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.

Two parallel plates, a distance 25 mm apart, have a potential difference between them of 12kV. Calculate the electric field strength between the plates

A planet has gravitational potential ϕ 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.

A fairground roundabout makes nine revolutions in one minutes. What is the angular speed of the roundabout?

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)

What is the angular speed of a car of diameter 0.400 m when the speed of the car is 108km/h?

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?

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

What is the distance between the plates?

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)

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?

What is the work done on a 10 kg mass when it is taken from P to Q?

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?