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Review material for EASE 1 Grade 12 A level 2022
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An electron and a proton are 1.0 × 10–10 m apart. In the absence of any other charges, what is the electric potential energy of the electron?
–2.3 × 10^–18J
Two parallel plates, a distance 25 mm apart, have a potential difference between them of 12kV. Calculate the electric field strength between the plates
4.8x10^5 V/m
What is the distance between the plates?
5mm
What is the work done on a 10 kg mass when it is taken from P to Q?
+60J
A planet has gravitational potential Ï• at the surface -6.3 x 10^7 J/kg and the radius of the planet is 6.4 x 10^6 m. Calculate the mass of the Planet.
6.0 x 10^24 kg
A satellite is orbiting at a height above the ground equal to the radius of the Earth. The gravitational field strength, in N/kg, at this height is (mass of the earth = 6.0 x 10^24 kg; radius of the earth = 6371 km)
2.5N/kg
A car has a wheel with radius 30 cm. The wheel is rotating with angular speed of 4 rad/s. What is the tangential speed of the car?
1.2 m/s
A 0.10 kg solid rubber ball is swung in vertical circular motion attached to the end of an 0.80 m length of light thread. The speed of the ball is kept constant at 6.0 m/s throughout this experiment. Calculate the minimum tension
3.5N
What is the angular speed of a car of diameter 0.400 m when the speed of the car is 108km/h?
150 rad/s
A fairground roundabout makes nine revolutions in one minutes. What is the angular speed of the roundabout?
0.94 rad/s
Calculate the external work done on the gas
21J
A gas is heated by supplying it with 250kJ of energy. The gas is allowed to expand so that it does 200kJ of work on its surrounding. Calculate the change in the internal energy of the gas.
50kJ
A resistance thermometer has resistance 95.2 ohm at the ice point and 138.6 ohm at the steam point. What resistance would be obtained at a temperature of 19.4℃ on the centigrade scale of this resistance thermometer?
103.6 ohm
Calculate the mean translational kinetic energy of atoms in an ideal gas at 27℃. (Boltzmann constant, k =1.38 x 10^23 J/K)
6.21x10^25 J
Nitrogen consists of molecules N2. The molar mass of nitrogen is 28 g/mol. For 100 g of nitrogen, calculate the volume occupied at room temperature and pressure (20℃; 1.01 x 10^5 Pa). (universal molar gas constant, R, is 8.31 J/mol K) )
0.086 m^3
A bar gold-197 has a mass of 1.0 kg. Calculate the number of moles of gold in the bar. (An atom of gold contains 197 nucleons and has a mass of 197u. 1u is 1.66x10^-27kg. Avogadro constant, NA is 6.02 x 10^23 mol^-1)
5.1 mol
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