What are the permissions of this file? (See “File Permissions and Access Control” in Lab 0.)

Question

Note: The expected answer should look like: -rwxrwxrwx, where the absent permissions are replaced with “-”.

Answer 1

Without the specific file mentioned, it is not possible to determine the permissions of the file or provide a complete answer. The expected answer should include 10 characters representing the file permissions in the form "-rwxrwxrwx", with the first character representing the file type and the remaining nine characters representing the user, group, and others' permissions.

Answer 2

A man is walking away from a lamppost with a light source h = 8 m above the ground. The man is m = 2 m tall. How long is the man's shadow when he is d = 15 m from the lamppost? [Hint: Use similar triangles.]
m

Answer 3

To solve this problem, we can use similar triangles.

Let's say the length of the man's shadow is x.

We have two similar triangles: one formed by the man, his shadow, and the ground, and the other formed by the lamppost, the man's shadow, and the ground.

In the first triangle, the height of the man is the vertical side, and the length of his shadow is the horizontal side.

In the second triangle, the height of the lamppost is the vertical side, and the length of the man's shadow is the horizontal side.

Since the two triangles are similar, we can set up the following proportion:

(man's height) / (man's shadow length) = (lamppost height) / (man's shadow length + shadow length)

Plugging in the given values:

2 / x = 8 / (x + 15)

Now, we can solve for x by cross-multiplying:

2(x + 15) = 8x

2x + 30 = 8x

30 = 6x

x = 30 / 6

x = 5

Therefore, the length of the man's shadow is 5 meters when he is 15 meters away from the lamppost.