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1. Impurities
2. Pressure
johnmulu answered the question on February 18, 2017 at 05:05
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Define specific latent heat of fusion of a substance.
Date posted: February 18, 2017. Answers (1)
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Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
Date posted: February 15, 2017. Answers (1)
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State what is meant by the term 'Specific latent heat of vaporazation'.
Date posted: February 15, 2017. Answers (1)
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State two factors that would raise the boiling point of water to above 100oC
Date posted: February 15, 2017. Answers (1)
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Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. State two factors, other than humidity, that determine the final temperature.
Date posted: February 15, 2017. Answers (1)
- Ice changes to water at 0oC. Equal masses of the ice and water at 0oC are each heated to 1oC. Give a reason why more heat energy is required to heat the ice(Solved)
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Date posted: February 15, 2017. Answers (1)
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Describe the experiment to determine the specific heat capacity, c, of a block of aluminium with two holes drilled in it, to accommodate a thermometer and an electric immersion heater.
Date posted: February 15, 2017. Answers (1)
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Distinguish between heat capacity and specific heat capacity of a body.
Date posted: February 15, 2017. Answers (1)
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A 4 ohm resistor is connected in series to a battery of e.m.f. 6 V and negligible internal resistance. Determine the power dissipated by the resistor.
Date posted: February 15, 2017. Answers (1)
- A current I flowing through a wire of resistance R was increased seven times. Determine the factor by which the rate of heat production was increased.(Solved)
A current I flowing through a wire of resistance R was increased seven times. Determine the factor by which the rate of heat production was increased.
Date posted: February 15, 2017. Answers (1)
- A heating coil is rated 100 W, 240 V. At what rate would it dissipate energy it is connected to a 220 V supply(Solved)
A heating coil is rated 100 W, 240 V. At what rate would it dissipate energy it is connected to a 220 V supply
Date posted: February 15, 2017. Answers (1)
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A hair drier is rated 2500W, 240V. Determine its resistance
Date posted: February 15, 2017. Answers (1)
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An electric heater is connected to the mains supply. A fault in the mains reduces the supply potential slightly. Explain the effect on the rate of heating of the heater.
Date posted: February 15, 2017. Answers (1)
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An electric bulb is rated 75W, 240V. Determine the resistance of the bulb
Date posted: February 15, 2017. Answers (1)
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An electric bulb with a filament of resistance 480 ohms is connected to a 240 V mains supply. Determine the energy dissipated in 2 minutes
Date posted: February 15, 2017. Answers (1)
- A 60 W bulb is used continuously for 36 hours. Determine the energy consumed. Give your answer in kilowatt hour (kWh)(Solved)
A 60 W bulb is used continuously for 36 hours. Determine the energy consumed. Give your answer in kilowatt hour (kWh)
Date posted: February 15, 2017. Answers (1)
- An electric heater rated 240 V, 3000 W is to be connected to a 240 V mains supply, through a 10 A fuse.Determine whether the fuse is suitable or not(Solved)
An electric heater rated 240 V, 3000 W is to be connected to a 240 V mains supply, through a 10 A fuse. Determine whether the fuse is suitable or not
Date posted: February 15, 2017. Answers (1)
- When a current of 2.0 A flows in resistor for 10 minutes, 15, 000 joules of electrical energy is dissipated. Determine the voltage across the resistor(Solved)
When a current of 2.0 A flows in resistor for 10 minutes, 15, 000 joules of electrical energy is dissipated. Determine the voltage across the resistor.
Date posted: February 15, 2017. Answers (1)
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State three factors that affect the capacitance of a parallel plate capacitor
Date posted: February 15, 2017. Answers (1)
- State the effect of decreasing the distance between the plates of a parallel plate capacitor on the capacitance(Solved)
State the effect of decreasing the distance between the plates of a parallel plate capacitor on the capacitance.
Date posted: February 15, 2017. Answers (1)