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Situation: You are asked by your mother to cook pork nilaga. You have only an ordinary kettle to use for cooking. She even reminds you to save energy because we are in a state of pandemic due to covid-19. Saving resources nowadays is a must because we are not sure of the world’s economy. As a student of Physical Science and with your knowledge of properties of matter in relation to intermolecular forces, how are you going to perform your task in such a way that energy is not wasted?
A tank used for filling helium balloons has a volume of 0.600 m³ and contains 3.00 mol of helium gas at 30.0ºC. Assume the helium behaves like an ideal gas
A 5.0 ng particle of pure carbon has a net charge of +12 µC.
What fraction of electrons on this particle of carbon have been removed? ( give your answer as a decimal number to 2 s.f)
[note: MC = 12 g mol−1 and one neutral atom of carbon has 6 protons and 6 electrons.]
What is the total thermal energy of 1 mol of an ideal monatomic gas at a temperature of 0°C? (to 2 s.f and in J)
You are wearing a nice jersey that is 4.0 mm thick and is made of a material with thermal conductivity of 0.055 W m−1 K−1.
The inside surface of the jersey is at the same temperature as your skin, 26°C. The outside surface of the jersey is at a temperature of just 8.0°C.
If the jersey has a total surface area of 0.25 m2 then at what rate is heat being lost through the jersey? (to 2 s.f and in W)
How much heat is required to turn 1.5 kg of water at a temperature of 5°C into 1.5 kg of water vapour at 150°C? (to 2 s.f and in MJ)
[cwater = 4190 J kg−1 K−1, cwater-vapour = 2010 J kg−1 K−1, Lvap-water = 2256×103 J kg−1]
Which wave property has the same value for all x rays travelling in the air
A small probe is made of stainless steel and has a length of 60 mm when it stored at a temperature of 18°C.
What is the change in length of the probe when it is being used in an operation and it has warmed up to 36°C? (to 2 s.f and in mm)
[αsteel = 16.0×10−6 K−1]
A solid of mass 200g is heated to a temperature of 80 degree Celsius and is found to melt just 40g of ice. Specific latent heat of ice = 3.36*10^6 J kg-1 K-1 , calculate specific heat capacity of solid.
1) A 40-m vertical column of fluid with density of 1872 kg/m3 is located where g = 9.65 g/m2. Find the pressure at the base of the column.
2) Two liquids of different densities (ρ1 = 1500 kg/m3 , ρ2 = 500 kg/m3) are poured together into a 120-liter tank, filling it. If the resulting density of the mixture is 820 kg/m3, find the respective amounts of liquids used. Also find the weight of the mixture; local g= 9.675 m/s2.
3) If a pump discharges 284 liters per minute of water whose density is 985 kg/m3, find (a)the mass flow rate in kg/min, (b) the total time required to fill a vertical tank 3 m in diameter and 4 m high.
6)Fahrenheit and a Celsius thermometer are both immersed in a fluid and indicate identical numerical readings. What is the temperature of the fluid expressed as °R and as °K?
