A planet has half the mass and half the radius of the Earth. What is the gravitational field strength at the surface of the planet? The gravitational field strength at the surface of the Earth is .
The gravitational field strength at a point X in a gravitational field is defined as the force
A satellite of mass orbits the Earth with a period . What will be the orbital period of satellite of mass occupying the same orbit as ?
The centres of two isolated spherical stars each of mass and radius are separated by a distance as shown in the diagram below.
The distance is very large compared to . Point X is mid-way between the stars. The gravitational potential at point X due to the two stars is
An ion follows a circular path in a uniform magnetic field. Which single change decreases the radius of the path?
A projectile is fired from level ground with speed at an angle to the ground. Ignoring air resistance, which of the following is a correct expression for the maximum height reached by the projectile?
A projectile is fired horizontally from the top of a cliff. The projectile hits the ground 4 s later at a distance of 2 km from the base of the cliff. What is the height of the cliff?
A stone is thrown at an angle to the horizontal. Ignoring air resistance, the horizontal component of the initial velocity of the stone determines the value of
A communications satellite is moving at a constant speed in a circular orbit around Earth. At any given instant in time, the resultant force on the satellite is
A motorcyclist is cornering on a curved race track.
Which combination of changes of banking angle and coefficient of friction between the tyres and road allows the motorcyclist to travel around the corner at greater speed?