In 2014, the rosetta space probe reached the comet churyumov gerasimenko. although the comet's core is actually far from spherical, in this problem we'll model it as a sphere with a mass of 1.0 × 1013 kg and a radius of 1.6 km. if a rock were dropped from a height of 1.0 m above the comet's surface, how long would it take to hit the surface?

To solve this problem we will apply the concepts related to gravity according to the Newtonian definitions. From finding this value we will use the linear motion kinematic equations to find the time. Our values are

Comet mass

Radius

Rock was dropped from a height 'h' from surface = 1m

The relation for acceleration due to gravity of a body of mass 'm' with radius 'r' is

Where G means gravitational universal constant and M the mass of the planet

Now calculate the value of the time

The time taken for the rock to reach the surface is t = 87.58s

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

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