physics Flashcards

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1
Q

specific heat capacity

A
  • place a beaker on a balance and press zero
  • add the oil to the breaker and record the mass of the oil
  • place a thermometer and an immersion heater into the oil
  • read the starting temperature of the oil
  • wrap the beaker in insulating foam to reduce thermal energy transfer to the surroundings
  • connect a joulemeter to the immersion heater
  • time for thirty minutes
  • read the total number of joules of energy that passed into the immersion heater
  • read the final temperature of the oil
  • calculate the specific heat capacity
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2
Q

sources of inaccuracy for specific heat capacity

A
  • thermal energy passing out of the beaker into the air -> use an insulator with a lower thermal conductivity
  • not all thermal energy passing into the oil -> ensure that immersion heater is fully submerged
  • incorrect reading of thermometer -> use an electronic temperature probe
  • thermal energy not being spread through the oil - stir the oil
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3
Q

effectiveness of thermal insulators

A
  • place a small beaker inside a larger beaker
  • use a kettle to boil some water
  • transfer 80cm3 of the hot water into the small beaker
  • use a piece of cardboard as a lid for the large beaker
  • the lid must have a hole for a thermometer
  • next place a thermometer through the hole in the cardboard lid
  • the bulb of the thermometer must be in the hot water
  • record the starting temperature of the water and start a stopwatch
  • record the temperature of the water every 3 minutes for fifteen minutes
  • repeat the experiment using the same volume of hot water
  • use an insulating material to fill the gap between the two beakers
  • use the same mass for each insulating material
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