# Assessment Instructions: Problem Set 05 — Mass-Ratio Splitting and Tidal Effects at Europa

## Inputs to Inspect
Student submission, this problem set, the solution key, the corresponding lecture slides/notes, and the referenced dataset(s) under `materials/ASTR310/data/`.

## Grading Standard
Award credit for correct method and units first, then for the specific numeric result. A student who shows correct reasoning with a small arithmetic slip should receive most of the available credit; a student with a correct-looking number but no visible derivation steps should not. Because this is a 300-level quantitative course, full marks require a genuine derivation (not just formula substitution) wherever the problem set asks for one.

## Problem-Level Criteria
- Problem 1: 20 points — correct mass-ratio splitting arithmetic.
- Problem 2: 15 points — correct density and Roche-limit arithmetic.
- Problem 3: 20 points — correct tidal-acceleration arithmetic and correct ratio comparison to Io.
- Problem 4: 15 points — physically sound qualitative reasoning tied to the computed ratio, not a generic restatement of the lecture.

## Resubmission Policy
Students may resubmit within one week of receiving feedback. A resubmission must show a corrected derivation, not only a corrected final number, and should reference the specific feedback comment it addresses. Regrade to a maximum of 90% of the original point value unless the error was a grading mistake.

## Common Errors to Flag
- Confusing which moon (Io vs. Europa) has the larger tidal acceleration without checking the computed ratio.
- Computing Roche limit using Europa’s mass instead of Jupiter’s mass/density as the primary.
- Treating Problem 4 as requiring new calculation rather than qualitative reasoning from the already-computed Problem 3 ratio.