • 3)lower solid into can y make agua overflow into cylinder
               • 4) rule vol of agua that overflows = vol of obj
                 • 5) use formula to find density
   • the force that keeps an obj afloat is called upthrust
   • an obj will float is density is lower than the density of the liquid
   • the law of displacement says an obj submerged in fluid will replace an amt of fluid = to its vol