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 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

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?

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)

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.

Calculate the external work done on the gas

What is the distance between the plates?

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 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)

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

Calculate the mean translational kinetic energy of atoms in an ideal gas at 27℃. (Boltzmann constant, k =1.38 x 10^23 J/K)

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