Answering
- Open a problem from Problems, a tag page or a note.
- Work it out on paper first - draw the free-body diagram, write the equations.
- Type your results into the answer fields. Mind the units shown next to each field.
- Check your answer. You see at once whether it is within the accepted tolerance.
Correct
Your value is within the tolerance of the expected answer.
Not yet
Check units, signs and rounding, then try again.
Solution
Open the step-by-step solution after trying.
The solution
After trying, you can open the solution. Compare it with your own working: the steps matter more than the final number.
Statistics
Each problem shows how many people tried it, how many solved it and how many solved it at the first try. If nobody has tried yet, you can be the first.
Signed-in members earn points for attempts, for solving and an extra bonus for solving at the first try (not on their own problems).
