Gravitational fields

The definition of gravitational field strength is:

• The region of space surrounding a body where other bodies will feel an attractive force due to it.
• The region of space surrounding a body where other bodies will feel an repulsive force due to it.
• The region of space surrounding a charge where other charges will feel an attractive force due to it.
• The region of space surrounding a charge where other charges will feel an repulsive force due to it.

Tags

NGSS.HS-PS2-4

The closer together the gravitational field lines.....

• the weaker the gravitational field strength
• the stronger the gravitational field strength
• the more repulsive the gravitational field strength

Tags

NGSS.HS-PS2-4

How far out from a mass should the gravitational field lines go....

• to where the gravitational field becomes negligable
• to twice the diameter of the mass
• infinitely far
• to four times the diameter of the mass

Tags

NGSS.HS-PS2-4

In this equation...

• G is the gravitational field strength
• r is the distance between the 2 masses
• F is the repulsive gravitational force
• m is the momentum of the mass

Tags

NGSS.HS-PS2-4

A geostationary satellite orbits the Earth....

• once every 24 hours
• once every 10-11 hours
• once every week
• once every 4 weeks

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

Gravitational potential at a point is....

• the work done in bringing a unit mass from infinity to the point
• the work done in bringing a unit mass from the point to infinity
• the work done in bringing a unit charge from infinity to the point
• the work done in bringing a unit mass from twice the radius of the mass to the point

Tags

NGSS.HS-PS2-4

The minimum velocity required to leave the atmosphere is called the...

• orbital velocity
• ejection velocity
• terminal velocity
• escape velocity

What force acts on a satellite?

• centrifugal force
• centripetal force
• tangential force
• ^{balanced force}

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

An object is moved from A to B in the gravitational field of Earth. The distance between the centre of Earth and B is twice that of A. If the gravitational potential energy of the object at A is –2.0 MJ, what is the gravitational potential energy of the object at B?

• zero
• -0.5MJ
• -1.0MJ
• -4.0MJ

A satellite of mass m is in a circular orbit of radius R around Earth. The time required to complete one revolution is T. What would be the kinetic energy of the satellite?

• GMm/R
• GMm/2R
• mR/T
• 2m(R/T)²

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1