Physics 211, Homework Set #3

These problems are due Monday, Mar 29, at 5 PM. You may place your solutions in the mailbox outside my office door, or bring them into class.

The grading scheme for the homework set is as follows: three of the problems will be chosen to count for 10 points, and you may be given partial credit on them. You will receive 1 point for at least attempting each of the other questions. However, you do not know which of the questions will be chosen for detailed grading ... and therefore you should do them all.

1. Cutnell and Johnson, Chap 3, problem 3
2. Cutnell and Johnson, Chap 3, problem 8
3. Cutnell and Johnson, Chap 3, problem 20
4. Cutnell and Johnson, Chap 3, problem 27
5. Cutnell and Johnson, Chap 3, problem 40
6. Cutnell and Johnson, Chap 3, problem 47
7. Cutnell and Johnson, Chap 3, problem 53
8. Cutnell and Johnson, Chap 3, problem 63

9. In World War I, the German army developed a set of very large artillary pieces, nicknamed "Paris Guns." These guns achieved a muzzle velocity of 1700 m/s, and were typically fired at an angle of 55 degrees above the horizontal.

   a) What was the range of these guns (neglecting air resistance)?

   The guns were first used on March 23, 1918, a few days after the German army launched its last great offensive on the Western front. Three of the guns were located in Crepy-en-Laonnoise (about 8 km west-north-west of Laon), just behind the German lines. They were able to shell Paris, killing a number of civilians.

   b) What is the distance from Crepy-en-Laonnoise to Paris? How does this compare with the range you derived for the gun? If there is a difference, explain why the Germans might have placed the gun at Crepy.

   c) If the Germans had wanted to shell London from the same spot in Crepy, what muzzle velocity would the shells have needed?

This page maintained by Michael Richmond. Last modified Mar 8, 1999.