Homework hint: All problems in the text have answers at the back of the book! Some problems require just a written response, while others ask you to calculate something. Please write up all answers clearly, completely, and as succinctly as possible. You can work with others, but your final answers must be written up on your own.
Go to the Solar System
a) The Hellas impact basin on Mars is about 1800 km in diameter and about 6 km deep. Use the Collision Calculator with v=20 km/s to work out how large the impactor must have been if it was an asteroid (made of rock) or a comet (made of ice).
b) Use the rocky and icy impactors from part a) on the Earth and the Moon and compare the crater diameters and depths to the ones on Mars. Can you guess at the reason for the differences? Explain your answer.
Question 4. Once more, use the Solar System
The energy contained in the motion of an
object of mass m moving at speed v is m*v2/2. In this problem, you
will test how well this formula fits the energy released a high speed
impact with Earth.
a) Go back to the table that you created in HW#1. How much does the impact energy increase for each factor of ten increase in diameter? Is this consistent with the formula? Why or why not?
b) Now run several simulations for a 1km object hitting Earth at different velocities: 15, 30 and 60 km/s. Record the impact energies and show how well they match the predictions of the equation. Use ratios as you did in problem 1 of HW#2.
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