Welcome to the Quiz!

This quiz contains 5 questions from a mix of 1 subtopics.

Calculate the gravitational potential at a point 20,000 km away from the centre of a planet with a mass of 4 x 1024 kg. Use the gravitational constant G = 6.67 x 10-11 N m2 kg-2.

-66.7 MJ kg-1

-200 MJ kg-1

-13.34 MJ kg-1

-3.35 kJ kg-1

0

/

1

Calculate the gravitational potential energy of a 200 kg object located 500 km above the surface of a planet. The planet's mass is 6 x 1024 kg and its radius is 5,000 km. Use G = 6.67 x 10-11 N m2 kg-2.

-6.40 x 1010 J

-4.80 x 1010 J

-1.46 x 1010 J

-1.60 x 1010 J

0

/

1

Calculate the work done to move a 50 kg object through a gravitational potential difference of 5 J kg-1.

250 J

100 J

150 J

200 J

0

/

1

Calculate the escape velocity from a planet's surface, given that the planet's mass is 7 x 1024 kg and its radius is 6,000 km.

Use G = 6.67 x 10-11 N m2 kg-2^.

10.2 km s-1

11.4 km s-1

12.5 km s-1

13.8 km s-1

0

/

1

What is the work done in moving a 10 kg mass from a point with gravitational potential -20 J kg-1 to another point with gravitational potential -15 J kg-1?

200 J

50 J

-50 J

-200 J

0

/

1